You are in a hot-air balloon that, relative to the ground, has a veloc- ity of 6.0 m/s in a direction due east. you see a hawk moving directly away from the balloon in a direction due north. the speed of the hawk relative to you is 2.0 m/s. what are the magnitude and direction of the hawk’s velocity relative to the ground? express the directional angle rel- ative to due east.

Which statements did both aristotle and ptolemy assume? check all that apply.

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.

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.