If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 477j of energy to the room?

477 joules of heat was taken away from the food kept in the refrigerator.

Explanation:

According to the law of thermodynamics which is inferred from the law of energy conservation, energy can neither be created nor be destroyed but it can be transformed from one to another.

Hence when 477 j of energy was released into the room by refrigerator, it means 477 j of heat was removed from the food kept inside the refrigerator.

the answer would be a

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s