If a wheel 1.2 m in diameter rotates at one revolution per second, calculate the velocity of the wheel.

What is the frequency of vibration if the balance wheel of a wrist watch makes 90 revolutions in 25 s?

A motorcycle of mass 100kg moves round in a circle of radius 10m with a velocity of 5 ms-1. find the coefficient of friction between the road and the tyres.

I. The motion of the tyres of a moving car.
II. The motion of a loaded test tube oscillated
vertically.
III. The beating of the heart.
IV. A stone tied to a string and whirled round.
V. The motion of the pistons in a gasoline engine.
Which of the motions above is simple harmonic?

The wavelength of a wave traveling with a velocity of 420 ms-1 is 42 m. what is its period?