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    				| 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° | |