Calculate the net force for each of the following: a.
20 N to the right and 30 N to the right:

Stars x and y are both bluish main sequence stars. star x has a higher absolute brightness than star y. how do the two stars compare? explain

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

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.