HARD
11th West Bengal Board
IMPORTANT
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If the distance between the earth and the sun were half of its present value, the number of days in a year would have been

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Important Questions on Gravitation

HARD
11th West Bengal Board
IMPORTANT
An earth satellite S has an orbit radius which is 4 times that of a communication satellite C. The period of revolution of S is
HARD
11th West Bengal Board
IMPORTANT
The period of revolution of a planet A around the sun is 8 times that of planet B. The distance of A is how many times greater than that of B from the sun?
MEDIUM
11th West Bengal Board
IMPORTANT

The earth rotates about the sun (see Fig. 12.54) in an elliptical orbit. At which point is velocity maximum?

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HARD
11th West Bengal Board
IMPORTANT
A geostationary satellite orbits around the earth in a circular orbit of radius 36000 km. Then, the time period of a spy satellite orbiting a few hundred kilometre's above the earth's surface Rearth=6400 km will approximately be
MEDIUM
11th West Bengal Board
IMPORTANT
A body of mass m is taken from the earth's surface to a height equal to the radius of the earth. The change (increase) in potential energy will be 
HARD
11th West Bengal Board
IMPORTANT

In a satellite if the time period is T, then K, E, is proportional to

HARD
11th West Bengal Board
IMPORTANT

An artificial satellite revolves around the earth in circular orbit with a speed v. If m is the mass of the satellite, its total energy is

MEDIUM
11th West Bengal Board
IMPORTANT
A satellite is in orbit around the earth, if its kinetic energy is doubled, then