\( \mathrm{A} \) bob of mass \( m \) is attached at one end of a st...
0\( \mathrm{A} \) bob of mass \( m \) is attached at one end of a string of length \( \ell \). Other end of the string is fixed at point O. Bob is rotating in a circular path of radius \( \ell \)
\( \mathrm{P} \) in horizontal plane about \( \mathrm{O} \) with constant speed
W \( v \), as shown in the figure. The average force exterted by string on the bob during its :-
(A) half revolution will be \( \frac{m v^{2}}{\pi \ell} \)
(B) half revolution will be \( \frac{2 \mathrm{mv}^{2}}{\pi \ell} \)
(C) one fourth revolution will be \( \frac{\sqrt{2} \mathrm{mv}^{2}}{\pi \ell} \)
(D) one revolution will be zero
Select correct alternative :-
(1) Only (A) and (D)
(2) Only (A), (C) and (D)
(3) Only (B) and (D)
(4) Only (B), (C) and (D)
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