Multiple ChoiceA 500kg car is driving up a hill. What is the change in potential energy of the car when it undergoes a displacement of d⇀=(210m)i^+(2.0m)j^.298views
Textbook Question(I) By how much does the gravitational potential energy of a 58-kg pole vaulter change if her center of mass rises 4.0 m during the jump?107views
Textbook Question(II) A sphere of radius r₁ has a concentric spherical cavity of radius r₂ (Fig. 8–42). Assume this spherical shell of thickness r₁ - r₂ is uniform and has a total mass M. Show that the gravitational potential energy of a mass m at a distance r from the center of the shell ( r > r₁ ) is given by U = - (GmM/r). <IMAGE>124views
Textbook QuestionThe free-fall acceleration on a large asteroid, in the vacuum of space, is 0.15 m/s^2. A spacecraft hovering 500 m above the surface drops a 25 kg payload wrapped in a padded jacket. What is the payload's impact speed?527views
Textbook Question(II) A 66.5-kg hiker starts at an elevation of 1150 m and climbs to the top of a peak 2660 m high. (a) What is the hiker’s change in potential energy? 69views
Textbook QuestionA uniform 2.00-m ladder of mass 9.00 kg is leaning against a vertical wall while making an angle of 53.0° with the floor. A worker pushes the ladder up against the wall until it is vertical. What is the increase in the gravitational potential energy of the ladder?61views