An ideal blackbody is an object that .a. absorbs most of the energy that strikes it. b. only absorbs energy at ultraviolet ("black light") wavelengths. c. absorbs all the energy that strikes it. d. absorbs a little of the energy that strikes it. e. absorbs exactly half of the energy that strikes it.

Agymnast dismounts off the uneven bars in a tuck position with a radius of 0.3m (assume she is a solid sphere) and an angular velocity of 2rev/s. during the dismount she stretches out into the straight position, with a length of 1.5m, (assume she is a uniform rod through the center) for her landing. the gymnast has a mass of 50kg. what is her angular velocity in the straight position?

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f