A body attains a height equal to the radius of the earth when projected from earth's surface the velocity of body with which it was projected is
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State whether the following statements are true or false:(a) The buoyant force depends on the nature of object immersed in the liquid(b) 'Archimedes' principle can also be applied to gases.
The figure shows elliptical orbit of a planet m about the sun S. the shaded area SCD is twice the shaded area SAB. If t1 be the time for the planet to move from C to D and t2 is the time to move from A to B, then:
What is the acceleration of free fall?
Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0 m apart on a horizontal table. What is the gravitational force and potential at the mid point of the line joining the centres of the spheres ? Is an object placed at that point in equilibrium? If so, is the equilibrium stable or unstable ?
An object can be completely immersed in a liquid when:
Why will a sheet of paper fall slower than one that is crumpled into a ball?
Two stars each of one solar mass (=2×1030 kg) are approaching each other for a head on collision. When they are a distance 109 km, their speeds are negligible. What is the speed with which they collide ? The radius of each star is 104 km. Assume the stars to remain undistorted until they collide. (Use the known value of G).
A saturn year is 29.5 times the earth year. How far is the saturn from the sun if the earth is 1.50×108km away from the sun ?