5000 j of heat are added to a system. it does 3500 j of work on the surroundings. what is δe in j?

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.