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15. Laws of Motion and Gravitation
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Q15 of 46 Page 247

If an angel visits an asteroid called B 612 which has a radius of 20 m and mass of 104 kg, what will be the acceleration due to gravity in B 612?


Where G is the universal gravitational constant (= 6.67 × 10-11 Nm2kg-2),


M is the mass of the earth,


R is the radius of the earth.


Masteroid = 104 kg


Rasteroid = 20 m



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Renu is standing in a dining line 6.38 x 103 km from the centre of the earth. The mass of the earth is 6 x 1024 kg.

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16

A man of mass ‘m’ standing on a plank of mass ‘M’ which is placed on a smooth horizontal surface, is initially at rest. The man suddenly starts running on the plank with a speed of ‘v’ m/s with respect to the ground. Find the speed of the plank with respect to the ground.

17

Two balls of masses in ratio 2:1 are dropped from the same height. Neglecting air resistance, find the ratio of

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Questions · 46
15. Laws of Motion and Gravitation
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