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The properties of a surface are differen...

The properties of a surface are different from those of the bulk liquid because the surfce molecules are

A

are smaller than other molecules

B

acquire charge due to collision from air molecules

C

find different type of molecules in their range of influence.

D

feel a net force in different direction

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Verified by Experts

The correct Answer is:
C
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Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the space station the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their being in the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. If a traveller releases an object from her hand in the spacecraft, what will happen?

Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the space station the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their being in the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. Is the value of g zero in the space station?

Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the space station the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their being in the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. Why is weightlessness caused in a spacecraft?

Weightlessness in space: Space travellers as well as objects in the spacecraft appear to be floating. Why does this happen? Though the spacecradft is at a height from the surface of the earth the value of g there is not zero. In the space station the value of g is only 11% less than its value on the surface of the earth. Thus, the height of a spacecraft is not the reason for their weightlessness. Their weightlessness is caused by their being in the state of free fall. Though the spacecraft is not falling on the earth because of its velocity along the orbit, the only force acting on it is the gravitational force of the earth and therefore it is in a free fall state. As the velocity of free fall does not depend on the properties of an object, the velocity of free falls is the same for the spacecraft, the travellers and the objects in the craft. Thus, if a traveller releases an object from her hand, it will remain stationary with respect to her and will appear to be weightless. Why doesn't the spacecraft fall towards the Earth?

SURA PUBLICATION-PROPERTIES OF MATTER-Additional Questions (I. Multiple Choice Questions :)
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  7. If more air is pushed in a soap bubble, the pressure in it will

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  8. If two soap bubbles of different radii are connected by a tube, then

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  9. The excess pressure inside a soap bubble is twice the excess pressure ...

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  10. Water rises in a vertical capillary tube upto a length of 10 cm if the...

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  11. Viscosity is a property of

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  12. The force of viscosity is

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  13. The viscous force acting between 2 layers of a liquid is given by (F)/...

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  14. A raindrop falls near the surface of the earth with almost uniform vel...

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  15. A piece of wood is taken deep inside a long column of water & released...

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  16. The rise of a liquid in a capillary tube depends on

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  17. The contact angle between a solid & a liquid is a property of

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  18. The properties of a surface are different from those of the bulk liqui...

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  19. When a capillary tube is dipped into a liquid the liquid neither rises...

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  20. A liquid is contained in a vertical tube a semicircular cross section ...

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