A downhill skier has her skis sharpened and waxed before every race. What effect would this have on her performance?

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

The human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information

If a star is moving toward earth, it is