Explain why : heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water.

Because in the same amount of steam, compared to water at 100°C there is extra heat in the form of latent heat of vaporisation.

Explain why : heating systems based on circulation of steam are m…

It is possible to have a situation when E - U < 0?

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The energy required by a satellite to leave its orbit around the earth and escape to infinity is called its _________.

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Two clocks, one working with oscillating pendulum and the other with spring are given. Which one will you use in satellite?

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What is the weight of a body in a geostationary satellite?

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Are the Kepler's laws applicable only to the solar system?

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of the three Young's modulus of elasticity, Bulk modulus and shear modulus is possible in all the three states of matter (solid, liquid and gas)?

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What is a variable force?

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What is the frequency of oscillation of a simple pendulum mounted in a cabin that is freely falling under gravity?

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How do trees draw water from the ground?
The radius of a capillary tube is doubled. What change will take place in the height of the capillary rise?
In a capillary tube water descends and not rises. Guess the material of the capillary tube.

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What is the apparent weight of a man of mass 60kg who is standing on a lift which is moving up with a uniform speed? (g = 10ms^-2)

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