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9.
10.
11. A body weighs 36 kg on the surface of earth. Its weight on the surface of a planet, whose mass is 1/9
and radius 1/3 of that of earth will be ______________________.
12.
If earth be at one half its present distance from the sun, then the days in a year will
be_________________.
13.
The escape speed from the earth for a piece of 10 gram is 11.2 km/s. For a piece of 100
gram the speed will be ___________________________.
14.
A man falls 50 m distance in 1 minute near the surface of earth. The distance covered by
him near the moon’s surface in same time will be ____________________.
15. If the mass of the planet is doubled and radius is halved, the acceleration due to gravity
becomes ______________________.
16.
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18.
