If two objects are electrically attracted to each other: Group of answer choices the objects could be electrically neutral. one object must be negatively charged and the other object must be positively charged. both objects must be positively charged. both objects must be negatively charged. None of the above statements are absolutely true.

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

6–55 refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 358c at a rate of 0.018 kg/s and leaves at 800 kpa as a saturated liquid. if the compressor consumes 1.2 kw of power, determine (a) the cop of the heat pump and (b) the rate of heat absorption from the outside air.

To do work, this truck uses energy stored in chemical fuel and an electrical battery. how much total energy does this truck put out?