Consider air entering an ADIABATIC chamber at a rate of 100 lbm/s at 1 atm and 70°F (note non-absolute temperature scale). The air leaves this chamber at 20 atm. Suppose that the kinetic energy in the flow stream is negligible (i. e. u1 ≈ u2 ≈ 0). Determine: (a) exit temperature T2 and specify whether this is a minimum or a maximum temperature value and (b) amount of horsepower associated with this process and specify whether it is input or output.

Atruck going 15 kmôź°€h has a head-on collision with a small car going 30 kmôź°€h. which statement best describes the situation? (a) the truck has the greater change of momentum because it has the greater mass. (b) the car has the greater change of momentum because it has the greater speed. (c) neither the car nor the truck changes its momentum in the collision because momentum is conserved. (d) they both have the same change in magnitude of momentum because momentum is conserved. (e) none of the above is necessarily true. 2. a small boat coasts at constant speed under a bridge. a heavy sack of sand is dropped from the bridge onto the boat. the speed of the boat (a) increases. (b) decreases. (c) does not change. (d) without knowing the mass of the boat and the sand, we can’t tell.