vehicle time headways and spacings were measured at a point along a highway, from a single lane, over the course of an hour. the average values were calculated as 2.5 s/veh for headway and 200 ft/veh for spacing. calculate the average speed of the traffic. 26

Answers

Answer 1

The average speed of vehicles on the highway, based on the given measurements, is approximately 80.48 miles per hour.

The average speed of vehicles on the highway can be calculated using the relationship between speed, time headway, and spacing. Specifically, we can use the formula:

Average speed = (Spacing ÷ Time headway) x 3600 ÷ 5280

Where 3600 is the number of seconds in an hour and 5280 is the number of feet in a mile.

Average time headway = 2.5 seconds per vehicle

Average spacing = 200 feet per vehicle

Plugging in the given values of time headway and spacing, we get:

Average speed = (200 ÷ 2.5) x 3600 ÷ 5280

= 80.48 mph (rounded to two decimal places)

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The complete question is:

Vehicle time headways and spacings were measured at a point along a highway, from a single lane over the course of an hour. The average values were calculated as 2.5 sec/veh for headway and 200 ft/veh for spacing. What was the average speed?


Related Questions

fish are hung on a spring scale to determine their mass (most fishermen feel no obligation to truthfully report the mass). what is the force constant of the spring in such a scale if it the spring stretches 8.30 cm for a 12.5 kg load?

Answers

The force constant of the spring in such a scale if it the spring stretches 8.30 cm for a 12.5 kg load would be 1479.28N.

To determine the force constant of the spring in the fisherman's scale, we can use Hooke's law, which states that the force applied to a spring is directly proportional to the amount it is stretched.

The formula for Hooke's law is F = -kx, where F is the force applied, k is the force constant of the spring, and x is the displacement of the spring from its equilibrium position.

In this case, we know that the spring stretches 8.30 cm (or 0.0830 m) for a load of 12.5 kg.

We can convert this to force using the formula

F = mg, where m is the mass of the object and g is the acceleration due to gravity[tex](9.81 m/s^2).[/tex]

Therefore,[tex]F = (12.5 kg)(9.81 m/s^2) = 122.63 N[/tex].

Using Hooke's law, we can rearrange the equation to solve for k:

k = -F/x.

Plugging in the values we have, we get

k = -(122.63 N)/(0.0830 m) = -1479.28 N/m.

Therefore, the force constant of the spring in the fisherman's scale is approximately 1479.28 N/m.

This means that for every 1 meter the spring is stretched, it will apply a force of 1479.28 N.

It's important to note that fishermen may not always report the mass accurately, but the force applied to the spring will still be proportional to the true mass.

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an airliner passes over an airport at noon traveling 530 mi/hr due east, at 1:00 pm, another airliner passes over the same airport at the same elevation traveling due south at 580 mi/hr. assuming both airliners maintain their (equal) elevation, how fast is the distance between them changing at 3:00 pm.

Answers

The rate of change of the distance between the two airliners at 3:00 pm is 720 mph.

How to find the rate of change of the distance between two airliners?

We can use the Pythagorean theorem to determine the distance between the two airliners at any time t, and then differentiate the equation with respect to time to find how fast the distance is changing.

Let d be the distance between the two airliners, and let x and y be the distances traveled by the first and second airliners respectively, from their respective starting points. Then, we have:

d² = x² + y²

Differentiating both sides with respect to time, we get:

2d(dd/dt) = 2x(dx/dt) + 2y(dy/dt)

At 3:00 pm, the first airliner has traveled for 3 hours, covering a distance of 1590 miles (530 miles/hr * 3 hours) due east from the airport. Similarly, the second airliner has traveled for 2 hours, covering a distance of 1160 miles (580 miles/hr * 2 hours) due south from the airport.

Substituting these values, we get:

d² = (1590)² + (1160)²

d = √[(1590)² + (1160)²] = 1934 miles (approx.)

Differentiating with respect to time, we have:

2d(dd/dt) = 2(1590)(530) + 2(1160)(-580)

Simplifying, we get:

dd/dt = [-1590(530) + 1160(580)] / 1934

dd/dt = -48.5 mph (approx.)

Therefore, the distance between the two airliners is decreasing at a rate of approximately 48.5 mph at 3:00 pm.

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Which describes an effect of recycling?

A
Recycling decreases land usage.

B
Recycling increases pollution.

C
Recycling stops land from being used.

D
Recycling increases land usage.

Answers

Answer: A

Explanation:

a 409-kg satellite is in circular orbit around the earth and moving at a speed of 1.29 km/s. how much work must be done to move the satellite into another circular orbit that is twice as high above the surface of the earth?

Answers

To move the satellite into another circular orbit, we need to change its velocity. The amount of work required can be calculated using the formula:

Work
= (1/2) x mass x (final velocity^2 - initial velocity^2)

Here, the initial velocity is 1.29 km/s, and the mass of the satellite is 409 kg. Let's assume that we want to move the satellite into a higher circular orbit with a velocity of 1.5 km/s.

Work = (1/2) x 409 kg x (1.5 km/s)^2 - (1.29 km/s)^2)
Work = (1/2) x 409 kg x (2.25 km^2/s^2 - 1.6641 km^2/s^2)
Work = (1/2) x 409 kg x 0.5859 km^2/s^2
Work = 119.96 kJ

Therefore, we need to do approximately 119.96 kJ of work to move the satellite into another circular orbit with a velocity of 1.5 km/s.

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13. what type of lens is used to make a magnifying glass? a) converging b) diverging c) either type would work equally well.

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Option (a).

A converging lens is used to make a magnifying glass, which works by bending light to create a magnified image.

The curved surface of the lens helps to focus and magnify the object being viewed.

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the energy gap is about 8 kilocalories per pound of lost weight. bill has just lost 25 pounds, so he needs __________ fewer kilocalories per day to maintain his weight loss.

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The energy gap is about 8 kilocalories per pound of lost weight. bill has just lost 25 pounds, so he needs 200 fewer kilocalories per day to maintain his weight loss.

When someone loses weight, their body requires fewer calories to maintain their new weight. This is because the body has less mass to maintain, and therefore requires less energy to do so.

The amount of energy saved per pound of weight loss is referred to as the energy gap. In this case, the energy gap is 8 kilocalories per pound of lost weight. This means that for every pound of weight lost, the body requires 8 fewer kilocalories per day to maintain that weight loss.

If Bill has just lost 25 pounds, then he would need to consume 8 x 25 = 200 fewer kilocalories per day to maintain his weight loss compared to what he needed before his weight loss.

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11. the uncertainty in the position of an electron along an x axis is given as 50 pm, which is about equal to the radius of a hydrogen atom. what is the least uncertainty in any simultaneous measurement of the momentum component px of this electron?

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According to Heisenberg's uncertainty principle, the product of the uncertainties in position and momentum of a particle along a given axis must be greater than or equal to Planck's constant divided by 4π.

Therefore, the minimum uncertainty in the momentum component px of the electron can be calculated by dividing Planck's constant by twice the uncertainty in position along the x axis. This gives a minimum uncertainty in momentum of approximately 1.05 × 10^-24 kg·m/s. The uncertainty in position of the electron is relatively large, which results in a correspondingly large minimum uncertainty in momentum. This uncertainty in momentum implies that the electron's motion cannot be precisely predicted or determined, which is a fundamental characteristic of quantum mechanics.

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social cognition and third wave cognitive frames

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Social cognition refers to how individuals perceive, process, and use information about other people and social situations.

Third wave cognitive frames refer to newer approaches in cognitive psychology that focus on the context in which thoughts and emotions arise, rather than simply examining them in isolation.

Here is a step-by-step explanation of how social cognition and third wave cognitive frames are related:

1) Social cognition is a broad field that encompasses various cognitive processes involved in social interaction, such as perception, attention, memory, and decision-making.

2) One of the key areas of research in social cognition is the study of social schemas, which are mental structures that help individuals organize and interpret information about social situations and people.

3) Third wave cognitive frames build on social cognition research by emphasizing the importance of context in shaping cognitive processes.

This includes considering factors such as cultural norms, personal values, and social relationships.

4) Third wave cognitive frames also highlight the role of emotions and mindfulness in cognitive processing.

For example, mindfulness practices can help individuals become more aware of their thoughts and feelings, which can in turn enhance their social cognition abilities.

6) Another aspect of third wave cognitive frames is the concept of cognitive fusion, which refers to the tendency for individuals to identify with their thoughts and emotions, rather than seeing them as transient experiences.

By practicing cognitive defusion techniques, individuals can learn to distance themselves from their thoughts and emotions, and become more flexible in their social interactions.

7) Overall, the integration of social cognition and third wave cognitive frames highlights the complex interplay between cognitive processes, emotions, and social contexts.

By taking a more holistic approach to studying cognition, researchers and practitioners can develop more effective interventions to enhance social cognition and improve social functioning.

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A cylindrical beaker of mass 50kg, cross sectional area 25cm3 and height 10cm is filled with oil of density 0.8g/cm3.(i):what is the total mass. (ii) A piece of aluminum of mass 66g and density 2.2g/cm3, is lowered carefully into the beaker. What volume of oil overflows?. (iii) What is the final mass of the beaker and its contents after the outside has been wipe to remove overflow liquid?​

Answers

Answer:

(i) The volume of the cylindrical beaker is given by:

V = A x h = (25 cm^2) x (10 cm) = 250 cm^3

The mass of the oil in the beaker is given by:

m_oil = density x volume = (0.8 g/cm^3) x (250 cm^3) = 200 g

The total mass of the beaker and oil is therefore:

m_total = m_beaker + m_oil = 50 kg + 0.2 kg = 50.2 kg

(ii) The volume of the aluminum is given by:

V_aluminum = m_aluminum / density = 66 g / (2.2 g/cm^3) = 30 cm^3

When the aluminum is lowered into the beaker, it displaces an equal volume of oil. Therefore, the volume of oil that overflows is 30 cm^3.

(iii) The final mass of the beaker and its contents is the sum of the mass of the beaker, the mass of the oil remaining in the beaker, and the mass of the aluminum:

m_final = m_beaker + m_oil + m_aluminum = 50 kg + 0.17 kg + 0.066 kg = 50.24 kg

To calculate the mass of the remaining oil, we need to subtract the volume of aluminum from the volume of the beaker and multiply by the density of the oil:

V_remaining_oil = (A x h) - V_aluminum = (25 cm^2 x 10 cm) - 30 cm^3 = 220 cm^3

m_remaining_oil = density x V_remaining_oil = 0.8 g/cm^3 x 220 cm^3 = 176 g

Therefore, the final mass of the beaker and its contents after the overflow liquid has been wiped off is 50.24 kg, and there is 176 g of oil remaining in the beaker

a woodchuck runs 19 m to the right in 4.8 s, then turns and runs 12 m to the left in 5 s. Part (a) What is the magnitude of the average velocity of the woodchuck in m/s?
v=____. PART B What is its average speed in m/s?

Answers

The magnitude of the average velocity of the woodchuck is 0.71 m/s. The average speed of the woodchuck is 3.2 m/s.

Right distance = 19m

Time is taken to cover distance = 4.8s

Left distance = 12m

Time is taken to cover distance = 5s

total displacement = 19 m to the right - 12 m to the left = 7 m to the right

A. To calculate the magnitude of the average velocity, we need to find the total displacement and divide it by the total time.

The total time it took for the woodchuck to run both distances is:

The total time = 4.8 s + 5 s

The total time = 9.8 s

The magnitude of the average velocity is:

v = displacement/time

v  = 7 m / 9.8 s

v = 0.71 m/s

B. To find the average speed, we need to calculate the total distance traveled and divide it by the total time.

The total distance traveled is = 19 m + 12 m = 31 m

The total time it took for the woodchuck to run both distances is:

The average speed = total distance / total time

The average speed = 31 m / 9.8 s = 3.2 m/s

Therefore we can conclude that the magnitude of the average velocity is 0.71 m/s and the average speed is 3.2 m/s.

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why should ay be close to 9.8 m/s2, with the other two being close to 0? why should all three gyroscope values be essentially 0?

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The values you mentioned are related to the motion of a typical object near the surface of the Earth.

The acceleration due to gravity, represented by "g", is approximately 9.8 [tex]m/s^2[/tex] at sea level. This value is constant and acts vertically downward, so it's common to see it represented as a negative value in equations. If an object is at rest on a level surface, then its acceleration in the x and y directions should be close to zero. This is because the object is not moving in those directions, so it's not accelerating.

Regarding the gyroscope values, a gyroscope is a device that measures angular velocity or rotation rate. If a gyroscope is at rest or is not undergoing any rotation, its output should be zero. This is because there is no change in angular velocity to measure. So, if all three gyroscope values are essentially zero, it suggests that the device is not rotating or undergoing any significant angular velocity changes.

In summary, the values you mentioned are related to the motion of objects on or near the Earth's surface, and their values reflect the physical laws that govern that motion.

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18. how long does the eclipse of an earth-like planet take? how much time passes between eclipses? what obstacles would a ground-based mission to detect earth-like planets face?

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The duration and frequency of eclipses on an Earth-like planet depend on its orbit and the orbit of its moon(s).

However, on average, a total solar eclipse could last for a few minutes to a few hours, and the time between eclipses could be a few months to a few years. Obstacles for the ground-based detection of the Earth-like planets include atmospheric interference, limited resolution, and the brightness of the host star relative to the planet. Additionally, Earth-like planets are often located far away and are small compared to their host stars, making them challenging to detect using the current technology.

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a 60 g ball is tied to the end of a 50-cm-long string and swung in a vertical circle. the center of the circle, as shown in figure p8.57, is 150 cm above the floor. the ball is swung at the minimum speed necessary to make it over the top without the string going slack. if the string is released at the instant the ball is at the top of the loop, how far to the right does the ball hit the ground?

Answers

The vertical distance the ball needs to cover is h = 0.5

A 60 g ball is tied to a 50 cm long string and swung in a vertical circle with a center 150 cm above the floor. To prevent the string from going slack at the top, the ball's speed must be such that the gravitational force equals the centripetal force.

In this case, mg = mv²/r, where m is the mass, g is the gravitational acceleration, v is the speed, and r is the radius of the circle.When the string is released at the top, the ball becomes a projectile with an initial horizontal velocity equal to its tangential velocity at the top of the loop.

The vertical distance the ball needs to cover is 150 cm - 50 cm = 100 cm. Using the formula h = 0.5 * g * t², we can find the time, t, it takes for the ball to hit the ground.

After finding t, we can calculate the horizontal distance traveled using the formula x = vt, where x is the horizontal distance and v is the initial horizontal velocity. This will give us the distance to the right where the ball hits the ground.

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Note the full question is

a 60 g ball is tied to the end of a 50-cm-long string and swung in a vertical circle. the center of the circle, as shown in figure p8.57, is 150 cm above the floor. the ball is swung at the minimum speed necessary to make it over the top without the string going slack. if the string is released at the instant the ball is at the top of the loop, how far to the right does the ball hit the ground?

22. radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted. why is this? a) radio waves are unpolarized, whereas light is normally polarized. b) the wavelength of light is much smaller than the wavelength of radio waves. c) the wavelength of light is much greater than the wavelength of radio waves. d) radio waves are coherent and light is usually not coherent. e) radio waves are polarized, whereas light is usually unpolarized.

Answers

Radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted, because b) the wavelength of light is much smaller than the wavelength of radio waves.

The diffraction is the bending of waves around obstacles or through small openings, and the amount of diffraction is proportional to the size of the obstacle or opening and the wavelength of the wave. Since radio waves have much longer wavelengths than visible light, they are more easily diffracted by large objects such as buildings. On the other hand, visible light has a much smaller wavelength than radio waves, which makes it less prone to diffraction. Polarization and coherence are not directly related to diffraction.

Polarization refers to the direction of oscillation of the electromagnetic waves, while coherence refers to the consistency of phase between waves. Therefore, the correct answer is b) the wavelength of light is much smaller than the wavelength of radio waves. Radio waves are diffracted by large objects such as buildings, whereas light is not noticeably diffracted, because b) the wavelength of light is much smaller than the wavelength of radio waves.

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A train car with a mass of 2000 kg is traveling east at 10 m/s. It is approaching another train car with a mass of 1000 kg also traveling east at 3 m/s. After the trains collide, the more massive train car continues east at 6 m/s. What is the new velocity of the less massive train car?

Answers

The new velocity of the less massive train car has a velocity of 10 m/s after the collision.

What is velocity?

Velocity is a measure of the rate and direction of an object's motion. It is a vector quantity, meaning it has both magnitude and direction. Velocity is typically represented by the equation v = s/t, where v is the velocity, s is the displacement (or distance travelled), and t is the time taken. Velocity is often confused with speed, which is the measure of the magnitude of an object's motion. Speed is a scalar quantity and is represented by the equation s = t/v.

The total momentum of the two train cars before the collision is calculated by multiplying the mass of each car by its velocity.

The total momentum of the system before the collision is 2000 kg x 10 m/s + 1000 kg x 3 m/s = 23000 kg m/s.

The total momentum of the system after the collision is 2000 kg x 6 m/s + 1000 kg x v, where v is the velocity of the less massive train car after the collision.

Therefore, we can set up the equation 23000 = 12000 + 1000v and solve for v.

v = 10 m/s.

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if successful, leibnez's argument proves the existence of a necessary, uncaused, timeless, spaceless, immaterial, personal creator of the universe. true or false?

Answers

If successful, Leibniz's argument, also known as the Cosmological Argument, does aim to prove the existence of a necessary, uncaused, timeless, spaceless, immaterial, personal creator of the universe. The statement is true.

Leibniz's cosmological argument, also known as the Principle of Sufficient Reason, aims to demonstrate that there must be a necessary, uncaused, timeless, spaceless, immaterial, personal creator of the universe. According to the argument, every contingent thing in the universe has an explanation for its existence, and this explanation must ultimately rest on a necessary being that exists by its own nature and does not depend on anything else for its existence. This necessary being, by definition, must possess the attributes mentioned above. Therefore, if the argument is successful, it would indeed prove the existence of a necessary, uncaused, timeless, spaceless, immaterial, personal creator of the universe.

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suppose the potential energy of the block at the table is given by mgh/3 . this implies that the chosen zero level of potential energy is . word in the statement of this problem allows you to assume that the table is frictionless?

Answers

The force exerted by the table on the block is equal to mg/3, which implies that the table is frictionless, since there is no additional force required to overcome friction.

To calculate the potential energy of the block, we need to first choose a zero level of potential energy. Let's assume that the chosen zero level is the surface of the table. Therefore, the height of the block above the zero level is simply the height of the block itself, which we can denote as h'. Therefore, the potential energy of the block is given by:

PE = mgh ÷ 3 = mg(h + h') ÷ 3

where h is the height of the table above the ground. Since the block is at rest on the table, the net force acting on it is zero. Therefore, the gravitational force acting on the block must be balanced by an equal and opposite force from the table, which we can denote as [tex]F_{table}[/tex]. Therefore, we have:

mg = [tex]F_{table}[/tex]

The work done by the table in lifting the block from the ground to the table is equal to the change in potential energy of the block, which is given by:

W = PE = mg(h + h') ÷ 3

Therefore, we have:

[tex]F_{table}[/tex] (h + h') = mg(h + h') ÷ 3

Simplifying this equation, we get:

[tex]F_{table}[/tex] = mg/3

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If a spacecraft is moving at 20,000 mph (in space), it will continue to move at 20,000 mph when its engines shut off.
Which Law explains this?
Choose matching definition
Newton's first law of motions
All of these
Fruitfulness
scope
testability
Sum to you equal weight

Answers

If a spacecraft is moving at 20,000 mph (in space), it will continue to move at 20,000 mph when its engines shut off.

The law that explains this is Newton's first law of motion.

Newton's first law of motion, also known as the law of inertia, states that an object at rest will stay at rest, and an object in motion will continue in motion with the same speed and direction, unless acted upon by an external force.

In the case of the spacecraft moving at 20,000 mph, it will continue to move at that speed when its engines shut off, because there are no external forces acting upon it in the vacuum of space.

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10. A roller coaster accelerates at 8.75 m/s² from rest to a final velocity of 70 m/s. How long does it
take to speed up?

Answers

A roller coaster accelerates at 8.75 m/s² from rest to a final velocity of 70 m/s it takes 8 sec to speed up.

How to calculate time?Using the equation v = u + at, we can find:70 m/s for final velocityThe roller coaster starts at rest, therefore u = starting velocity = 0 m/s.8.75 m/s2 for acceleration and time, respectivelyWhen we solve for t, we obtain:t = (v - u) / at = (70 m/s - 0 m/s) / 8.75 m/s2 t = 8 sec.In light of this, the roller coaster's acceleration takes 8 seconds.The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. The vector quantity of accelerations. The direction of the net force that is acting on an object determines its acceleration.

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a sled and rider (combined mass of 79 kg) finish a downhill run with a speed of 31 m/s, then enter a flat (horizontal) area where the sled slows down at a constant rate of -1.82 m/s2 until it stops. what distance did the sled move while slowing down?

Answers

The sled moved a distance of 293.9 meters while slowing down.

To solve this problem, we can use the kinematic equation:

[tex]v^{2} = u^{2} +2as[/tex]

where v is the final velocity, u is the initial velocity, a is the acceleration, and s is the distance.

Before the sled starts slowing down, its velocity is 31 m/s. When it comes to a stop, its velocity is 0 m/s. Therefore, the initial velocity u is 31 m/s and the final velocity v is 0 m/s.

The acceleration of the sled while it is slowing down is -1.82 m/s^2 (negative because it is in the opposite direction of the sled's initial velocity).

Substituting these values into the kinematic equation, we get:

[tex]0^{2} = 31^{2} +2(-1.82)s[/tex]

Solving for s, we get:

[tex]s = (0-31^{2})/2(2(-1.82)) = 293.9 meters[/tex]

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If the Law of Conservation of Momentum is true, then how does the total momentum before a collision compare to the total momentum after a collision?

Answers

Answer:

According to the Law of Conservation of Momentum, the total momentum of a closed system remains constant before and after a collision. This means that the total momentum before a collision is equal to the total momentum after the collision.

In other words, the total momentum of all the objects involved in a collision, such as two colliding balls or two vehicles crashing, will be the same before and after the collision, assuming no external forces are acting on the system. Momentum is a vector quantity that depends on the mass and velocity of an object, and it is conserved in the absence of external forces.

This principle of conservation of momentum is a fundamental concept in physics and is widely used in analyzing and predicting the outcomes of collisions in various scientific and engineering applications, such as in physics, engineering, and transportation safety.

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A tank of helium gas used to inflate toy balloons is at a pressure of 15.5x106 Pa and a temperature of 293 K. The tank’s volume is 0.020 m3. How large a balloon would it fill at 1.00 atmosphere and 323 K?

Answers

Under the circumstances, a balloon with a volume of 0.035 m³ could be filled from the helium gas tank.

A weather balloon with a 2000L volume has what pressure?

At an altitude of 1000 metres, where the atmospheric pressure is measured to be 60.8 kPa, a weather balloon with a 2000-liter volume and a pressure of 96.3 kPa ascends.

PV = nRT

n = PV/RT = (15.5x10⁶ Pa x 0.020 m³) / (8.31 J/K/mol x 293 K) = 0.0148 mol

Next, we can use the ideal gas law again to find the new volume of the helium at the given conditions:

(P1V1)/T1 = (P2V2)/T2

We can solve for V2:

V2 = (P1V1T2)/(P2T1) = (15.5x10⁵ Pa x 0.020 m³ x 323 K)/(1 atm x 293 K) = 0.035 m³

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a board that is 20.0 cm wide, 5.00 cm thick, and 3.00 m long has a density 300 kg/m3. the board is floating partially submerged in water. what fraction of the volume of the board is above the surface of the water?

Answers

The buoyant force on the board is equal to the weight of the water displaced by the submerged portion of the board. The weight of the board itself can be found from its volume and density:

Volume of board = length x width x thickness = 3.00 m x 0.200 m x 0.0500 m = 0.03 [tex]m^3[/tex]

Weight of board = volume x density x gravity = 0.03 m^3 x 300 kg/[tex]m^3[/tex] x 9.81 [tex]m/s^2[/tex] = 88.29 N

The buoyant force is equal to the weight of the water displaced:

Buoyant force = weight of water displaced = density of water x volume of water displaced x gravity

The density of water is 1000 kg/[tex]m^3,[/tex] and the volume of water displaced is equal to the volume of the submerged portion of the board, which can be found from the height of the board above the water level:

Height above water level = 3.00 m - submerged height

Submerged height = density of board x volume of submerged portion / (density of water x width x thickness)

Submerged height = 300 kg/[tex]m^3[/tex] x V / (1000 kg/[tex]m^3[/tex] x 0.200 m x 0.0500 m) = 0.09 V

The buoyant force is then:

Buoyant force = 1000 kg/[tex]m^3[/tex]x 0.09 V x 9.81 [tex]m/s^2[/tex]= 88.29 N

Since the board is floating partially submerged, the buoyant force is equal to the weight of the submerged portion of the board. The fraction of the board that is above the surface of the water is equal to the ratio of the weight of the submerged portion to the weight of the entire board:

Fraction above water = (weight of board - weight of submerged portion) / weight of board

Fraction above water = (88.29 N - buoyant force) / 88.29 N

Fraction above water = (88.29 N - 88.29 N) / 88.29 N = 0

Therefore, none of the board is above the surface of the water.

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which is the most likely reason that paper clip y does not move toward the magnet? responses paper clip y is not magnetic like paper clip z. paper clip y is not magnetic like paper clip z. paper clip y is outside of the magnetic field produced by the nail. paper clip y is outside of the magnetic field produced by the nail. paper clip y is not light enough to be pulled by the electromagnet. paper clip y is not light enough to be pulled by the electromagnet. paper clip y is being repelled by the electromagnet.

Answers

The most likely reason that paper clip y does not move toward the magnet is paper clip y is outside of the magnetic field produced by the nail. The correct option to this question is C.

Effect of magnetThe paper clip's steel acts as a magnet, and as you move the magnet along it, it pulls on each domain and moves the north and south poles so that the majority of them point in the same way. Thus, the paperclip becomes magnetic.Items made of steel, iron, cobalt, and nickel are drawn to magnets. Since galvanized steel wire is typically used to make paperclips, they are magnetic.The magnetic field affects the clip. The clip will be drawn toward the magnet by the magnet's magnetic field.Objects are pulled or pushed by magnetic forces, which are non-contact forces. Few magnetic' metals, and not all matter, are drawn to magnets. Magnets are both drawn to and drawn away from other magnets.

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Complete question :

which is the most likely reason that paper clip y does not move toward the magnet? responses

A. paper clip y is not magnetic like paper clip z.

B.  paper clip y is not magnetic like paper clip z.

C. paper clip y is outside of the magnetic field produced by the nail. paper clip y is outside of the magnetic field produced by the nail.

D. paper clip y is not light enough to be pulled by the electromagnet.

E. paper clip y is not light enough to be pulled by the electromagnet.

F. paper clip y is being repelled by the electromagnet.

a ball with a mass of .15 mg is moving at 3m/s. what is the momentum of the ball?

a train car with a mass of 250 kg is moving at 4 m/s. what is the movementum of the train car

momentum is the same for a dog with a mass of 12kg and a dog with a mass of 14kg because their velocity is the same
true or false

all moving objects at the same velocity move the same momentum
true or false


the momentum of a truck moving at 20 m/s is the same as a bicycle moving at 20 m/s
true or false

Answers

The momentum of the ball is approximately 0.00045 g m/s.

the momentum of the train car is 1000 kg m/s.

False. The momentum of an object depends on both its mass and velocity

True. If two objects have the same velocity, their momenta will be the same as long as their masses are equal.

False. The truck moving at 20 m/s will have a much larger momentum than a bicycle moving at 20 m/s

What is momentum

The momentum (p) of an object is defined as the product of its mass (m) and velocity (v), so we can use the formula p = m*v to solve the problems:

The momentum of a ball with a mass of 0.15 mg (0.00015 g) moving at 3 m/s is:

p = mv = (0.00015 g)(3 m/s) = 0.00045 g m/s.

So, the momentum of the ball is approximately 0.00045 g m/s.

The momentum of a train car with a mass of 250 kg moving at 4 m/s is:

p = mv = (250 kg)(4 m/s) = 1000 kg m/s.

So, the momentum of the train car is 1000 kg m/s.

False. The momentum of an object depends on both its mass and velocity, so two objects with different masses will have different momenta even if they have the same velocity.

True. If two objects have the same velocity, their momenta will be the same as long as their masses are equal.

False. The momentum of an object depends on both its mass and velocity, so a truck moving at 20 m/s will have a much larger momentum than a bicycle moving at 20 m/s, since the truck has much more mass.

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Most battery-powered devices won?t work if you put the battery in backward. But for a device that you plug in, you can often reverse the orientation of the plug with no problem. Part A Explain the difference. a. You can often reverse the plug in the wall because it is an AC. However, a battery is a DC. b. Battery-powered devices are low-powered. c. Battery-powered devices have many defects in their construction d. You can often reverse the plug in the wall because it is a DC. However, a battery is an AC.

Answers

Battery-powered devices require the correct orientation of the battery to function properly.

The difference between being able to reverse the orientation of a plug in a wall outlet versus a battery has to do with the type of electrical current being used.

Wall outlets provide AC (alternating current) power, which means that the direction of the electrical flow switches back and forth rapidly. This means that the orientation of the plug doesn't matter, since the current will flow in either direction.

In contrast, batteries provide DC (direct current) power, which means that the electrical flow only goes in one direction. If a battery is inserted backwards, the current will flow in the wrong direction and the device won't work properly or may even be damaged. Therefore, battery-powered devices require the correct orientation of the battery to function properly.

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For battery-powered gadgets to operate properly, the battery must be positioned correctly.

The type of electrical current being utilised determines whether a plug in a wall outlet can be turned around vs whether a battery can.

The electricity that comes out of wall plugs is AC (alternating current), which means that the flow of electricity rapidly changes direction. Because the current can flow in either direction, the plug's orientation is irrelevant.

Batteries, on the other hand, deliver DC (direct current) power, which refers to electrical flow that only occurs in one direction. The device won't function properly or might even be harmed if a battery is inserted backwards since the current will flow in the wrong direction. As a result, batteries must be oriented appropriately for battery-powered gadgets to work properly.

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do photoelectrons from metal 1 have a higher speed, a lower speed, or the same speed as photoelectrons from metal 2?

Answers

photoelectrons from metal 1 have a higher speed, a lower speed, or the same speed as photoelectrons from metal 2, If the kinetic energy of photoelectrons from metal 1 is higher than that of metal 2, then the photoelectrons from metal 1 have a higher speed. If the kinetic energy is lower, they have a lower speed. If the kinetic energies are equal, the photoelectrons have the same speed.

we need to consider the following steps:

1. Determine the work function of both metals (the minimum energy required to release an electron from the metal surface). The work function is specific to each metal.
2. Identify the energy of the incident light, which should be the same for both metals to make a fair comparison.
3. Use the photoelectric effect equation: Kinetic energy of photoelectrons = Energy of incident light - Work function of the metal.
4. Compare the kinetic energy of the photoelectrons from both metals.

If the kinetic energy of photoelectrons from metal 1 is higher than that of metal 2, then the photoelectrons from metal 1 have a higher speed. If the kinetic energy is lower, they have a lower speed. If the kinetic energies are equal, the photoelectrons have the same speed.

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acid precipitation can be traced back to a the burning of fossil fuels. b the release of particulate matter into the atmosphere. c thermal inversions. d the use of electrostatic precipitators.

Answers

Acid precipitation is caused by the burning of fossil fuels, which releases sulfur dioxide and nitrogen oxides into the atmosphere. The correct option is a) the burning of fossil fuels.

What causes precipitation of acid?

Released into the atmosphere, sulphur dioxide and nitrogen oxides react with water, oxygen, and other elements to produce sulfuric acid and nitric acid, respectively. Acid-impacted rain often has a pH that is below 4.5.

What kind of contaminants are created when fossil fuels are burned?

Nitrogen oxides are released into the atmosphere during the burning of fossil fuels and contribute to the formation of smog and acid rain.

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a 100-kg astronaut throws a 1-kg wrench with a force of 1 n. what is the acceleration of the wrench after the wrench leaves the astronaut’s hand?

Answers

To find the acceleration of the 1-kg wrench after it leaves the 100-kg astronaut's hand when thrown with a force of 1 N, you can use Newton's second law of motion:

Newton's second law of motion, also known as the law of acceleration, states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. Mathematically, the second law can be expressed as:

Force = mass x acceleration.

Step 1: Identify the known values.
Force (F) = 1 N
Mass (m) = 1 kg

Step 2: Use Newton's second law of motion to calculate acceleration (a).
F = m * a
1 N = 1 kg * a

Step 3: Solve for acceleration (a).
a = F / m
a = 1 N / 1 kg
a = 1 m/s²

The acceleration of the wrench after it leaves the astronaut's hand is 1 m/s².

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Newton's second law of motion can be used to determine the acceleration of the 1-kg wrench after it leaves the 100-kg astronaut's hand when thrown with a force of 1 N:

The acceleration of an object is directly proportional to the force acting on it and inversely proportional to its mass, according to Newton's second rule of motion, commonly referred to as the law of acceleration. The second law can be defined mathematically as:

Mass times acceleration equals force.

Determine the values that are already known.

Mass (m) = 1 kg and Force (F) = 1 N

Step 2: Determine the acceleration (a) using Newton's second rule of motion.

F = m * a

1 N = 1 kg * a

Calculate acceleration (a) in step three.

a = F/m, a = 1 N/kg, a = 1 m/s2, etc.

After leaving the astronaut's hand, the wrench accelerates at a rate of 1 m/s2.

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What does freezing in the water cycle mean

Answers

Answer: Changing state from a liquid to a solid

Explanation: When liquid water loses thermal energy, it gets cold and undergoes freezing.

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