10. a helium balloon is held by its string in a car with the windows rolled up. the car, initially at rest, accelerates forward. which direction does the balloon move? explain.

Answers

Answer 1

The helium-stuffed ball is surely transferring against the direction of what looks like gravity.

The equal thing that it does while you're not in an accelerating body. It does that for the equal motive: buoyancy because of being lighter than air. The air inside the vehicle has a higher density inside the back of the car than it does inside the front. this means that the net pressure on the balloon due to collisions with the air will be in the ahead path.

The balloon does the other to something your body could do. for that reason, if the car comes to rest the balloon moves toward the return. The secret is that the balloon is filled with helium (He) and you are made of stuff a great deal heavier than air.

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Related Questions

two 16.0 $kg$ ice sleds are placed a short distance apart, one directly behind the other, as shown in the figure. a 3.11 $kg$ cat, initially standing on sled 1, jumps across to sled 2 and then jumps back to sled 1. both jumps are made at a horizontal speed of 2.00 $m/s$ relative to the ice. what is the final speed of sled 2? (assume the ice is frictionless.)

Answers

The final speed of sled 2 = 0.77 m/s

What is impulse?

Impulse is the integral of the force (F) over the time interval (t) for which the force acts. Since force is a vector quantity, momentum is also a vector quantity. Momentum applied to an object produces a vector change equivalent to its linear momentum, and the resulting direction is also changed.

For the given case:

After first jump speed of sled 1 is = u₁

Since there is no external force acting on the sled-cat system there'll be no change in momentum.

u₁ × 16 + 2 × 3.11 = 0

u₁ = -0.38 m/s

Now, for sled 2

2 × 3.11 = (3.11 + 16)u₂

u₂ = 0.32 m/s

After the second jump:

-2 × 3.11 + 16 × v₂ = 0.32 × (16 + 3.11)

v₂ = 0.77 m/s

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a ball is kicked with an initial velocity of 23 m/s in the horizontal direction and 14 m/s in the vertical direction. (assume the ball is kicked from the ground. for each answer, enter a number.) (a) at what speed (in m/s) does the ball hit the ground? m/s (b) for how long (in s) does the ball remain in the air? s (c) what maximum height (in m) is attained by the ball?

Answers

The speed of the ball is 192m/s. The long of the ball is 2.85s.The height of the ball is 2.13m.

How to calculate speed?

A)The speeds at these points are equal since the starting position and the point at which it touches the ground have the same elevation. Solving the product of the horizontal and vertical velocities yields the final speed. Which is

vf=√(V[tex]ox[/tex])²+(V[tex]oy[/tex])²

vf=√(23m/s)²+(14m/s)²

vf=192m/s

How to calculate long?

B)Take into account the starting point and the highest point, respectively.

We are aware that the vertical velocity is zero at the highest point. Additionally, we are aware that the duration of the flight from start to finish is twice as long.

So, we'll apply the formula t=v[tex]f[/tex]-v[tex]o[/tex]/a

   t=2(v[tex]top[/tex]-v[tex]o[/tex])/a

    t=2(0m/s-14m/s)/-9.81m/s

t=2.85s

How to calculate height?

C)Using the formula, the highest height that can be reached can be determined.(v[tex]f[/tex])²=(v[tex]0[/tex])²+2ay

This is how the maximum height is determined:

                    (v[tex]f)[/tex]²=(v[tex]0)[/tex]²+2ay

                    y[tex]max[/tex]=(v[tex]top[/tex])²-(v[tex]o[/tex])²÷2a

    y[tex]max[/tex]=(0m/s)²-(14m/s)²÷2(-9.81m/s)²

            =2.13m

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What is the Period (T) of this wave?

a. 3.9 cm
b. 0.4 Hz
c. 2.5 sec
d. 1.6 cm/s​

Answers

The time period of the wave is 2.5 seconds. Option C

How is the duration of a wave defined?

The duration of time it takes for two crests of a single wavelength to pass a specific location is termed as the time period of a wave.Seconds are frequently used to describe the wave period.

Since frequency and wave period are inversely proportional, the wave period can be calculated using the following formula:

                                                  T = 1/f

                                                  T = λ /v

where T is the time period in seconds, f is the wave frequency, is the wavelength in meters, and v is the speed in meters per second.

Time is divided into periods by the quantity of oscillations. Two oscillations are shown in the diagram. By counting the wave's crests one by one starting at the 0s point, this may be seen. Two oscillations end in five seconds. 2 divided by 5 equals 2.5 seconds.

Hence, Option c) 2.5 is correct.

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If the man pulls the sled with a 10 N
force, what is the horizontal component
of force? Refer to chapter 4, mechanics if
you do not remember how to resolve a
force into its components.

Answers

Answer:

   

Explanation:

The horizontal component of force is Fcosθ if the man pulls the sled with a 10 N force.  Force has both a magnitude and a direction since it is a vector quantity.

What is force?

A force is an external cause that, when applied, alters or has the potential to alter a body's condition. The body comes to rest while it is moving, and it moves when it is at rest.

The body's orientation, form, size, etc. may also alter as a result. An illustration would be to push or forcefully shove a door. Force has both a magnitude and a direction since it is a vector quantity. If the man pulls the sled with a 10 N force then the horizontal component of force is Fcosθ. Your training at this level should place a major emphasis on the idea that a push or even a pull was referred to as an force.

Therefore, the horizontal component of force is Fcosθ if If the man pulls the sled with a 10 N force.

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A 2.5 newton weight falls freely from rest from the roof of a building. What is the total distance the weight falls in the first 4.0 seconds?

Answers

Answer:

Explanation:

L = g·t² / 2 = 9.8·4.0² / 2 = 78.4 m

A 5 kg block is pulled across the ground to the right by a tension force of 40 N with a frictional force of 8 N opposing the motion. What is the acceleration of the object?

Answers

The Acceleration of the object = 6.4 m/s²

Mass of block (m) = 5 kg

Action force on block, (F₁) = 40 N

Frictional force opposing the motion (F₂) = 8 N

Acceleration of the object (a) = ?

⇒ Net force = Action force on block - Opposing friction force

⇒ F = F₁ - F₂

⇒ F = 40 - 8

⇒ F = 32 N

Net force of the block (F) = 32 N

Mass of block (m) = 5 kg

F is the Force in N.

m is the Mass in kg.

a is the Acceleration in m/s².

F = ma

⇛ a = F/m

⇛ a = 32/5

⇛ a = 6.4 m/s²

You must use Fnet=ma

Ft-Ff=ma

40-8=5*a

a=6.4m/s^2

a 500-w device is connected to a 120-v ac power source. what is the peak voltage across this device? a) 4.2 v b) 5.9 v c) 120 v d) 150 a e) 170 v

Answers

The peak voltage across this device would be 170v (rounded). So the answer is E.

What is peak voltage?

It is the highest point or highest value of voltage for any voltage waveform. It is a power quality issue that occurs when devices that use Pulse Width Modulation, such as a variable frequency drive, is added to a power system. The resulting peak voltage is a result of the switching speed and length of cable (increasing impedance).

Now, we need to find the peak voltage based on the information given from the question.

Vrms = 120V (given)

the formula is Vrms = Vpeak / [tex]\sqrt{2}[/tex]
Vpeak = [tex]\sqrt{2[/tex]Vrms

= [tex]\sqrt{2}[/tex] * 120
Vpeak = 170v (rounded)

So, the peak voltage of this device would be (E) 170v.

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On a wet road, is a higher coefficient of friction on the tires safer or a lower one and pls explain I don’t get it. I would love to make this question worth more points but someone stole all 20 points without helping me, I’m rlly exhausted please help

Answers

In plain terms, COF measures how slippery a surface is, and how much friction it generates. More friction is better, because more friction means better traction and thus a lower likelihood of slipping. A low COF means there is less friction, and thus, it is easier to fall.

Jones and Childers report coefficients of friction of about 0.7 for dry roads and 0.4 for wet roads. The tread design represents an "all weather" compromise. If you were an Indianapolis race driver, you would use "slick" racing tires with no tread. On dry surfaces you might get as high as 0.9 as a coefficient of friction, but driving them on wet roads would be dangerous since the wet road coefficient might be as low as 0.1 .


An astronaut orbits the Earth in a space station.Which is a vector quantity

Answers

The force of gravity is the only force acting upon their body. The astronauts are in free-fall.

If the astronaut is formed of the same amount of material as before, the mass will always be the same.

So, when asked what the astronauts' mass is on the space station, we can respond it's still 65 kg. Because there is no gravity in space, astronauts float around.

Everyone understands that the gravitational force decreases with distance from Earth. Astronauts are so far away from Earth that gravity is negligible. This is why NASA refers to it as microgravity.

Mass is the same whether measured on Earth or on the International Space Station. Weight can vary based on gravitational pull, such as on the Moon, where weight is one-sixth that of Earth.

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Mars has an orbital period of 4333 earth days, find the semi major axis of it's orbit ​

Answers

Answer:372

Explanation:

A 0. 0850-kg arrow is fired horizontally. If the bowstring exerts an average force of 89. 0 n on the arrow over a distance of 0. 782 m, with what speed does the arrow leave the bow?.

Answers

40.47 m/s is the speed at which the arrow departs the bow.

Does velocity not depend on gravity?

An object's horizontal velocity is constant for small displacements and operates independently of the vertical force of gravity. The horizontal and vertical halves of an object that is projected at an angle to gravity can also be separated. The force of gravity has no impact on the horizontal velocity component either.

The arrow will start moving and accelerating as soon as it is let go from the bow. The arrow obeys the second law of motion, according to Newton. The method

m = mass of the arrow (kg) = 0.0850 kg

a = acceleration of the arrow (m/s²)

F = force (N) = 89.0 N

F=m*a

a = 1,047.059 m/s²

When an object accelerates, it will travel in a non-uniform manner. The method

[tex]v^{2} = v_{0} ^{2} +2*a*d[/tex]

= 40.47 m/s

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How much energy is stored in the 180-µF capacitor of a camera flash unit charged to 300.0 V?

Answers

Energy is stored in the 180-µF capacitor of a camera flash unit charged to 300.0 V is 8.10 J.

A capacitor is a tool that stores electrical electricity in an electric-powered field by way of the distinctive feature of accumulating electric expenses on two close surfaces insulated from each other. it's miles a passive digital component with terminals.

The impact of a capacitor is called capacitance. A capacitor is an electrical component that shops capacity power. Capacitors hold wonderful and bad electricity on separate plates separated by way of an insulator. A capacitor(s) is called cap(s) for brief.

Calculation:-

energy stored in capacitor = C V^2 /2  

= 180 x 10^-6  x 300^2  / 2   = 8.10 J

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a dockworker loading crates on a ship finds that a 29-kg crate, initially at rest on a horizontal surface, requires a 71-n horizontal force to set it in motion. however, after the crate is in motion, a horizontal force of 50 n is required to keep it moving with a constant speed. find the coefficients of static and kinetic friction between crate and floor.

Answers

The coefficients of static and kinetic friction between crate and floor are

0.25 and 0.176 respectively.

When a body is at rest and if a force is applied to move it, then it would require the force which is equal to the static friction force, if

fs is the static frictional force and the us is the static friction coefficient and Fn is the normal force

[tex]f_{s}[/tex] = us*Fn

Fn = mg

putting the appropriate values, we get

=  71/(29*9.8) = 71/284.2

= 0.2498 = 0.25

Now, similarly when body is in motion, kinetic frictional force is applied, so we can write

[tex]f_{k}[/tex] = uk*Fn

so putting the appropriate values, we get

= 50/mg = 50/284.2 = 0.1759

= 0.176

Hence the value of coefficient of static friction is 0.25 and the value of coefficient of kinetic friction is 0.176.

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a golf ball of mass 45.93 g has a velocity of 74.22 m/s immediately after being struck. if the club and ball were have an average contact force of 8896 n, how long does the contact last?

Answers

The time for that contact force is 0.00038 s.

An impulse is a surprising pressure or choice — this will be an electrical impulse or an impulse to get a few pizzas. if you act on an unexpected feeling or concept, you're following an impulse. it's like a whim: an impulse is not something you have given quite a few concepts. The impulse of pressure is the product of the resultant pressure ΣF and the length of this force Δt if the pressure is constant. The impulse of pressure is the purpose of changes to movement and consequently changes to momentum.

Momentum is a vector amount that has an equal path to the velocity of the item. the amount of force accelerated by the time it's far implemented is called impulse. Impulse is a vector quantity that has an equal path to the pressure. Momentum and impulse have equal gadgets: kg·m/s

Calculation:-

mass =  45.93 g = 0.046 kg

velocity =  74.22 m/s

Impulse = Change in Momentum

Ft = mv

t =  0.046 ×  74.22 / 8896

= 6455.696 N

= 3.8 × 10⁻⁴ Sec

Therefore, the time for that contact force is 0.00038 s.

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Where do you predict the energy that is not transferred into the electrical grid is lost as it moves from
system to system?

Answers

The energy that is not transferred into the electrical grid is lost as heat as it moves from system to system.

The electricity that is produced in power stations reach the consumers through a complex system of electric cables and grid. The grid usually means transformers which is used to step up and step down the voltage when necessary.

The first transformer from the power plant steps up the voltage of the current for the purpose of long distance transmissions. Before entering the household another transformer steps down the voltage to avoid short circuiting the electrical appliances. During all these processes the current is carried through electrical lines. Due to its contact with the atmosphere some energy is lost has heat in the air.

Therefore, the energy that is not transferred into the electrical grid is lost as heat as it moves from system to system.

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a playground merry-go-round has a mass of 120 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.600 rev/s. what is its angular velocity (in rev/s) after a 21.0 kg child gets onto it by grabbing its outer edge? the child is initially at rest.

Answers

The value of the final angular velocity = 0.44 rev/s

How to calculate the angular velocity?

Let Initial angular momentum = [tex]L_{i}[/tex]

Let Final angular momentum = [tex]L_{f}[/tex]

Here, mass of merry go round = [tex]m_{m}[/tex] = 120 kg

radius= r = 1.8 m

initial angular velocity = [tex]w_{i} = 1.2 \pi[/tex]rad/s

mass of the child = [tex]m_{c}[/tex] = 21kg

By law of conservation of angular momentum,

[tex]L_{i}=L_{f}\\\\I_{m}w_{i}=I_{m+c} w_{f}\\\\w _{f} =\frac{I_{m}w_{i}}{I_{m+c}}[/tex]

Here, substitute  [tex]I = \frac{mr^{2} }{2}[/tex]

[tex]w _{f} =\frac{I_{m}w_{i}}{I_{m+c}}\\\\w _{f} =\frac{\frac{m_{m}{r _{m}}^{2}}{2} w_{i}}{\frac{m_{m}{r _{m}}^{2}}{2}+{m_{c}r_{c}}^{2} }\\\\w _{f}= \frac{\frac{120(1.8)^{2} }{2} *1.2\pi}{\frac{120(1.8)^{2} }{2} +21(1.8)^{2}}\\\\w _{f} = 2.8 rad/s[/tex]

The value of the final angular velocity = 2.8 rad/s

                                                                =2.8/2 π

                                                                = 0.44rev/s

What is angular velocity?The rotation rate, which refers to how quickly an object rotates or revolves in relation to another point, is measured vectorially using angular velocity. The speed at which an object rotates or revolves around an axis is known as its angular velocity. Because a point on a rotating object constantly changes direction, it is challenging to determine the direction of the angular velocity. The rotating object only has a fixed direction at its axis.

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male lions and human sprinters can both accelerate at about 10.0 m/s2. if a typical lion weighs 170 kg and a typical sprinter weighs 75 kg, what is the difference in the force exerted by the ground during a race between these two species? (both the forward and normal forces should be calculated.)

Answers

The difference in the force exerted by the ground during a race between these two species is 259.25

What is force?

Forces are influences that can change the movement of an object. A force can change the velocity of an object with mass, i.e. accelerate it. Forces can also be described intuitively by pushing or pulling. A force has both magnitude and direction and is a vector quantity.

Force exerted by the lion:

Normal force = mg

170 = m × 9.8

m = 17.34 kg

Forward force = ma

= 17.34 × 10.0

= 173.4 N

Total force = Normal force + Forward force

Total force = 170 + 173.4

= 343.4 N

Force exerted by the man:

Normal force = mg

75 = m × 9.8

m = 7.65 kg

Forward force = ma

= 7.65 × 10.0

= 76.5 N

Total force = Normal force + Forward force

Total force = 7.65 + 76.5

= 84.15 N

The difference in the forces exerted by these species is:

343.4 N - 76.5 N = 259.25 N

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Gabriel kicks a soccer ball so that it has an initial velocity 22 meters per second, at an angle of 16 above the ground. How much time does it take for the soccer ball to reach its maximum height?

0.62s
2.24s
0.77s
2.16s

WHICH ONE???

Answers

The time taken to reach the maximum height, given that the ball has an initial velocity of 22 m/s is 0.62 s

How do I determine the time taken to reach the maximum height?

The time taken to reach the maximum height can be obtained by using the following formula:

t = uSineθ / g

Where

t is the time taken to reach the maximumu is the initial velocityθ is the angle of projectiong is the acceleration due to gravity

Now, we shall determine the time taken to reach the maximum as follow:

Initial velocity (u) = 22 m/sAngle of projection (θ) = 16 °Acceleration due to gravity (g) = 9.8 m/s²Time taken to reach the maximum height (t) = ?

t = uSineθ / g

t = (22 × Sine 16) / 9.8

t = 0.62 s

Thus, the time taken is 0.62 s

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a bus traveled 387 km in 5 h.one hour of the trip was in city traffic. the bus's city speed was just half of its speed on open highway. the rest of the trip was on open highway. find the bus'scity speed

Answers

The bus'scity speed is 77.4km/hr.

How is speed defined in?

What constitutes speed? the speed of a change in an object's position in any direction.

Speed is the rate of change in location of an item, expressed in meters per second. If something starts at the origin and goes three meters in three seconds, for instance, its speed is one meter per second. Like distance divided by time, the equation for speed is straightforward.

A change in an object's position over time is referred to as motion in physics. Displacement, distance, velocity, acceleration, time, and speed all play a role in how motion is defined. Speed is a scalar variable that describes how quickly an object travels through space with regard to time.

speed = distance/time

speed =387/5

speed =77.4km/hr.

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a bear sling is used in some national parks for placing backpackers' food out of the reach of bears. as the backpacker raises the pack by pulling down on the rope, the force f needed:

Answers

Force is to be known for this problem.

What is force?

In physics, force is the push or pull that an object feels when its mass causes it to change its velocity. An external force has the ability to change a body's resting or moving state. It moves and has a size.

What constitutes speed?

the speed at which the position of an object is shifting, in any direction. Speed is defined as the product of the distance traveled and the time needed to cover that distance. Since speed simply has a focus and no magnitude, it is a scalar number.

2T cos∅ =μg

⇒ if weight (μg)

rises

⇒∅ increases

⇒ cos∅ decreases

⇒T increases

⇒F will also increases

But ∴ Cos 90° = u

⇒ not possible.

Therefore, the force is to be needed.

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a 1621 kg car is traveling down the road at 84.6 km/h. while traveling at this rate of speed, what is the kinetic energy of this vehicle in kilojoules?

Answers

The kinetic energy of the car in kilojoules is 447 KJ.

The kinetic energy of the car is, E = 1/2 m[tex]v^{2}[/tex]

The velocity of the car is,  v = v (1000m/3600s)

V = 23.5 m/s

The kinetic energy of the car in joules is,

E = 1/2m[tex]v^{2}[/tex]

E = 1/2 (1621)(23.5)

E = 447KJ

An object's kinetic energy is the power it draws from movement. It is described as the amount of effort required to accelerate a body of a specific mass from rest to its specified velocity. The body keeps its kinetic energy after gaining it during acceleration, barring changes in speed. When slowing down from its current pace to a condition of rest, the body expends the same amount of energy. Any term in a system's Lagrangiam that has a derivative with respect to time is formally referred to as having kinetic energy.

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what is the magnitude of the net displacement of a point on the rim of the blade during the deceleration?

Answers

The net displacement of a point on the blade's rim as a result of the deceleration is 10.0 in. or 0.254 m..

In reality, the term "deceleration" refers to an acceleration that has been reversed. We are aware that deceleration is the rate at which an object slows down and that acceleration is the pace at which an object accelerates. For instance, when we apply the brakes while driving, we are employing the benefits of deceleration to lower the speed of the car.

When we sense ourselves going forward in relation to the car while driving, we are decelerating. Deceleration in this context is a specific case of acceleration that only applies to moving things. It is hence the speed at which an object slows down.

Since acceleration must be reported as both a magnitude and a direction, it is a vector. Whenever there is one-dimensional motion.

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how would stellar parallax observed from saturn differ from the stellar parallax we observe from earth?

Answers

Saturn is undergoing an apparent retrograde movement period as the Earth moves closer to Saturn in its orbit and then both planets are located on the side of the Sun. Stars that are nearer to us will exhibit higher parallax, similar to how it occurs on Earth.

The star parallax of the Earth is quite modest, barely 0.03 seconds of arc. It would be difficult to see against the backdrop of stars, even with a good telescope.

The angle between the Earth's place at a single time of year and the Earth 6 months later, as determined from a nearby star, is known as the parallax angle. This angle is used by astronomers to calculate how far away that star is from Earth.

We may calculate the distance to a nearby planet using the method described before, s. Now, measuring from an observation point O, we determine the angle the planet occupies, which is. Therefore, P1P2=d, where d is the planet's diameter. As a result, we may use the parallax method to calculate the radius of a neighboring planet.

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A gas receives from an external thermal source an amount of heat equal to 1000 J. This energy, in addition to producing heating in the gas, causes its expansion, with the consequent performance of work equivalent to 600 J. What was the change in the internal energy of the gas? gas?

help someone help me​

Answers

Hello..!

Subject: Thermodynamics

The first law of thermodynamics relates work and transferred heat exchanged in a system through a new thermodynamic variable, internal energy. This energy is neither created nor destroyed, only transformed.

We can think of gas as a thermodynamic system, all because gases can work and absorb heat, and then they can turn all that into energy.

The formula for the change in energy is given by the first law of thermodynamics expressed as:

[tex] \: \: \: \: \: \: \: \: \: \: {\boxed{\boxed{ \sf\large \rm \Delta U = Q - W }}}[/tex]

Being:

ΔU = change in energyQ = added heatW = Work done

Problem:

A gas receives from an external thermal source an amount of heat equal to 1000 J. This energy, in addition to producing heating in the gas, causes its expansion, with consequent performance of work equivalent to 600 J. What was the change in the internal energy of the gas? gas?

Data:

ΔU = ¿? (Meet)Q = 1000 JW = 600 J

Now adding the data in the formula to find the energy change:

[tex] \sf\large \rm \Delta U = 1000J - 600J[/tex]

[tex] \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \sf{\boxed{\boxed{\large \rm \Delta U = 400 J}}}[/tex]

[tex]\begin{gathered}\rule{7cm}{0.01mm}\\\texttt{Good studies! :D}\\\rule{7cm}{0.01mm}\end{gathered}[/tex]

the distance between x-ray tube and the bucky (the area that stores the film), is referred to as the .

Answers

An x-ray cassette is kept in a device called a "bucky" that resembles a drawer. It can be installed either on the wall or underneath the exam table.

These days, buckys have an internal grid that absorbs dispersed radiation to enhance the clarity of x-ray images. The oscillating option that modern buckys have added further aids in preventing scattered radiation from reaching the x-ray cassette and increases the quality of the x-ray image.To ensure that a high-quality x-ray image is created when using Bucky, an increase in radiation exposure parameters (kVp and mAs) is necessary. If Bucky is not utilized, the same x-ray technique can be carried out with lower exposure factors, but the image quality will suffer.

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Jasper is using an equal force to move a tennis ball and a bowling ball. What prediction can Jasper make about the force and the motion of the objects?

Both objects will have an equal change in motion.

Neither object will have any change in motion.

The bowling ball will have a greater change in motion.

The tennis ball will have a greater change in motion.

Answers

When Jasper uses the same amount of force to move a tennis ball and a bowling ball, d)the tennis ball will have a greater change in motion.

What is the second law of motion of Newton?

Newton's second law states that an object's net force is equal to the sum of its mass and acceleration.

F = ma is the formula, where F denotes force, m denotes mass, and a denotes acceleration.

When the force F is constant and we rearrange the equation, we get acceleration as a = F/m. We know that acceleration is inversely linked to the mass m. Greater mass results in smaller acceleration, and conversely, smaller mass results in greater acceleration.

We know that mass of bowling ball is more than tennis ball.

Tennis ball > bowling ball will have the highest rate of acceleration since the relationship between acceleration and mass is inverse.

It follows that tennis balls will accelerate their change of direction more quickly than bowling balls.

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Vector A is 3.2 m in length and points along the positive y-axis. Vector B is 4.6 m in length and points
along a direction 195° counterclockwise from the positive x-axis. What is the magnitude of the resultant
when vectors A and B are added?

Answers

Refer to the photo taken.

what kind of motion is a uniform circular motion? does the body have an acceleration in a uniform circular motion?

Answers

A uniform circular motion is one in which the velocity of the object remains constant. This means that the object is moving with a constant speed and in a circle, without acceleration.

In this type of motion, the acceleration is zero. Acceleration is defined as a vector quantity, which means that it has both magnitude and direction. In this case, both magnitude and direction are zero, so there is no acceleration—the body moves in a straight line at constant speed in a circle.

A body has an acceleration when it is changing its velocity, either increasing or decreasing it. An example would be stopping on a highway, where your foot would push down harder on the gas pedal to increase your speed while going around a curve, then slowing down as you straightened out again.

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the earth exerts a gravitational force on a person standing on the surface. the person also exerts a gravitational force on the earth. based on newton's laws, how do these two forces compare?

Answers

Answer:

F = M a        Newton's Second Law

The person is undergoing no acceleration, thus the upwards force of the earth on the person exactly balances the attraction of the earth on the person's center of gravity

(Also, Newton's third law that for every action there is an opposite and equal reaction}

Michael Hout of Ohio can run 110.0 meter hurdles in 18.9 s at an average speed of 5.82 m/s. What makes this interesting is that he juggles three balls as he runs the distance. Suppose Hout throws a ball up and forward at twice his running speed and just catches it at the same level. At what angle, θ, must the ball be thrown? (Hint: Consider horizontal displacements for Hout and the ball.)

Answers

Answer:

60 degrees

Explanation:

The ball must  be thrown at an angle 60°.

Given parameters:

Michael Hout of Ohio can run 110.0 meter hurdles in 18.9 s at an average speed of 5.82 m/s.

Hout throws a ball up and forward at twice his running speed and just catches it at the same level.

So, Speed of the ball = 2× 5.82 m/s. = 11.62 m/s.

The angle at which the ball thrown = θ.

According to the question,

Horizontal component of speed of the ball = Speed of  Hout

⇒  11.62 cosθ = 5.82

⇒ cosθ = 0.5

⇒ θ = 60°.

Hence,  the ball must be thrown at 60° angle.

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