If 60 waves of a sound pass by point within two minutes what is the frequency of that sound in hertz

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

If you put a helium-filled balloon in the refrigerator, what will happen?

The drag force, fd, imposed by the surrounding air on a vehicle moving with velocity v is given by fd = cdaρv 2/2 where cd is a constant called the drag coefficient, a is the projected frontal area of the vehicle, and ρ is the air density. an automobile is moving at v = 80 kilometers per hour with cd = 0.28, a = 2.3 m2, and ρ = 1.2 kg/m3.