Assignment - 5 (Based on Work and Energy)
1. A object of mass 50 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 60 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 35 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 90 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 108 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 )
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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 9 hours per day. Find units
consumed in a day ?
8. A fan of 100 w is used for 9 hours per day. Find units
consumed in a week ?
9. A television of 200 w is used for 9 hours per day.
Find units consumed in a
month ?
10. A fan of 100 W and a bulb of 7 W is used for 9 hours
per day. Find units consumed in a month ?
11. A object of mass 25 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 15 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 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 ?
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 11 hours per day. Find units consumed in a
day ?
18. A fan of 100 w is used for 11 hours per day. Find units consumed in a
week ?
19. A television of 200 w is used for 11 hours per day. Find units consumed
in a month ?
20. A fan of 100 W and a bulb of 7 W is used for 11 hours per day. Find
units consumed in a month ?
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