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Compressions and rarefactions are characteristics of  

For a scientific hypothesis to be valid, there must be a test for proving it  

Both a transverse wave and a longitudinal wave have  

Sound travels faster in air if the air temperature is  

A high-frequency sound source produces a high  

Just as a sustained flow of water in a hydraulic circuit needs a pump, in electric circuits the flow of charge needs  

The mass of a ball moving at 3 m/s with a momentum of 48 kg m/s is  

An object that has kinetic energy must be  

A 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. The recoil velocity of the rifle is about (use conservation of momentum)  

A device that transforms electrical energy to mechanical energy is a