A100 g aluminum calorimeter contains 250 g of water. the two substances are in thermal equilibrium at 10°c. two metallic blocks are placed in the water. one is a 50 g piece of copper at 66°c. the other sample has a mass of 71 g and is originally at a temperature of 100°c. the entire system stabilizes at a final temperature of 20°c. determine the specific heat of the unknown second sample.

Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.