(a)
if the coconut weighs 1.5kg, and it is falling at 2m/s,
what is its momentum?

b)
at first the coconut speeds up as it falls. explain why in
terms of the forces acting on it.

(c)
explain what happens to the speed of the coconut
eventually (before it hits the ground) if the tree is very
tall.

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.