How much work is done when a 100 Ib rock is lifted to a height of 3 ft? Work= . ft . lb

As the object is thrown up with the initial velocity of 20.0 m/s, and there is an air resistance force that would cause an acceleration of 3.00 m/s2, the speed of the object as a return to the ground is 10.8 m/s.

The kinematic equations are a set of equations that describe the motion of an object with constant acceleration.

When we have an initial velocity value, it is written as Vo, while for the final velocity, we simply write V or Vt. As an object moves through the air, air resistance slows the object’s speed.

The formula of the kinematic equation used for solving this case is

Vt = V0 + at (the gravity is 10 m/s2)

[tex]Vt = Vo + (-g-a)t\\\0 = 20 + (-10-3)t\\0 = 20-13t\\\13t = 20\\\t = \frac{20}{13}[/tex]

After the time is known, now we can insert the value into the following formula :

[tex]Vt = Vo + (g-a)t\\Vt = 0 + 7.\frac{20}{13} \\Vt = 0 + \frac{140}{13} \\\Vt = 10.8 m/s[/tex]

Thus, the speed of the object returns to the ground after being thrown up with an initial velocity of 20.0 m/s and acceleration of 3.00 m/s2, which is 10.8 m/s.

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when a planet, in its orbit, is closer to the sun, it moves faster than average.

In general, the closer a planet is to the Sun, the shorter its orbital period (the time it takes to complete one orbit) will be. As a result, the closer a planet is to the Sun, the faster it will be moving in its orbit.

This is due to the fact that the force of gravity from the Sun on the planet is stronger the closer the planet is to the Sun, which causes the planet to move faster in its orbit.

Additionally, planets that are closer to the Sun will also have a higher surface temperature because they receive more sunlight, and they may have a stronger magnetic field due to the stronger solar wind near the Sun.

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Your question seems incomplete, but I assume the full question was:

"when a planet, in its orbit, is closer to the sun, it:

(group of answer choices)

moves slower than average

spins faster on its axis

reflects less sunlight than average

feels less gravitational pull than average

moves faster than average."

0.034 second is the main time period of the motion for a machine which is operating at a speed of 1780 cpm.

Time period of an object is the time required for it to complete its one cycle or oscillation. Angular frequency is angular displacement of any object of the waves per unit time. The formula for time is, T = 1/f

where T is time-period and f is frequency.

Operating speed of the machine = 1780 cpm (cycle per minute)

Cycle in one minute = 1780

Cycle in 1 second = 1780/60 = 29.67 cycles

Time required in one cylcle, T = 1/29.67 = 0.034 second

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Two objects attract each other with a gravitational force of magnitude 1.00 × 1 0 − 8 1.00 \times 10 ^ { - 8 } 1.00×10−8 N when separated by 20.0 cm.

What is meant by magnitude?

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After a brief period of falling, the upward air friction on the cargo would equal the downward gravity pull if a parachute opened.

Air resistance reaches its maximum magnitude at the falling object's terminal velocity. Due to the fact that the two forces are acting in opposing directions, there is no net force acting on the item, and its speed has stabilised.

In addition, gravity is pulling the thing downward as it falls. Gravity is an imbalanced force at the beginning of a descent. The result is an increase in speed or acceleration for the object. Aerodynamic drag or air resistance is encountered as it accelerates.

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The distance which a force of 3N will pull a wooden block before transferring 12J of energy is 4m.

This is referred to as an influence that can change the motion of an object and the unit is Newton.

It has a relationship with distance and work which can be seen below:

Work = Force × distance

12J = 3N × d

d = 12/3 = 4m.

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The net force that acts on the object is 36.5 N.

We have to note that the first thing that we would have to obtain is the acceleration of the object and we can be able to obtain this by the use of the formula;

v ^2 = u^2 + 2as

v = final velocity

u = initial velocity

a = acceleration

s = distance

(0.75)^2 = (0)^2 + 2 * a * 5.5

a = (0.75)^2 / 2 * 5.5

a = 0.5625/11

a = 0.05 m/s^2

The net force is ma

F = 730 kg * 0.05 m/s^2

F = 36.5 N

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The electrons transferred during the process of rubbing a balloon on your head are -1.88×10¹¹.

The electrons, which are negatively charged particles, whirl about the nucleus' periphery. Because of how swiftly they rotate, it might be challenging for scientists to keep an eye on them. The tiny atoms in an atom are drawn to the positive ions of the protons; you can fit 2000 of them in a proton.

Charge on the balloon q = 30 nc

Charge on the electron = -1.6 × 10⁻¹⁹ C

The number of electrons is determined by adding the charge of one particle's entire value.

Suppose there are n electrons,

Number of electrons = (30× 10⁻⁹)/-1.6 × 10⁻¹⁹ = -(3× 10⁻⁸)/(1.6 × 10⁻¹⁹) = -1.88×10¹¹  

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The density of silicon is [tex]2.33 * 10^{-9} kg.m^{3}[/tex]

Given density of silicon  is 2.33 gram centimeter cube.

We know that:

                            100 cm = 1 m

                            1cm = 1/100m = [tex]10^{-2} m[/tex]

                            [tex]1 cm^{3} = 10^{-6} m^{3}[/tex]

Also,

        1000 gram = 1 kg

        1 gram = 1/1000 kg = [tex]10^{-3} kg[/tex]

Now, to convert gram centimeter cube into kilogram meter cube we should multiply by these values.

So, By putting these values we get:

Density = 2.33 * [tex]10^{-3} kg * 10^{-6} m^{3} = 2.33 * 10^{-9}kg. m^{3}[/tex]

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The upper fixed point, also known as steam point, is the temperature at which pure water boils at normal atmospheric pressure.

In case of the Celsius scale, the upper fixed point is 100°C.

This is the boiling point of pure water at 1atm which is the normal atmospheric pressure.

The pressure that the atmosphere exerts on the earth's surface is called atmospheric pressure.

The temperature at which liquid water starts changing into vapour is called boiling point.

Celcius is an unit of measuring temperature.

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The required acceleration has a magnitude of 19.7 m/s2  directed upwards, correct to three significant figures.

The the purpose of analysis, the motion of rocket is divided into two phases.

Phase 1: the free fall motion of the rocket from the height 2.98*102m to a height 96.5m.

Phase 2: the motion of the rocket due to the acceleration of the rocket also from the height 96.5 m to the point of touchdown y = 0m.

The initial velocity of the rocket is 0m/s when it started to experience a fall from rest under free fall. g = 9.8m/s² t1 is the time taken for phase 1 and t2 is the time taken for phase2.

The final velocity under free fall becomes the initial velocity for the accelerated motion of the rocket in phase 2 and the final velocity or speed in phase 2 is equal to zero.

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The greatest distance away from the initial position that an object can be if it struck by the airplane is 12.5 ft, if the initial speed of the airplane is 10 ft/s.

Initial speed of the paper airplane, u = 10 ft/s

Final speed of the paper airplane, v = 0

deceleration of the airplane, a = -4 ft/s²

By the first equation of motion, v = u -at

Time of flight, t = (v-u)/a

t = (0 - 10)/-4 = 2.5 sec

Maximum distance travelled by the airplane, = S

S = ut + 0.5at²

S = 10 × 2.5 - 0.5 × 4 × 2.5²

S = 12.5 ft

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In this case, the acceleration amplitude would be (0.23 ips x 1170 cpm)2 = 546.7 g.

Acceleration is the rate of change of velocity over time. It is a vector quantity, meaning that it has both magnitude and direction. The magnitude of acceleration is the rate at which the velocity changes, and the direction of acceleration is the same as the direction of the velocity.

Displacement amplitude:
The formula for displacement amplitude is displacement amplitude = velocity amplitude / (2πf).
In this case, the displacement amplitude would be 0.23 ips / (2π x 1170 cpm) = 0.00196 inches pk-pk. Converting to mils pk-pk, this would be 1.96 mils pk-pk.
Acceleration amplitude:

The formula for acceleration amplitude is acceleration amplitude = (velocity amplitude x f)2.
In this case, the acceleration amplitude would be (0.23 ips x 1170 cpm)2 = 546.7 g.

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Celestial navigation is the best method of naming or locating stars, if we have to give someone the location of a star.

With the help of "sights" or time angular measurements taken typically between a celestial body (e.g. the Sun, a planet, the moon or a star) and the visible horizon, Celestial navigation locate a star or any celestial body. However it can also take advantage of measurements between celestial bodies without taking the Earth horizon as reference, such as when the Moon is used in the practice, then it is called "lunars" or lunar distance method, which is used for determining precise time when time is unknown.

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The driver gear is the gear that provides the input motion to the gear train, while the driven gear is the gear that receives motion from the other gears in the train and provides the output motion.

This refers to the main or primary gear that majorly drives the other gears found in the gear train.The driver gear is typically connected to a power source, such as an electric motor or a combustion engine, while the driven gear is connected to the load that the gear train is intended to drive. The driver gear is also the one that has the greater torque and the one that rotates faster.

Driven gears refer to the gear that receives motion from the other gears in the train and provides the output motion.

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The definition of a planet according to the ancient Greeks is an object that orbits the sun.

Massive, circular celestial objects that are neither stars nor their remnants are known as planets. The planetary nebulae hypothesis, that states that an interstellar cloud bursts out of a nebulae to produce a young protostar encircled by a protoplanetary disc, is currently the most promising theory for planet formation. The steady accretion of matter accelerated by gravity, or accretion, is how planets expand within this disc.

Sun's core undergoes nuclear fusion events, transforming it into a nearly perfect ball of hot plasma that is incandescent. The Sun is the most significant source of energy for life on Earth, radiating this energy mostly as light, uv, and infrared rays.

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In order to calculate time, we need to know one more variable, the gravitational acceleration of earth which is 9.8 m/s^2 and the force exerted on the player's legs, which can be calculated by F=ma.

In order to determine how long the player will remain in the air, we would need to know the player's upward acceleration (which can be affected by factors such as the player's mass and the force exerted on the player's legs as they jump) as well as the player's initial upward velocity. Without this information, it is not possible to calculate how long the player will remain in the air.

In physics, an object's vertical motion can be described by the equation:

y = vi*t + (1/2)at^2

where y is the vertical displacement (or height) of the object, vi is the initial upward velocity, t is the time in the air, and a is the upward acceleration.

If we know the initial upward velocity (vi) and the acceleration (a), we can use this equation to solve for the time in the air (t). The acceleration of the object is determined by various factors such as the force applied on the object and the mass of the object.

In this case, we know the initial upward velocity of the basketball player is 3.53 m/s, but we don't have the acceleration value, which means we cannot solve for time. In order to calculate time, we need to know one more variable, the gravitational acceleration of earth which is 9.8 m/s^2 and the force exerted on the player's legs, which can be calculated by F=ma.

Therefore, without additional information, it is not possible to calculate the time the player will remain in the air.

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Answer:

they have the same atoms

The pressure of the fluid inside the heart chamber gets increased when the heart chamber contracts.

A typical heart has 4 chambers, two upper and two lower chambers. The upper two chambers, the right and left, receive incoming blood. The lower two chambers, the more muscular right and left, pump the blood out of the heart. The heart valves, which maintain blood flowing in the right direction, are gates at the chamber openings. We know when a closed chamber which is filled with a fluid is compressed, the fluid inside the chamber tries to come out of the chamber. Which increases the blood pressure in case of a heart chamber.

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The area of each plate must be 2.6 x 10^-9 m^2 in order to achieve an electric field of 2.0 kV/mm between the plates.

Electric field is a physical quantity that is used to describe the force that an electric charge exerts on other charges in its vicinity. It is a vector field, meaning it has both magnitude and direction. Electric fields are created by electric charges, or by time-varying magnetic fields.

The electric field (E) between the plates of a capacitor is equal to the charge (Q) divided by the area (A) of the plates:
E = Q/A
We can rearrange this equation to solve for A:
A = Q/E
Since the charge on the plates is 5.2 microcoulombs (5.2 x 10^-6 C) and the electric field desired is 2.0 kV/mm (2.0 x 10^3 V/mm), we can plug in these values to find A:
A = 5.2 x 10^-6 C/2.0 x 10^3 V/mm = 2.6 x 10^-9 m^2
Therefore, the area of each plate must be 2.6 x 10^-9 m^2 in order to achieve an electric field of 2.0 kV/mm between the plates.

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(i) The power wasted in heating the wire if the current in part (a) flows in the wire is 53.8 MW.

(ii) The power wasted in heating the wire if the current in part (b) flows in the wire is 17,800 MW.

The value of the power wasted in heating the wire is calculated by applying the following formula.

P = I²R

where;

For the first case when the resistance, R = 9 Ω and current, I = I,

The power wasted is calculated as;

P = I² x 9

P = 9I²

For 22 kV, the current, I = (22,000 V) / 9 Ω

I = 2,444.44 A

P = 9 x (2,444.44)²

P = 5.38 x 10⁷ W

P = 53.8 x 10⁶ W

P = 53.8 MW

For the second case when the resistance, R = 9 Ω and current, I = I,

The power wasted is calculated as;

P = I² x 9

P = 9I²

For 400 kV, the current, I = (400,000 V) / 9 Ω

I = 44,444.44 A

P = 9 x (44,444.44)²

P = 1.78 x 10¹⁰ W

P = 17,800 x 10⁶ W

P = 17,800 MW

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Answer:

La galvanoplastia o electrodeposición es una aplicación práctica de la electroquímica. Se trata de una técnica basada en los principios electroquímicos, en donde se aplica una o varias capas de un metal seleccionado sobre un objeto receptor, por lo general, también metálico.

Explanation:

Espero te sirva de algo ;)

The amount of the potential energy that was converted into thermal energy  is determined as 440,000 J.

The amount of the potential energy that was converted into thermal energy  is calculated by applying the principle of conservation of energy as follows;

P.E - K.E = Eth

where;

( 2,000 kg x 9.8 m/s² x 150 m ) - ¹/₂ (2,000 kg )( 50 m/s )² = Eth

2,940,000 J - 2,500,000 J = Eth

440,000 J = Eth

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The least speed is required to cover the rest of the trip to arrive in time for the interview is [tex]114.05km/hr[/tex]

Distance and displacement are two quantities that seem to mean the same but are distinctly different with different meanings and definitions. Distance is the measure of “how much ground an object has covered during its motion” while displacement refers to the measure of “how far out of place is an object.”

Here distance formula is,

Δ[tex]d=d_{1} +d_{2}[/tex]

Here we need to find the time left and the distance covered:

T[tex]1[/tex] [tex]=\frac{100}{100}=1hr=60 min[/tex]

T[tex]2[/tex] [tex]=\frac{43}{41} =1.04hr=62.92 min[/tex]

Total time was [tex]3.25hr[/tex][tex]=195min[/tex]

So, Time left is: [tex]1.21hr =72.08min[/tex]

Total distance left to cover is:

D[tex]=280-100-43=137[/tex][tex]km[/tex]

Now minimum speed required is:

[tex]s=\frac{distance}{time} =\frac{137}{1.21} =114.05km/hr[/tex]

Therefore, the least speed is required to cover the rest of the trip to arrive in time for the interview is [tex]114.05 km/hr[/tex].

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Complete question: you are to drive to an interview in another town, at a distance of 280km on a expressway. The interview is at 11:15 a.m. you plan to drive at 100km/h, but then construction work forces you to slow to 41.0km/h for 43.0km what would be the least speed needed for the rest of the trip to arrive in time for the interview?

The average velocity of the car is 40m/s

The average velocity of an object can be determined by dividing the change in position by the change in time.

For this situation, the vehicle begins from rest (initial velocity of 0 m/s) and arrives at a final velocity of 80 m/s.

We can use the equation:

Average velocity = (final velocity + initial velocity) / 2

Average velocity = (80 m/s + 0 m/s) / 2

Average velocity = 40 m/s

This is the average velocity of the vehicle during the entire time interval. Remember that this isn't equivalent to the instantaneous velocity at one point in time, which can be not quite the same as the average velocity.

It's important to take note of that on the off chance that the vehicle's speed increase isn't constant, the average velocity won't rise to the final velocity in addition to the initial velocity isolated by two.

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The distance that the support must be from point A . 1.2010 3 N.

At x = 0, where the x axis is parallel to the diving board, we assume the force acting on the left pedestal to be F1. We define the right pedestal's force as F2 and its location as x=d. W is the diver's weight, which is found at x=L. Setting the total of forces (with upward positive) and the sum of torques (around x2) to zero yields the following two equations:

F 1 +F 2 −W=0

F 1 d+W(L−d)=0

(a) The result of the second equation is F 1 = d L d W = (2.5m 3.0m)

(600N) = 800N, which should be rounded to F 1 = 1.210 3 N. Consequently, F 1 = 1.2010 3 N

(b) F 1 is negative, suggesting a downward force.

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The cost of making toast 16 times per month at a rate of 9.0 cents/kWh is approximately $0.1 per month.

How does the energy consumption of a device change with the length of usage?

The strength consumption of a tool commonly will increase with the duration of utilization. This is due to the fact maximum devices devour electricity continuously at the same time as in use, no matter how long they're used for. Some gadgets, along with appliances with standby or sleep modes, may devour less strength while now not in use, but will eat extra strength the longer they're used. For example, a fridge will consume extra power over a month than it will over an afternoon, and a pc will devour more energy over a 12 months than it's going to over a month.

A few gadgets, consisting of incandescent light bulbs, will eat extra energy and put on out faster the greater they may be used.

We convert from Watt to kilowatt

650/1000 = 0.65KW

We convert from minutes to hour:

6/60= 0.1 hr

Convert cents to dollars

9/100 = $0.09

Energy cost in KWh= 0.65 × 0.1 × 0.09 ×16= $ 0.1 per month

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At the height 2650 km, the value of acceleration due to gravity is 50% of its value at the surface.

The new value of gravity at a height h is given as g' = g R²/(R+h)²

As visible from the formula, increasing h results in decreasing gravity.

So, just put g′ = g/2 i.e. 50% less than g where g is gravity at surface. So, we get,

g/2 = g R²/(R+h)²

1/2 = R²/(R+h)²

2/1 = (R+h)²/R²

√2 = (R+h)/R = 1 + h/R

h/R = √2 - 1 = 0.414

h = 0.414 R

As we know radius of the earth = 6400 km, putting it in the above equation,

h = 0.414 R = 0.414(6400) = 2649.6 km

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The magnitude of the net electric field now at a point 15.5 cm due east of the charge is 1721.15 N/C.

The physical field that surrounds electrically charged particles and pulls or attracts all other charged particles in the vicinity is known as an electric field. The physical field for a system of charged particles is another usage of the term.

Conductive materials are affected by electric fields, which change how electric charges are distributed at their surface. As a result, current travels through the body and to the ground. Circulating currents are induced within the human body by low-frequency magnetic fields.

A uniform electric field of 1350 n/c is already given,

[tex]E_1 = 1350[/tex]

Now, for the point charge, By Coulomb's law,

We get,

[tex]E_2=\frac{Kq}{r^{2} }[/tex]

here, [tex]K = 9*10^{9}[/tex]

According to the question,

[tex]q=2.85*10^{-9} C[/tex]

[tex]r = 0.155 m[/tex]

Putting these values in the formula,

We get,

⇒ [tex]E_2=\frac{(9*10^{9})*(2.85*10^{-9} ) }{(0.155)^{2}}[/tex]

⇒ [tex]E_2= 1067.6 N/C[/tex]

Now,

the net electric field,

⇒ [tex]E = \sqrt{(E_1^{2})+(E_2)^{2} }[/tex]

⇒ [tex]E=\sqrt{(1067.6)^{2} +(1350)^{2} }[/tex]

⇒ [tex]E= 1721.15 N/C[/tex]

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