What would be Tom´s gravitational potential energy at the roof of the empire state building if it has an altitude of 1250 feet (380 meters) and his weight is equal to 600N?.

If a 1000 kg car is exiting a highway through an above-the-ground ramp of 5.0 m radius at 12 m/s, what is the potential energy?

A 2.50 kg mass is drop from rest. If it falls a distance of 25.0 m, what will its change in kinetic energy be? Assume only the gravitational force acts.

A 222 kg weather rocket reaches its maximum height 32 km above the Earth's surface. Determine a)The amount of gravitational potential energy at its maximum height.                              b) Its speed when it hits the ground (neglect frictional effects).

A student lifts a 1.26-kg book from her desk to a bookshelf. If the gravitational potential energy of the Book-Earth system increases by 9.10 J, how high is the bookshelf above the desk?

Q10 The planet Saturn has a mass of 5.70 x 1026 kg and a diameter of 139820 km. A satellite in orbit around Saturn has a mass of 400 kg and is in orbit 1600 km above the surface of the planet. What is the gravitational potential energy of the satellite? (A) -1.98 x 10'l J (C) -2.13 x 10l J (B) -2.07 x 10!" j (D) 2.13 x 10"J

Q26 A rocket is in orbit, distance R from the centre of the Earth. At this height it has gravitational potential energy (U) equal to -4E Joules. The rocket is then boosted to an orbit where its gravitational energy is -E. (a) Complete the table to show the missing values. Gravitational Orbital kinetic Total energy () potential energy () energy (J) Initial position -4E Final position -E (b) Explain how the gravitational potential energy of the rocket seems to decrease from -4E to -E even though it is boosted to a higher orbit. (c) Justify the change in kinetic energy of the Tocket by deriving the relationship between velocity of an orbiting object and the radius of its orbit.

(a) What is the gravitational potential energy of a two-particle system with masses 6.8 kg and 3.0 kg, if they are separated by 1.7 m? If you triple the separation between the particles, how much work is done (b) by the gravitational force between the particles and (c) by you?

A 77 kg bike racer climbs a 1400-m-long section of road that has a slope of 4.3 ∘∘ . By how much does his gravitational potential energy change during this climb?

A 31 kg bear slides, from rest, 10 m down a lodgepole pine tree, moving with a speed of 3.0 m/s just before hitting the ground. (a) What change occurs in the gravitational potential energy of the bear-Earth system during the slide? (b) What is the kinetic energy of the bear just before hitting the ground? (c) What is the average frictional force that acts on the sliding bear?