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College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Belly-flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000 J (relative to the surface of the pool). What is his kinetic energy when his potential energy reduces to 1000 J?
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- A 40 N object has 80 joules of potential energy. The object is at a height of 0.5 meters. True or falsearrow_forwardYou throw a 2.3 kg ball straight up into the air and catch it again in your hands. Where in the ball's flight is its potential energy at a maximum?arrow_forwardKaren lifts a 10.0 kg box up from the ground to a height of 1.50 meters. He then lowers the box to 0.630 m above the ground. What is the change in potential energy of the box in Joules? change in potential energy between final and inital height.arrow_forward
- A 76.0-kg hiker is descending a mountain that has a peak altitude of 2350 m above sea level. The hiker has a device that measures her potential energy, and when she is at the peak of the mountain she decides to "zero" it (that is, she set's the zero point of potential energy to be the mountaintop). What does her potential energy device read sometime later on her descent when she is 1960 m above sea level?arrow_forwardA car with a mass of 2000 kg starts at rest from a point 30 m above the ground. At point B, it is 15 m above the ground. If the initial kinetic energy was zero and the work done against friction between the starting point and point B is 20 000 J, what is the kinetic energy of the car at point B? (g= 10 m/s2).arrow_forwardThe energy needed to increase the speed of a certain car from 22 m/s to 54 m/s is 2900 kJ. A) What is the mass of the car? B) At what speed is the cars kinetic energy equal to 1500 kJ? C) The car is driven up pikes Peak, an elevation gain of 5500 feet from the base. What is the change of potential energy of the car? give the answer in Joules. arrow_forward
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