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    				| 1. | Two blocks of masses 10 kg and 30 kg are placed along a vertical line. The first block is raised througha height of 7 cm. By what distance should the second mass be moved to raise the centre of mass1 cm? | 
| Answer» let initially the COM is at x= 0 so, when COM is at x = 1cm and 10kg is at 7cm the the expression becomes Xcm = (m1x1 +m2x2)/(m1+m2) => 1= 10*7+30*(x2)/(10+30)=> 40 = 70 +30(x2)=> x2 = (40-70)/30 = -1cm... 30 kg mass should be moved 1cm away. | |