Chapter 10 – Gravitation
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
18
Sep
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
18
Sep
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 mass m is
18
Sep
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
18
Sep
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
18
Sep
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 radius is same as that of Earth. (C) Both the mass and radius of the planet are half as that of Earth. (D) Radius of the planet is half as that of Earth, but the mass is the same as that of Earth.
18
Sep
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.
18
Sep
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 [...]
The change in the gravitational potential energy when a body of a mass m is raised to a height nR above the surface of the earth is (here R is the radius of the earth)
18
Sep
The change in the gravitational potential energy when a body of a mass m is raised to a height nR above the surface of the earth is (here R is the radius of the earth) The change in the gravitational potential energy when a body of a mass m is raised to a height nR [...]
The escape velocity for the earth is ve. The escape velocity for a planet whose radius is 1/4th the radius of the earth and mass half that of the earth is :
18
Sep
The escape velocity for the earth is ve. The escape velocity for a planet whose radius is 1/4th the radius of the earth and mass half that of the earth is : The escape velocity for the earth is ve. The escape velocity for a planet whose radius is 1/4th the radius of the earth [...]
A particle is fired with a speed of 20 km/h. €The speed with which it will move in interstellar space is (ve = 8 root 2 km/h)
18
Sep
A particle is fired with a speed of 20 km/h. €The speed with which it will move in interstellar space is (ve = 8 root 2 km/h) A particle is fired with a speed of 20 km/h. €The speed with which it will move in interstellar space is (ve = 8 root 2 km/h) September [...]