Consider a 12ft x14ft x8 ft (height)room filled with motionless air. Assumingthe air pressure at the room ceiling of 14.7 psi and constant air densityof0.075 lbm/ft3, find(A)Pressure at the room floor(in psi); (B)Total force (in lbf) exerted by the air on the ceiling;(C)Total force (in lbf) exerted by the air on the floor;(D)Total weight (in lbf) of the air in the room. Compare your answers (B), (C) and (D)

Write the correct abbreviation for each metric unit

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)