Three hundred joules of heat are added to a system. The system uses 140 joules to do work.
By how much did the internal energy of the system
change?
O 140J
O 160J
0 240 J
O 440J

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?

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.

How does an increase in temperature generally affect the rate of a reaction?