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प्रश्न
The free fall of an object is possible only in _______.
विकल्प
air
vacuum
on the surface of earth
None of these
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उत्तर
The free fall of an object is possible only in vacuum.
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संबंधित प्रश्न
What do you mean by free fall?
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.
A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
Which force is responsible for the moon revolving round the earth ?
When an object is dropped from a height, it accelerates and falls down. Name the force which accelerates the object.
Give reason for the following :
The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.
Explain why, if a stone held in our hand is released, it falls towards the earth.
A ball falls off a table and reaches the ground in 1 s. Assuming g=10 m/s2, calculate its speed on reaching the ground and the height of the table.
i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest?
A metal ball of mass 5 kg falls from a height of 490 m. How much time it will take to reach the ground? (g = 9.8 m/s2)
A force of 15 N acts on a body of mass 2 kg. Calculate the acceleration produced.
A force of 10 N acts on a body of mass 5 kg. Find the acceleration produced.
What is escape velocity?
In vacuum, all freely falling objects have the same force. Is it true?
The value of gravitational acceleration at the centre of earth is zero.
Free fall of an object does not depend on the mass of the object.
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.
Write a short note.
Escape Velocity
