Question

32A

A married couple (of different mass) are motionless and hugging on an icy pond with negligible friction. After some ill-advised words from each, each shoves the other away. Identify the true statement.

	A.	The speeds of the two people are equal.
	B.	The less massive person has a smaller initial acceleration than the more massive person.
	C.	The center of mass of the two-person system is stationary.
	D.	The kinetic energies of the two people are equal.
	E.	The momenta of the two people are equal.

32B

A girl pushes horizontally on a lawnmower of mass m such that it moves with a constant speed v across a driveway on the horizontal plane. The coefficient of friction between the lawnmower and the driveway is μ. Calculate the rate that the girl converts chemical energy into heat.

	A.	mgv
	B.	mmv2
	C.	mmgv
	D.	mg/v
	E.	mmg/v

Answer 1