Please help im failing this class and i have to get these answers right for my test. You can see the planets at night because

A. they produce their own light.

B. they reflect light from each other.

C. nuclear fusion takes place in their cores.

D. sunlight reflects from their surfaces.

Observations show that interstellar clouds can have almost any shape and

Ashot putter releases the shot some distance above the level ground with a velocity of 12.0 m/s, 51.0 ∘above the horizontal. the shot hits the ground 2.08 s later. you can ignore air resistance. how far did she throw the shot?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.