Fig. 105 shows a quick return mechanism. The crank (O A) rotates clockwise uniformly. (O A=2 mathrm{~cm},
Question:
Fig. 105 shows a quick return mechanism. The crank \(O A\) rotates clockwise uniformly. \(O A=2 \mathrm{~cm}, O O^{\prime}=4 \mathrm{~cm}\). The ratio of time for forward motion to that for return motion is
(a) 0.5
(b) 2.0
(c) \(\sqrt{12}\)
(d) 1 .
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