In air and in water the same sound travels with different

 A sound wave is a/an

 Human hearing is best in

The time rate of work is

  An automobile and a bug traveling at the same speed collide head-on. The impact force is

The time rate of work is

When sound travels faster near the ground than above, bending of sound tends to be

A low frequency sound source produces a low

 When you push on a wall, you

When no forces act on moving objects their paths are normally