Ineed it right now when the burner in a hot air balloon is turned on, the temperature of the air in the balloon causing its volume to and the balloon a) decreases, expand, sink b) increases, expand, rise c) decreases, contract, rise d) increases, contract, sink

the answer is a. at the equator

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

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