A bob of mass `m` is attached at one end of a string of length `l` other end of the string is fixed at point `O`. Bob is rotating in a circular path of radius `l` in horizontal plane about `O` with constant speed `v`, as shown in the figure. The average force exterted by string on the bob during its `:-` `(A)` half revolution will be `(mv^(2))/(pil)` `(B)` half revolution will be `(2mv^(2))/(pil)` `(C)` one fourth revolution will be `(sqrt2mv^(2))/(pil)` `(D)` one revolution will be zero Select correct alternative `:-`A. Only (A) and (D)B. Only (A), (C) and (D)C. Only (B) and (D)D. Only (B), (C) and (D)

A bob of mass `m` is attached at one end of a string of length `l` oth

1.	A bob of mass `m` is attached at one end of a string of length `l` other end of the string is fixed at point `O`. Bob is rotating in a circular path of radius `l` in horizontal plane about `O` with constant speed `v`, as shown in the figure. The average force exterted by string on the bob during its `:-` `(A)` half revolution will be `(mv^(2))/(pil)` `(B)` half revolution will be `(2mv^(2))/(pil)` `(C)` one fourth revolution will be `(sqrt2mv^(2))/(pil)` `(D)` one revolution will be zero Select correct alternative `:-`A. Only (A) and (D)B. Only (A), (C) and (D)C. Only (B) and (D)D. Only (B), (C) and (D)
Answer» Correct Answer - A

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