1. A bar of metal has a mass 200 g and a certain weight Mass remains the same when weighted at equator but weight decreases. Why?
2. Differentiate between mass and weight. Write any three differences.
3. How many Newtons are there in Ikg weight?
4. Give reason:
(a) A piece of paper takes much longer to fall than a stone through the same distance,
when both are dropped simultaneously from roof.
(b) The mass is constant everywhere whereas the weight keeps changing.
(e) The value of g keeps changing as we move away from the earth whereas value of G
remains constant all over the universe?
5. The gravitational force between two objects is 100N. How should the distance between
the objects be changed so that force between them becomes 50N?

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?