What must be true if energy is to be transferred as heat between two bodies in physical contact? 1-The two bodies must have different volumes.

2-The two bodies must be at different temperatures.

3-The two bodies must have different masses.

4-The two bodies must be in thermal equilibrium.

Like a key in a lock, the shape of the. must bind with the. of the recieving neuron

The dot diagram represents the motion of the motorcycle as it moves from left to right

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.