Question

Solution

Correct option is The velocity of space-craft in a circular orbit close to the earth’s surface is given by and the escape velocity is given by The additional velocity required by the space-craft to go beyond earth’s gravitational attraction, that is, to escape is    SIMILAR QUESTIONS

Q1

The radius of earth is 6400 km and mass is kg. What will be the gravitational potential energy of a body of 200 kg placed at a height of 600 km from the surface of the earth? Q2

A body of mass m is moved from the surface of the earth to a height (his not negligible in comparison to radius of earth Re). Prove that the increase in potential energy is Q3

Calculate the velocity of projection of a particle so that the maximum height attained by the particle is 0.5 Re, where Re is radius of earth. The mass of earth is Me.

Q4

A satellite is revolving in a circular orbit at a distance of 2620 km from the surface of the earth. Calculate the orbital velocity and the period of revolution of the satellite. Radius of the earth = 6380 km, mass of the earth = Nmkg–2

Q5

A satellite is revolving in a circular orbit at a distance of 3400 km. calculate the orbital velocity and the period of revolution of the satellite. Radius of the earth = 6400 km and g = 9.8 ms –2.

Q6

(i) A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as find the value of the orbital speed and the period of revolution of the satellite. (ii) What is the relationship of this orbital speed to the velocity required to send a body from the earth’s surface into space, never to return?

Q7

An artificial satellite revolving coplanar with the equator around the earth, appears stationary to an observer on the earth. Calculate the height of the satellite above the earth. Q8

An artificial satellite is revolving at a height of 500 km above the earth’s surface in a circular orbit, completing one revolution in 98 minutes. Calculate the mass of the earth. Given: Q9

If the period of revolution of an artificial satellite just above the earth be Tand the density of earth be then prove that ρT2 is a universal constant. Also calculate the value of this constant. Q10

An artificial satellite of mass 200 kg revolves around the earth in an orbit of average radius 6670 km. Calculate its orbital kinetic energy, the gravitational potential energy and the total energy in the orbital.

(Mass of earth = 6.0 × 1024 kg, G = 6.67 × 10–11 Nm2 kg –2).