1.

(i) Derive a relationship between S.I. and C.G.S. unit of work.(ii) A force acts on a bod y and displaces it by a distance S in a direction at an angle θ with the direction of force. What should be the value of θ to get the maximum positive work?

Answer»

(i) SI unit of work = Nm (Joule) 

CGS unit of work = dyne cm (erg) 

1 N = 105 dyne

1 m = 102 cm

1 Joule = 105 x 102 dyne cm = 107 erg

(ii) W = F ·S = FS cos  θ

cos  θ maximum value 1 = FS

 θ =  0°



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