At the instant that a tennis ball is launched horizontally from a tennis ball launcher with a large force, an identical ball is dropped from the same height. Assuming air resistance does not affect them, which ball will hit the ground first? A) neither, they would hit at the same time
B) the ball that was launched horizontally
C)
the ball that was launched horizontally

The junction rule describes the conservation of which quantity? note that this rule applies only to circuits that are in a steady state.

Which of these are physical changes in matter? check all that apply. boiling water a pencil being sharpened exploding dynamite freezing water rotting cheese

Atruck going 15 kmôź°€h has a head-on collision with a small car going 30 kmôź°€h. which statement best describes the situation? (a) the truck has the greater change of momentum because it has the greater mass. (b) the car has the greater change of momentum because it has the greater speed. (c) neither the car nor the truck changes its momentum in the collision because momentum is conserved. (d) they both have the same change in magnitude of momentum because momentum is conserved. (e) none of the above is necessarily true. 2. a small boat coasts at constant speed under a bridge. a heavy sack of sand is dropped from the bridge onto the boat. the speed of the boat (a) increases. (b) decreases. (c) does not change. (d) without knowing the mass of the boat and the sand, we can’t tell.