Arihant Physics by D.C Pandey

Energy of a satellite in circular orbit is E0. The energy required to move the satellite to a circular orbit of 3 times the radius of the initial orbit is Energy of a satellite in circular orbit is E0. The energy required to move the satellite to a circular orbit of 3 times the radius [...]

A point P (R root3, 0, 0) lies on the axis of a fixed ring of mass M and radius R. The rings is located in the YZ plane with its centre at origin O. A small particle of mass m starts from P and reaches O under gravitational attraction only. Its speed at O [...]

Four equal masses (each of mass M) are placed at the corners of a square of side a. The escape velocity of a body from the centre O of the square is Four equal masses (each of mass M) are placed at the corners of a square of side a. The escape velocity of a [...]

Pertaining to two planets, the ratio of escape velocities from respective surfaces is 1:2 , the ratio of the time period of the same simple pendulum at their respective surfaces is 2:1 (in same order). Then the ratio of their average densities is Pertaining to two planets the ratio of escape velocities from respective surfaces [...]

A body is projected vertically upwards from the surface of the earth with a velocity equal to half of escape velocity of the earth. If R is radius of the earth, maximum height attained by the body from the surface of the earth is A body is projected vertically upwards from the surface of the [...]

A solid sphere of mass M and radius R has a spherical cavity of radius R/2 such that the centre of cavity is at a distance R/2 from the centre of the sphere. A point mass m is placed inside the cavity at a distance R/4 from the centre of sphere. The gravitational force on [...]

Given mass of the moon is 1/81 of the mass of the earth and corresponding radius is 1/4 of the earth. If escape velocity on the earth surface is 11.2 km / s , the value of same on the surface of the moon is Given mass of the moon is 1/81 of the mass [...]

A research satellite of mass 200 kg circles the earth in an orbit of average radius 3R/2, where R is the radius of the earth. Assuming the gravitational pull on the mass of 1kg on the earth’s surface to be 10N, the pull on the satellite will be A research satellite of mass 200 kg [...]

An astronaut on a strange planet finds that acceleration due to gravity is twice as that on the surface of Earth. Which of the following could explain this? (A) Both the mass and radius of the planet are twice as that of Earth. (B) Mass of the planet is half as that of Earth, but [...]

By what percent the energy of the satellite has to be increased to shift it from an orbit of radius r to 3r/2. By what percent the energy of the satellite has to be increased to shift it from an orbit of radius r to 3r/2. September 18, 2020 Category: Arihant Physics by D.C Pandey [...]