8. You were told that on top of the skyscraper that you are in, the gravitational potential energy at the top is 1 MegaJoule. If this was measured relative to an average person weighing 65 kg, how high is the skyscraper? a. 156.8 m b. 657.2 m c. 1568 m d. 6572 m
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- QUESTION 5 A 12 Kg bowling ball is held 3 meters above the ground at sea level. Assuming that acceleration of gravity is 10 m/s^2, calculate the gravitational potential energy of the bowling ball. a. 36 J. b. 144 J. c. 10 J. d. 360 J. e. 12 J.29. A 75.0-kg skier rides a 2830-m-long lift to the top of a mountain. The lift makes an angle of 14.6° with the horizontal. What is the change in the skier's gravitational potential energy?7. A 59 kg snowboarder descends a 13 km ski hill from the top of a mountain to the base (Figure 4). The slope is at an angle of 14° to the horizontal Determine the snowboarder's gravitational potential energy relative to the mountain base when she is at the top. 1.3 km 8=14 Drawing not to scaie
- Identify each situation as: WORK IS DONE or WORK IS NOT DONE a.A teacher applies force to a wall and becomes exhausted. b.A book falls off the table to the ground. c.A rocket accelerates through space7. The work done by gravity in lowering a 3.0 [kg] box from an initial height to the ground is 15 [J]. What is the gravitational potential energy at its initial position if the potential energy at the ground is zero? A. zero B. -15.0 [J] C. +15.0 [J] D. +30.0 [J]You take a 13kg bag of lead pellets and drop it from 2m above the ground.a. How much gravitational potential energy does the bag have when held 2m above the ground?b. The bag is dropped. Just before it hits the ground, how much kinetic energy does it have?c. How fast is the bag moving just before it hits the ground?d. When it hits the ground, the kinetic energy will be transformed mostly into thermal energy. If 40%of this energy goes into the lead pellets as heat, what will be the increase in temperature of thelead? Assume led has a specific heat capacity of 160J/kg·K.
- 2. A ball is dropped from the top of a building. You choose the top of the building as a reference point while your friend chooses the bottom as the reference point. Explain whether the energy calculated using the two different reference points are same or different. a. The ball PE at any point b. Change in PE as a result of the fall KE at any point C.How much work (in J) must be done to lift a stack of bricks, which has a mass of 50 kg, from the ground to a height of 6 m? (g = 10 m/s?) A. 300J B. 500 J C. 3,000) D. 5,000J E. zero JChoose all that apply to potential energy. A. Potential energy can be negative. B. Potential energy is measured in the units of Joules. C. Energy that something possess because of its position. D. Potential energy is measured in the units of Nm.
- 2. A 3.2 kg ball that is moving straight upward has 17 J of kinetic energy and its total mechanical energy is 25 1. a. Find the gravitational potential energy of the ball. b. What is its height above the ground? c. What is the speed of the ball? d. What will be its gravitational energy when it is at Its highest point above the ground? e. What is the maximum height above the ground? f. What will be its speed Just before it lands on the ground? and Given: quired: ution:45.) Which of the following would describe gravitational potential energy? a. a book sitting on a shelf b. a rubber band stretched in an upward direction c. an apple sitting on the countera. Gravitational potential energy and mechanical energy Ob. Potential energy and mechanical energy c. Gravitational potential energy and kinetic energy Od. Potential energy and kinetic energy Clear my choice When a stone is dropped from a bridge to a river below, what happens to the gravitational potential energy halfway down? f 2 Select one: O a. The stone has half the amount of gravitational potential energy and double the amount of kinetic energy. O b. The stone has half the amount of gravitational potential energy and half of it has been converted to kinetic energy. O C. The stone gains momentum, and its potential energy decreases and its kinetic energy increases. O d. The stone gains momentum, and its potential energy decreases. Jamie pulls an elastic band that has a spring constant of 45 N/m, producing a 3.0 J increase in potential energy. How far did Jamie hp