The___are most similar to earth

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

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.

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?