Class 12

Physics

Mechanics

Gravitation

What will be the formula of the mass in terms of g,R and G ? (R = radius of the earth)

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A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth's gravitational influence? Mass of the satellite $=200kg$; mass of the earth $=6.0×10_{24}kg$; radius of the earth $=6.4×10_{6}m$; G = $6.67×10_{−11}Nm_{2}kg_{−2}$.

State the Archimedes principle.

If the distance between the earth and the sun were half its present value, the number of days in a year would have been

Does a sunk body at the bottom of a vessel experience an upthrust?

Which of the following is an application of Archimedes' principle?

Calculate the value of acceleration due to gravity at a point a. 5.0 km above the earth's surface and b. 5.0 km below the earth's surface. Radius of earth =6400 km and the value of g at the surface of the earth is 9.80$ms_{2}$

The upward force exerted by a liquid on an object is called _______.

Imagine a new planet having the same density as that of earth but $3$ times bigger than the earth in size. If the acceleration due to gravity on the surface of earth is $g$ and that on the new plane is $g$ , then :