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:
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Every liquid exerts an upward force on the objects immersed in it. The upward force is called ________.
How will you 'weigh the sun', that is estimate its mass? The mean orbital radius of the earth around the sun is 1.5× 108 km.
The escape velocity of a sphere of mass m is given by (G= univesal gravitational constant, Me= mass of the earth and Re= radius of the earth)
When a hollow steel ball and a solid steel ball of the same size are submerged in water, do the two experience the same upthrust?
The volume of a 500 g sealed packet is 350 cm3. Will the packet float or sink in water if the density of water is 1 g cm−3? What will be the mass of the water displaced by this packet?
As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly 36,000 km from the surface of the earth. What is the potential due to earth's gravity at the site of this satellite ? (Take the potential energy at infinity to be zero). Mass of the earth = 6.0×1024 kg, radius = 6400 km.
From a solid sphere of mass M and radius R, a spherical portion of radius R/2 is removed, as shown in the figure Taking gravitational potential V=0atr=∞, the potential at (G = gravitational constatn)