A piston has an area of 4 m2 and needs 20 N of force to push it down. What is the pressure?P=F/A * A) 5 Pa
B) 0.2 Pa
C) 80 Pa
D) 20 Pa

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A15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°c to 175°c. what is the specific heat capacity of iron?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

Ajoint produces movement when its angle decreases. which type of movement is it?