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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 ????

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 ????
 
 

Grade:11

2 Answers

Venkat
273 Points
5 years ago
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).
 
Aaryan Shivhare
15 Points
5 years ago
Answer is 8 as the angle theta will sbtended on wall not on centre of circle
So costhetha=✓l^2-r^2/r
That means Tcostheta=mg
Or T=mg*r/✓l^2-r^2
That will give
T= 10*0.25/0.3122
T=8.0076N

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