A rocket is fired with a speed of `2sqrt(gR)` near the surface of earth and is direceted upwards .What is the speed of the rocket in the interstellar space?

What is the value of 'g' at a height near the surface of earth?

A cathode ray tube is operated at 2,500 V. What is the speed of electrons emitted?

A rocket is fired vertically with a speed of 5 km s^-1 from the earth’s surface. How far from the earth does the rocket go before returning to the earth ? Mass of the earth = 6.0 xx 10^24 kg , mean radius of the earth = 6.4 xx 10^6 m , G = 6.67 xx 10^-11 N m^2kg^-2 .

The escape speed of a projectile on the earth’s surface is 11.2 km s^-1 . A body is projected out with thrice this speed. What is the speed of the body far away from the earth? Ignore the presence of the sun and other planets.

The equations of motion of a rocket are x=2t, y=-4t and z=4t , where time t is given in seconds, and the coordinates of a moving point in kilometres. What is the path of the rocket ? At what distance will be the rocket from the starting point O(0, 0, 0) in 10 s ?

A ball is thrown up with a speed of 9.8 ms^-1 What The acceleration while the ball is moving upwards.

The value of 'G' on the surface of earth is 6.67xx 10^- 11 Nm^2//kg^2 . What is its value on the surface of moon ?

A rocket of initial mass 6000 kg ejects mass at a constant rate of 16 kgs^-1 with constant relative speed of 11 kms^-1 . What is the acceleration of the rocket a minute after the blast? (Neglect gravity).

A rocket is fired from the earth towards the sun. At what distance from the earth’s centre is the gravitational force on the rocket zero ? Mass of the sun = 2xxl0^30 kg , mass of the earth = 6xxl0^24 kg . Neglect the effect of other planets etc. (orbital radius = 1.5 xx 10^11 m ).