Three objects of uniform density- a solid sphere, a solid cylinder, and a hollow cylinder- are placed at the top of an incline. they are all released from rest at the same elevation and roll without slipping. a) which object reaches the bottom first? b) which reaches it last? c) try this at home and note that the result is independent of the masses and the radii of the objects.

Are aliens real? justify you’re answer.

Ateam of astronauts is on a mission to land on and explore a large asteroid. in addition to collecting samples and performing experiments, one of their tasks is to demonstrate the concept of the escape speed by throwing rocks straight up at various initial speeds. with what minimum initial speed vesc will the rocks need to be thrown in order for them never to "fall" back to the asteroid? assume that the asteroid is approximately spherical, with an average density p 3.84 x108 g/m3 and volume v 2.17 x 1012 m3 recall that the universal gravitational constant is g 6.67 x 10-11 n m2/kg2

The image shows a pendulum in simple harmonic motion the pendulum starts at a and swing to e