A.) a rock is dropped from the edge of a cliff 15.0 m high. how long does it take to reach the bottom of the cliff?

-b.) if the rock is projected horizontally from the same cliff with the initial speed of 2.5 m/s, how long does it take to reach the ground?

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

You have a pick-up truck that weighed 4,000 pounds when it was new. you are modifying it to increase its ground clearance. when you are finished

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.