the gravitational force between sun and jupiter is approximately `4xx10^23`N. If mass of sum `=1.99 xx 10^30` kg, the mean distance of the jupiter from the sun is `7.8 xx 10^11`m, find the mass of jupiter.

Calculate the force of gravitation between the earth and the sun, given the mass of earth = 6xx 10^24 kg and of the sun = 2 xx10^30 kg . Average distance between the two is 1.5xx 10^10m .

Find the mass of earth (Given the radius of earth R= 6.4 xx 10^6 m) .

What is magnitude of gravitational force between the earth and a 1 kg object on its surface ? Take mass of earth to be 6 xx 10^24 kg and radius of the earth is 6.4 xx 10^6 m.G =6.67 xx10^-11nm^2kg^-2 .

A boy is trying to start a fire by focussing sunlight on a piece of paper using an equiconvex lens of focal length 10 cm.The diamerter of the sun is 1.39 xx 10^9 m and its mean distance form the earth is 1.5 xx 10^(11) .What is the diameter of the sun's image on the paper?

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 ).