As 390 g of hot milk cools in a mug, it transfers 30,000 j of heat to the environment. what is the temperature change of the milk? the specific heat of milk is 3.9 j/g•°c. show your work.

To practice problem-solving strategy 10.1 for energy conservation problems. a sled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slides a distance d1 down the slope and then covers the distance d2 along the horizontal terrain before stopping. find the coefficient of kinetic friction μk between the sled and the ground, assuming that it is constant throughout the trip.