ANALYZE In a vacuum chamber with no air resistance, would a feather and hammer dropped from the same height hit the ground at the same time? Explain your reasoning with evidence from your investigation.

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.