How do car brakes work i am confused on what kind of friction these pads have effect on the wheels

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Atwo-stage air compressor operates at steady state, compression 10m^3/min of air from 100 kpa and 300k to 1200 kpa. an intercooler between the two stages cools the air to 300k at a constant pressure of 350 kpa. the compression processes are isentropic. a) calculate the power required to run the compressor, in kw b) compare the result to the power required for isentropic compression from the same inlet state to the same final pressure.

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form