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A rigid ball of weight 100 N is suspended with the help of a string. The ball is pulled by a horizontal force F such that the string makes an angle of 30° with the vertical. The magnitude of force F(in N) is ______.
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- 75.47 N
- 157.47 N
- 57.74 N
- 7.74 N
Correct Option: C
Applying Lami’s theorem
| = | = | ||||
| sin 120° | sin(60° + 90°) | sin 90° |
F = 57.74 N
