MEDIUM
Earn 100

Explain why is it necessary to use a minimum two stage rocket to launch a satellite into a circular orbit around the earth.

Important Questions on Gravitation

EASY
Physics>Mechanics>Gravitation>Weightlessness
If the earth stops rotating in its orbit about the sun, there will be variation in the weight of our bodies at
EASY
Physics>Mechanics>Gravitation>Weightlessness
Weight of a body of mass m in its free fall above the surface of the earth is
EASY
Physics>Mechanics>Gravitation>Weightlessness
Persons sitting in an artificial satellite circling around the earth have
EASY
Physics>Mechanics>Gravitation>Weightlessness
A person jumps from the 5th  storey of a building with load on his head. The weight experienced by him before reaching the earth will be
EASY
Physics>Mechanics>Gravitation>Weightlessness
In an earth satellite moving in a circular orbit, a piece of metal (weighing 0.016 kg on the earth) is weighed by a spring balance while the metal is suspended in water. If the density of metal is 8 times of water density, then the recorded weight will be (g is acceleration due to gravity)
HARD
Physics>Mechanics>Gravitation>Weightlessness
A planet of radius R=110× (radius of Earth) has the same mass density as Earth. Scientists dig a well of depth R5 on it and lower a wire of the same length and of linear mass density 10-3 kg m-1 into it. If the wire is not touching anywhere, the force applied at the top of the wire by a person holding it in place is (take the radius of Earth =6×106 m and the acceleration due to gravity of Earth is 10 m s-2)
MEDIUM
Physics>Mechanics>Gravitation>Weightlessness
The ratio of the weights of a body on Earth’s surface to that on the surface of a planet is 9:4 The mass of the planet is 19th of that of the Earth. If R is the radius of the Earth, what is the radius of the planet? (Take the planets to have the same mass density)
EASY
Physics>Mechanics>Gravitation>Weightlessness
If radius of the Earth contracts by 2% and its mass remains the same, then the weight of a body at the Earth's surface
MEDIUM
Physics>Mechanics>Gravitation>Weightlessness
What is the value of escape velocity on the earth?
EASY
Physics>Mechanics>Gravitation>Weightlessness
What will be the path of the satellite if the horizontal speed of projection vh is greater than the critical velocity vc but less than the escape velocity ve
EASY
Physics>Mechanics>Gravitation>Weightlessness
Find the apparent weight of an object in a satellite revolving around the earth.
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Physics>Mechanics>Gravitation>Weightlessness

What is a satellite in physics?

EASY
Physics>Mechanics>Gravitation>Weightlessness
What will be the path of the satellite if the horizontal speed of projection vh is equal to the critical velocity vc?
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Physics>Mechanics>Gravitation>Weightlessness
An Astronaut is in a stable orbit around the earth when he weighs a body of mass 5 kg. What is the reading of spring balance?
EASY
Physics>Mechanics>Gravitation>Weightlessness
Draw a well labelled diagram to show different trajectories depending upon the tangential projection speed.
EASY
Physics>Mechanics>Gravitation>Weightlessness

A thief stole a box full of valuable articles of weight w and while carrying it on his head jumped down from a wall of height h from the ground. Before he reaches the ground, he experienced a load

MEDIUM
Physics>Mechanics>Gravitation>Weightlessness
Derive an expression for critical velocity of a satellite.
MEDIUM
Physics>Mechanics>Gravitation>Weightlessness
What is the function of first stage of the two stage rockect?
EASY
Physics>Mechanics>Gravitation>Weightlessness
What will be the path of the satellite if the horizontal speed of projection vh is equal to the escape velocity ve
EASY
Physics>Mechanics>Gravitation>Weightlessness
If the velocity of the projection is less than the critical velocity, then the satellites move in