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प्रश्न
What is escape velocity?
उत्तर
The minimum velocity required to project an object to escape from the Earth's gravitational pull is known as escape velocity. It is given as: vesc = `sqrt((2"GM")/"R")`
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संबंधित प्रश्न
What do you mean by free fall?
Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate
- the maximum height to which it rises.
- the total time it takes to return to the surface of the earth.
State whether the following statement is true or false :
A falling stone also attracts the earth.
State whether the following statement is true or false :
The acceleration due to gravity acting on a freely falling body is directly proportional to the mass of the body.
Fill in the following blank with suitable word :
The acceleration due to gravity on the moon is about ………………of that on the earth.
What is the force of gravity on a body of mass 150 kg lying on the surface of the earth? (Mass of earth = 6 x 1024 kg; Radius of earth = 6.4 x 106 m; G = 6.7 x 10-11 Nm2/kg2)
Explain why, a wide steel belt is provided over the wheels of an army tank.
What will be the weight of a person on earth, who weighs 9N on the moon?
The total energy of an object falling freely towards the ground ______.
The acceleration produced in a body by a force of given magnitude depends on
A force acts for 0.1 s on a body of mass 2.0 kg initially at rest. The force is then withdrawn and the body moves with a velocity of 2 m s-1. Find the magnitude of the force.
How are g and G realated ?
In vacuum, all freely falling objects have the same force. Is it true?
Write scientific reason.
The value of gravitational acceleration (g) decreases as we go deep inside the earth.
Write scientific reason.
When we drop a feather and a stone at the same time from a height the stone reach the earth faster than a feather.
Write scientific reason.
The value of gravitational acceleration (g) is taken to be -g when studying the motion of an object thrown upwards in a straight line.
Distinguish between:
Universal gravitational constant - Gravitational acceleration of earth.
Write a short note.
Free Fall
The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth.
