Calculate the angular speed of the hour’s hand of your watch.

What is the angular velocity of the hour hand of clock?

Show that the linear speed of a paricle rotaling alon a circular path is r times the angular speed of the particle.

A train whistling while approaching a railway platform with a speed of 90 km(s)^-1 .The frequency of sound of the whistle is 600 Hz.If the velocity of sound in air is 325 m(s)^-1 ,calculate the apparent frequency of the sound of the whistle as heard by an observer standing on the platform.

An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate, its speed if it takes 24 hours to revolve around the earth.

(a) A child stands at the centre of a turntable with his two arms outstretched. The turntable is set rotating with an angular speed of 40 rev/min. How much is the angular speed of the child if he folds his hands back and thereby reduces his moment of inertia to 2/5 times the initial value? Assume that the turntable rotates without friction. (b) Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?

A sonar device on a submarine sends out a signal and receives an echo 5 s later. Calculate the speed of sbund in water if the distance of.the object from the submarine is 3625. m

Calculate the molar mass of the following substances. Sulphur molecule, S_8

Calculate the angle of banking for a circlular track of radius R for vehicles moving with a speed v.