What is the best thing to do when conducting a experiment?

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Astring vibrates with a frequency of 10 hz. why can't a person hear the sound waves produced by the vibrating string, no matter how large the amplitude of the waves? out! this is homework and due tomorrow! you so much!