Which of the following objects has elastic potential energy? A diver standing on a diving platform.
A hockey puck gliding across the ice.
An archers bow that is drawn back.
A runner waiting on the starting blocks.

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

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.