Question 1 Suppose you have a horizontal section of a pipe as shown below, where water is entering on side that
has a diameter of 0.5 m with a speed v = 6 m/s. The water leaves the pipe at the narrower section,
which has a diameter of 0.25 m. At what speed does water leave? (2 marks)​

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.