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hiiii,could someone help me with these qns??
1)in selina pg 46,qn 6
The bob of a simple pendulum is imparted a velocity of 5m/s when it is at its mean position.To what max vertical ht will it rise on reaching at its extreme position if 60% of its energy is lost in overcoming the friction of air??(Answer 0.75m)
plzz explain how to solve it.
2)pg;67 qn 2:
A fixed pulley is driven by a 100kg mass falling at a rate of 8.0m in 4s.It lifts a load of 75kgf.calc:
(a)the power input
(b)efficiency
(c)ht to which the load is raised in 4s.
I did the first part but dont know how to do the rest.Plzz help....
3)in selina,there are no experiments given for calorimetry.Then should I learn that???
plzz answer asap............ |
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