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A sphere of radius 25 cm and mass 1 kg is hung by a string of negligible mass and length 40 cm, then tension in string is ????
See below for the answer. First calculate the angle made by the string with horizontal and the resolve tension force to calculate the tension in string. The correct option is (A).
Answer is 8 as the angle theta will sbtended on wall not on centre of circleSo costhetha=✓l^2-r^2/rThat means Tcostheta=mgOr T=mg*r/✓l^2-r^2That will giveT= 10*0.25/0.3122T=8.0076N
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