Q56 of 176 Page 102

An object is thrown vertically upwards with a velocity u, the greatest height h to which it will rise before falling back is given by:

A. u/g B. u2/2g


C. u2/g D. u/2g

Since, The maximum height will be reached by the object when its v will be equal to zero.

We know:


v2 = u2 - 2gh


(0)2 = u2 - 2gh


u2 = 2gh


h = u2/ 2g

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54

State and explain Kepler’s laws of planetary notion. Draw diagrams to illustrate these laws.

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The mass of a planet is 6 × 1024 kg and its diameter is 12.8 ×103 km. If the value of gravitational constant be 6.7×10-11 Nm2/kg2, calculate the value of acceleration due to gravity on the surface of the planet. What planet could this be?

 57

The mass of moon is about 0.012 times that of earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be:

A. Less than that on the earth


B. More than that on the earth


C. Same as that on the earth


D. About one-sixth of that on the earth

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The value of g on the surface of the moon:

A. Is the same as on the Earth


B. Is less than that on the Earth


C. Is more than that on the Earth


D. Keeps changing day by day