1. An object with a mass of 2.50kg is placed on a table top that is 0.95m high. Then it is raised onto a shelf 1.5m from the table top. A. What is the gravitational potential energy of an object relative to the table top? a. 75.36 J b. 57.63J c. 36.75 J d. 40.57 J B. What is the gravitational potential energy on an object relative to the floor? e. 60.025 J f. 68.521 J g. 66.252 J h. 25.060 J

1. An object with a mass of 2.50kg is placed on a table top that is 0.95m high. Then it is raised onto a shelf 1.5m from the table top. A. What is the gravitational potential energy of an object relative to the table top? a. 75.36 J b. 57.63J c. 36.75 J d. 40.57 J B. What is the gravitational potential energy on an object relative to the floor? e. 60.025 J f. 68.521 J g. 66.252 J h. 25.060 J

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter8: Conservation Of Energy

Section: Chapter Questions

Problem 67PQ: The Earths perihelion distance (closest approach to the Sun) is rp = 1.48 1011 m, and its aphelion...

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The Earths perihelion distance (closest approach to the Sun) is rp = 1.48 1011 m, and its aphelion distance (farthest point) is rA = 1.52 1011 m. What is the change in the SunEarths gravitational potential energy as the Earth moves from aphelion to perihelion? What is the change in its gravitational potential energy from perihelion to aphelion?
(a) How much gravitational potential energy (relative to the ground on which it is built) is stored in the Great Pyramid of Cheops, given that its mass is about 7109 kg and its center of mass is 36.5 m above the surrounding ground? (b) How does this energy compare with the daily food intake of a person?
In each situation shown in Figure P8.12, a ball moves from point A to point B. Use the following data to find the change in the gravitational potential energy in each case. You can assume that the radius of the ball is negligible. a. h = 1.35 m, = 25, and m = 0.65 kg b. R = 33.5 m and m = 756 kg c. R = 33.5 m and m = 756 kg FIGURE P8.12 Problems 12, 13, and 14.
. In the annual Empire State Building race, contestants run up 1,575 steps to a height of 1,050 ft. In 2003, Australian Paul Crake completed the race in a record time of 9 min and 33 S, Mr., Crake weighed 143 lb (65 kg) , (a) How much work did Mr., Crake do in reaching the top of the building? (b) What was his average power output (in ft-lb/s and in hp)?
One person drops a ball from the top of a building while another person at the bottom observes its motion. Will these two people agree (a) on the value of the gravitational potential energy of the ball-Earth system? (b) On the change in potential energy? (c) On the kinetic energy of the ball at some point in its motion?
A toy cannon uses a spring to project a 5.30-g soft rubber ball. The spring is originally compressed by 5.00 cm and has a force constant of 8.00 N/m. When the cannon is fired, the ball moves 15.0 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.032 0 N on the ball. (a) With what speed does the projectile leave the barrel of the cannon? (b) At what point does the hall have maximum speed? (c) What is this maximum speed?
. At NASA's Zero Gravity Research Facility in Cleveland, Ohio, experimental payloads fall freely from rest in an evacuated vertical shaft through a distance of 132 m, (a) If a particular payload has a mass of 45 kg, what is its potential energy relative to the bottom of the shaft? (b) How fast will the payload be traveling when it reaches the bottom of the shaft? Convert your answer to mph for a comparison to highway speeds.
(a) Can the kinetic energy of a system be negative? (b) Can the gravitational potential energy of a system be negative? Explain.
A 60.0-kg athlete leaps straight up into the air from a trampoline with an initial speed of 9.0 m/s. The goal of this problem is to find the maximum height she attains and her speed at half maximum height. (a) What are the interacting objects and how do they interact? (b) Select the height at which the athletes speed is 9.0 m/s as y = 0. What is her kinetic energy at this point? What is the gravitational potential energy associated with the athlete? (c) What is her kinetic energy at maximum height? What is the gravitational potential energy associated with the athlete? (d) Write a general equation for energy conservation in this case and solve for the maximum height. Substitute and obtain a numerical answer. (e) Write the general equation for energy conservation and solve for the velocity at half the maximum height. Substitute and obtain a numerical answer.
6. A fully dressed astronaut, weighing 1.2 x 103 N on Earth, is about to jump down from a space capsule that has just landed safely on Planet X. The drop to the surface of X is 2.8 m, and the astronaut's gravitational potential energy relative to the surface is 1.1 × 10³ J. (a) What is the magnitude of the gravitational field strength on Planet X? (b) How long does the jump take? (c) What is the astronaut's maximum speed?
A 415kg satellite orbiting the earth experiences 215N of gravitational force from the Earth. (RE=6.38x106m, ME=5.97x1024kg). A. How high is the satellite above the Earth's surface? B. What is the potential energy of the satellite relative to the Earth's surface?
A satellite has a mass of 94 kg and is located at 2.04 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? J(b) What is the magnitude of the gravitational force on the satellite?