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ICSE Class 10 Answered

Block and tackle has four pulleys draw diagram of pulley system a man exerts a pull  of 240 Newton to lift a load of 720 N calculate mechanical advantage velocity ratio and efficiency
Asked by Samrat | 30 Jun, 2018, 11:15: PM
answered-by-expert Expert Answer
For diagram refer your physics Text book.
 
for a four pulley system, velocity ratio = 4;
 
Mechanical advantage = load/effort = 720/240 = 3
 
mechanical advantage = efficiency×velocity-ratio ; hence efficiency = 3/4 = 75%
Answered by Thiyagarajan K | 06 Jul, 2018, 02:40: PM

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