Ch 8 – Energy & Work - Learn Conceptual Physics

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Ch 8 – Energy & Work! Work, Energy, Power! “Work,” “energy,” and “power” ... These words have very specific meanings in physics; you’ll need to be careful not to mix up the two ways of speaking.! Definition of Work!!!! Note that the Force and the displacement have to be in ... I lift a 8-kg bowling ball up 50 cm into the air ...

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Ch 8 – Energy & Work - Learn Conceptual Physics Ch 8 – Energy & Work - Learn Conceptual Physics
Ch 8 – Energy & Work! Work, Energy, Power! “Work,” “energy,” and “power” ... These words have very specific meanings in physics; you’ll need to be careful not to mix up the two ways of speaking.! Definition of Work!!!! Note that the Force and the displacement have to be in ... I lift a 8-kg bowling ball up 50 cm into the air ...
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Physics Worksheet Work and Energy Section: Name: Mr. Lin 1 Show all work for the following questions, including the equation and substitution with units. 1. An 80 N force has been applied to a block and move it 20 m along the direction of the force. How much work has been done to the block? 2.
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How much work is done ... Assume no friction. The mass of the block is 10.0 kg. Since the problem involves a change in height and speed, we make use of the generalized Work­Energy Theorem, WNC = E = P ... surface where it passes over a 2.00­m rough patch.
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A spring-loaded toy dart gun is used to shoot a dart straight up in the air, and the dart reaches a maximum height of 24 m. The same dart is shot straight up a second time from the same gun, but this time the spring is compressed only half as far as before firing. How far up does the dart go this time, neglecting friction and assuming an ideal ...
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14. Suppose that you have a mass of 62.0 kg and that you walk to the top of a stairway which is h = 12.0 meters high and L= 15.0 meters deep. a. How much work will you have to do in walking to the top of the stairway? Ans. To get to the top of the stairs, W = F d=mgh = 62.0 kg . . 12 m =7291.2 J b.
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22.) A spring with k=53 N/m hangs vertically next to a ruler. The end of the spring is next to the 15 cm mark on the ruler. If a 2.5 kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks? 23.) A novice skier, starting from rest, slides down a frictionless 35.0º incline whose vertical
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AP Physics 1 - Energy, Work, and Power Practice Test (Multiple Choice Section) Directions: Mark only one answer for each question. Use g = 10 m/s2 for simplicity. 1. Weightlifter A lifts a 50 kg mass 1 m above the ground. Weightlifter B lifts an identical 50 kg mass 2 m above the ground.
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previous page, all five joules of input work were transformed to five joules of output work. An engineer would say the machine was 100 percent efficient, because all the input work became output work and none was lost. How friction affects real machines In real machines, the work output is always less than the work input.
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Work and the Work/Kinetic Energy Theorem Potential Energy. ... The definition of work W =F Δx corresponds to the intuitive idea of effort: • More massive object will require more work to get to the same ... Use the work-kinetic energy theorem: x v = 10 m/s m = 25 kg k = 3000 N/m
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7. Can an object reverse it direction of travel while maintaining a constant acceleratio5. Can an give an example. If not, explain why. Ans. Yes. A ball thrown straight up will rise and then reverse its direction and fall. All the while, it will have a constant acceleration of 10 m/s/s down. 8. You are driving north on the highway.
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When no air resistance acts on a fast-moving baseball, its acceleration is A. downward, g. B. a combination of constant horizontal motion and accelerated downward motion. C. opposite to the force of gravity. F. centripetal. Projectile Motion CHECK YOUR ANSWER
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10) A hockey puck sliding across the ice finally comes to rest because A) it seeks its proper and natural state. B) of friction. C) that's just the way it is. Answer: B Diff: 1 Topic: Galileo's Experiments 11) A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are
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2. A 70. kg pole vaulter converts the kinetic energy of running at ground level into the potential energy needed to clear the crossbar at a height of 4.0 m above the ground. What is the minimum velocity that the pole vaulter must have when taking off from the ground in order to clear the bar? Answer: s 8.9m

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