Electromagnetic waves are composed of

repelling electrons and neutrons

protons emitted by stationary electrons

photons emitted by moving electrons

protons and neutrons

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage

What was the first instrument to ever record an earthquake?

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?