q1. a crowbar is used to overcome a load of hundred kilogram the length of the Cowboy is one and the fulgrim is 25 CM away from the load what class of lever is cover what is it mechanical advantage what minimum effort is needed to overcome the load
q2.an incline plane makes an angle of 20 degree with horizontal what is its mechanical advantage if a man can put maximum effort of 40 KGF what minimum load he can push on this plane when sin 20 is equals to 0.34
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q1. L/E = EA/LA
100kgf/E = 100cm/25cm
E= 100÷4
E= 25 kgf
And MA = L/E
=100kgf/25kgf
=4
q2. MA = 1/sin 20°
=1/0.34
=2.9
MA = 3 ( aprox.)
Mini. Load = MA × E
= 3× 40 kgf
=120 kgf
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