A2m3 rigid tank initially contains air (r=0.287 kj/kg. k) at 100 kpa and 22 oc. the tank is connected to a supply line through a valve. in the supply line, air is flowing at 600 kpa and 22 oc. the valve is opened and air is allowed to enter the tank until the tank pressure reaches the same pressure of the supply line at which point the valve is closed. a thermometer is placed in tank and read 77 oc once the valve is closed. determine: a) the mass of air entered the tank b) the amount of heat transfer out of tank. note: you can use either air tables or (cp = 1.005 kj/kg. k & cv = 0.718 kj/kg. k)

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.