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(ii) at an angle of 60° to the force(d) In block and tackle system, a load of 7.5 kgf is raised with an effort of 2.5 kgf. Ifthere are 4 pulleys in the system. Find mechanical advantage, velocity ratio andefficiency[2](e) Name a machine which is used to(1) Multiply force(ii) Change the direction of force applied[2]QUESTION 2(a) 20 g of ice is mixed with 80 g of water at 0°С. Find the final temperature of themixture. (Take specific latent heat of ice as 336 Jg-1)12fb) Give one example each of natural vibration, forced vibration and resonance.[12(c) Name the physical quantity that is measured in: |
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Answer» Answer: Given that, LOAD =75kgf Effort =25kgf Number of pulleys n=3 We know that, The mechanical ADVANTAGE is M.A= E L
M.A= 25 75
M.A=3 Now, the velocity RATIO is Velocity ratio = numbers of pulleys V.R=3 Now, the efficiency is η= V.R M.A
η= 3 3
η=1×100 η=100% |
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