Which of the following demonstrates a change in weight only ? a. a rocket leaves the earth and lands on the moon b. a person changes from 100 kg to 75 kg after dieting c. 12 liters of oxygen is compressed to 4 liters d. an athlete adds 20 kg to the bar in the weight room

A. A rocket leaves earth and lands in the moon

Answers b and d are wrong because they change mass as well as weight
Answer c is wrong because it changes density

1) when you rub your hands together quickly, the kinetic energy is converted to mechanical energy.2) thermal energy from the sun travels to earth as infrared waves.3) energy is transferred through the matter of space by electromagnetic waves. 4) when a match is burned, chemical potential energy is converted to thermal and radiant energy. 5) seismicwaves are caused by back and forth movement , or vibration, of an object. 6) mechanicalenergy in an engine changes thermal energy into kinetic energy to make a car move.