Assignment
- 4 (Work and Energy)
1.
A object of mass 40 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 40 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 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 ?
4.
Two army men, each weight have 100 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 72 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 50 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 10 hours per day. Find units consumed in a day ?
8.
A fan of 100 w is used for 10 hours per day. Find units consumed in a week ?
9.
A television of 200 w is used for 10 hours per day. Find units consumed in a
month
?
10.
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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11. 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 )
12. A object of
mass 20 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 50 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 140 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 90 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 81 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 12 hours per day. Find units consumed in a day ?
18. A fan of
100 w is used for 12 hours per day. Find units consumed in a week ?
19. A television
of 200 w is used for 12 hours per day. Find units consumed in a month ?
20. A fan of
100 W and a bulb of 7 W is used for 12 hours per day. Find units consumed in a
month ?
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