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Find the work done in bringing three particles, each having a mass of 0.1 kg from large distance to the vertices of an equilateral triangle of 10 cm in a gravity free region. Assume that no change of kinetic energy is involved in the bringing particles.
An apple of mass 0.25 kg falls from a tree. What is the acceleration of the apple towards the Earth? Also calculate the acceleration of the Earth towards the apple. Given: Mass of Earth = 5.983 × 1024 kg, Radius of Earth = R = 6.378 × 106 metre, G = 6.67 × 10-11 N m2 kg-2.
A sphere of mass 40 kg is attracted by another sphere of mass 15 kg with a force of 1 / 10 mg wt. Find the value of constant of gravitation if centres of spheres are 0.2 m apart.
Calculate the force of attraction between two bodies, each of mass 100 kg and 1 m apart on the surface of the Earth. Will the force of attraction be different if the same bodies are taken on the Moon, their separation remaining constant.
Mass of a body is m on the surface of earth. What will be its weight on surface of earth and at height h = R/100 above the surface of earth.
The work done in lifting a body of mass ‘m’ from the earth’s surface, through a height ‘h’ is mg R/3 where ‘g’ is the acceleration due to gravity on the earth’s surface and ‘R’ is the radius of the earth. Calculate the value of h.
Find the % decrease in weight of a body, when taken 16 km below the surface of earth. Take radius of earth = 6400 km.