Define the billiard ball and the edge of the pool table as the components of the system shown in Figure 5. Is it an isolated system? Is the total momentum of the system conserved after a collision of the billiard ball and the edge of the pool table?

May someone explain how to do this question?

Can someone explain to me how to do this problem ?

6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.