Jenny's model train is set up on a circular track. there are six telephone poles evenly spaced around the track. it takes the engine of her train 10 seconds to go from the first pole to the third pole. how long would it take for the engine to go the entire distance around the track?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

(a) if the pressure in gas is doubled while its volume is held constant, by what factor do (i) vrms and (ii) change? (b) is it possible to boil water at room temperature (20oc) without heating it? explain.

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.