Assignment - 3 (Work and Energy)
1. A object of mass 20 kg at a
height. If the potential energy of object is 800 J. Find the height of object?
(Take g = 10 m/sec^2 )
2. A object of mass 30 kg at a height. If the potential energy of
object is 600 J. Find the height of object? (Take g = 10 m/sec^2 )
3. Two army men, each weight have 80 Kg, climbs on a rope for
height 5 m. First army man takes 5 sec and second army man takes 10 sec. Find
the power expended by army man ?
4. Two army men, each weight have 120 Kg, climbs on a rope for
height 6 m. First army man takes 7 sec and second army man takes 14 sec. Find
the power expended by army man ?
5. A army woman of mass 54 kg runs on staircase 36 steps in 10
sec. If the height of each staircase is 12 cm. Find her power? (Take g = 10
m/sec^2 )
6. A army woman of mass 60 kg runs on staircase 30 steps in 10
sec. If the height of each staircase is 10 cm. Find her power? (Take g = 10 m/sec^2
)
7. A bulb of 7 w is used for 8 hours per day. Find units consumed
in a day ?
8. A fan of 100 w is used for 8 hours per day. Find units consumed
in a week ?
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9. A television of 200 w is used for 7 hours per day. Find units
consumed in a
month ?
10. A fan of 100 W and a bulb of 7 W is used for 7 hours per day.
Find units consumed in a month ?
11.
A object of mass 10 kg at a height. If the potential energy of object is 800 J.
Find the height of object? (Take g = 10 m/sec^2 )
12. A object of mass 10 kg at a
height. If the potential energy of object is 600 J. Find the height of object?
(Take g = 10 m/sec^2 )
13. Two army men, each weight
have 60 Kg, climbs on a rope for height 5 m. First army man takes 5 sec and
second army man takes 10 sec. Find the power expended by army man ?
14. Two army men, each weight
have 150 Kg, climbs on a rope for height 6 m. First army man takes 7 sec and
second army man takes 14 sec. Find the power expended by army man ?
15. A army woman of mass 81 kg
runs on staircase 36 steps in 10 sec. If the height of each staircase is 12 cm.
Find her power? (Take g = 10 m/sec^2 )
16. A army woman of mass 90 kg
runs on staircase 30 steps in 10 sec. If the height of each staircase is 10 cm.
Find her power? (Take g = 10 m/sec^2 )
17. A bulb of 7 w is used for 10
hours per day. Find units consumed in a day ?
18. A fan of 100 w is used for
10 hours per day. Find units consumed in a week ?
19. A television of 200 w is
used for 10 hours per day. Find units consumed in a month ?
20. A fan of 100 W and a bulb of
7 W is used for 10 hours per day. Find units consumed in a month ?
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