Q14.(i)Calculate the effort applied by the crowbar if it can lift a load of 50N and having mechanical advantage of 5.
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Answer:
Given: L = 5 kgf, Load arm = 20 cm, Effort arm = 100 – 20 = 80 cm.
(Since the crow bar is the lever of first order with fulcrum in between the load and the effort).
(i) Mechanical advantage = Effort arm/Load arm = 80/20 = 4
(ii) M.A. = Load(L)/Effort(E)
∴ Effort = Load(L)/M.A. = 5/4
= 1.25 kgf.
Explanation:
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