Ais used in car headlights. a. convex mirror b. concave lens c. plane mirror d. convex lens e. concave mirror

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

If an electric circuit is not grounded it is best to reach out and touch it to provide the ground a. true or b. false

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.