7. A block of mass 2.0 kg rests on a table. If its gravitational potential energy is 150 J now, how high is the table? a. 0.765 m b. 7.65 m c. 30 m d. 300 m
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- 2. A 900 kg elevator is raised by an electric motor up from the basement to the third floor, a vertical distance of 9.9 m, over the course of 5 s. There's a friction force of 125 N between the elevator and the elevator shaft. A. Draw a free body diagram of the elevator. Which forces are conservative? Which forces are dissipative? Which are external? B. How much potential energy does the elevator gain as its lifted? C. What is the work done by friction on the elevator? Is it positive or negative?If the speed of a particle is doubled, what happens to its kinetic energy? a. It will be half. b. It will be square root of twice as large. c. It will be four times bigger. d. It does not change e. It will be twice as big.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.
- An object with mass m and a velocity v. What happens to Kinetic Energy when velocity is doubled? a. stays the same b. quadrupled c. halved d. doubled e. not enough info5. What is the kinetic energy of a box of mass 0.75 [kg] sliding on a frictionless surface at a constant speed of 3.00 [m/s]? A. 1.46 [J] B. 2.25 [J] C. 4.50 [J] D. 3.38 [J]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 space
- Choose 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:What is the kinetic energy of a 1400 kg car traveling at 5,35 7.4x 10 J 2.0x 10 J C. 7.3x 10 J 2.8 x 107 J
- A car is accelerated from velocity v1 to v2 in the time period of t . The mass of the car is m. The inclined angle of the hill is α. The distance travelled along the hill is L. The vertical distance travelled is H. Select the equation used to calculate the potential energy increase of the car ΔPE______ A. B. ΔPE=mgH C. ΔPE=mgL D.6. Two blocks are connected by a very light string passing over a massless, frictionless pulley (see figure). Traveling at a constant speed, the 20.0-N block moves 65.0 cm to the right and the 12.0-N block moves 65.0 cm down. How much work is done a. on the 12.0-N block by gravity? b. on the 12.0-N block by the tension in the string? in total on the 12.0-N block? C. d. on the 20.0-N block by gravity? on the 20.0-N block by the tension in the string? on the 20.0-N block by the normal force? on the 20.0-N block by friction? in total on the 20.0-N block? e. f. g. h. 20.0 N 12.0 NWhat is the best description of gravitational potential energy? a. The energy stored, dependent on the object's height from the ground. b. The strength from a moving object. c. The energy exerted through stretching or squashing an object. d. The strength stored between molecules, in chemical bonds.