You have a small tank of water. suppose you make waves in the tank, and measure their speed in different depths of water. which is the independent variable, and which is the dependent variable?

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.