4. A single string has 5 pulleys. If an effort of 50 kgf is required to raise a load of 150 kgf, then the efficiency of the system
60%
80%
100%
none of these
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Answer:
100%
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Given: A string has 5 pulleys. An effort of 50 kgf is required to raise a load of 150 kgf.
To find: Efficiency of the system
Explanation: A single string has 5 pulleys. Effort of 50 kgf is required.
Total Effort = 50*5 = 250 kgf
But, this force is not used completely in doing the work. It is not completely efficient. Some of it is wasted as heat.
Total force that was used= 150 kgf
Efficiency= (Force used * 100)/ Effort
= 150*100 / 250
= 60%
Therefore, the efficiency of the system is 60%.
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