what is the radiation produced by electronic transitions in atoms and molecules, and is defined as being detectable by the human eye?

Disney, viacom and aol time warner are examples of

If a simple machine reduces the strength of a force, what must be increased?

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.