What does "spectrum" mean?

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.

For most stars, what does a higher temperature tend to to with? a lower luminosity a higher luminositya red color none of the above

Which statement best describes what energy transfer diagrams show? energy can change form, but the total amount of energy stays the same. every energy transformation results in a reduction of energy energy transformations result in fewer types of energy each type of energy can change into one other type of energy