The angle through which the radius vector rotates in a given time is called

A particle is moving in a circle of radius R with constant speed v. If radius is doubled, then its centripetal force to keep the same speed gets.

A cosmonaut is orbiting earth in a spacecraft at an altitude h= 630km with a speed of 8kms^-1. If the radius of the earth is 6400 km, the acceleration of the cosmonaut is

Centrifugal force is a

A stone of mass 'm' tied to a string of length is rotated in a circle with the other end of the string as the centre. The speed of the stone is 'v'. If the string breaks, the stone will

A stone tied to one end of spring 80 cm long is whirled in a horizontal circle with a constant speed. If stone makes 25 revolutions in 14s, the magnitude of acceleration of stone is

In which unit is the Planck’s constant expressed?

A 500kg  car takes a round turn of radius 50m with a velocity of 36 kmh^-1. The centripetal force is

An imaginary co-ordinate system which is either at rest or in uniform motion and where Newton’s laws are valid is called an

A coin placed on a rotating  turntable  just slips, if it is placed at a distance of 8cm from the centre. If angular speed of the turntable is doubled, it will just slip at a distance of