The theory that light exists in quantized "chunks" was proposed in response to which of the following? a. electron interference patterns b. the ultraviolet catastrophe c. discovery of planck's constant d. emission spectra

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

What is the coefficient of kinetic friction μk between the block and the tabletop?

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.