What is the primary energy transformation that occurs when a match is lit? a. electrical energy is transformed into heat and light. b. chemical energy is transformed into heat and light. c. chemical energy is transformed into electrical energy. d. heat and light are transformed into chemical energy.

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?

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.