A woman riding a ski lift with a constant velocity of 2.1 m/s up to the top of the hill suddenly hears a loud noise. As she turns to see a fighter jet doing acrobatics involving sharp turns, she accidentally knocks her skis off the lift. In the moment afterwards, which two objects have the same inertial frame of reference? A) the skier and her skis
B) the pilot and the jet
C) the skis and the ground
D) the skier and the lift

How much heat is needed to change the temperature of 3 grams of gold (c = 0.129 ) from 21°c to 363°c? the answer is expressed to the nearest whole number.

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)