Assignment – 2 (Gravitation and Work and Energy)
1. A stone is thrown from the roof of building in upward
direction with velocity 19.6 m/sec.
a). Find maximum height.
b). Calculate total time taken to reach the earth.
2. A stone is thrown from the roof of building of height
19.6 m in downward direction.
a). Find final velocity.
b). Calculate total time taken to reach the earth.
3. A stone is thrown from the roof of building in upward
direction with velocity 9.8 m/sec.
a). Find maximum height.
b). Calculate total time taken to reach the earth.
4. A stone is thrown from the roof of building of height 9.8
m in downward direction.
a). Find final velocity.
b). Calculate total time taken to reach the earth.
5. Find the gravitational force between earth and moon?
Mass of earth = 6 * 10^27 g
Mass of moon = 7.35 * 10^25 g
Distance between moon and earth = 3.84 * 10^8 m
6. A ball is thrown from a height of 196 m downward and
another ball is thrown upward at same time with velocity 39.2 /sec. Find the
meeting point of both the balls.
7. A force of 15 N is acting on object by which object moves 5
meter. Find the work done by object ?
8. A force of 40 N is acting on object by which object moves 50
meter. Find the work done by object ?
9. A man lifts a mass of 40 Kg for a height of 3 m from the floor.
Calculate the work done by man
? ( Take
g = 10 m / sec^2 )
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10. A man lifts a mass of 90 Kg for a height of 5 m from the
floor. Calculate the work done by man
? ( Take
g = 10 m / sec^2 )
11. A car of mass 1500 kg is moving with uniform velocity 10
m/sec. Find the Kinetic energy of car ?
12. A car of mass 1600 kg is moving with uniform velocity 5 m/sec.
Find the Kinetic energy of car ?
13. What work to be done to increase the velocity from 36 km/h to
72 km/h if the mass of bicycle is 50 Kg ?
14. What work to be done to increase the velocity from 72 km/h to
144 km/h if the mass of bicycle is 100 Kg ?
15. Find the energy by an object of mass 45 Kg when it at a height
of 10 m. (Take g = 10 m/sec^2)
16. Find the energy by an object of mass 35 Kg when it at a height
of 5 m. (Take g = 10 m/sec^2)
17. Find the energy by an object of mass 40 Kg when it at a height
of 5 m. (Take g = 10 m/sec^2)
18. A man lifts a mass of 80 Kg for a height of 5 m from the
floor. Calculate the work done by man
? ( Take
g = 10 m / sec^2 )
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