Question 8.6: A pipeline valve handle consists of three equally spaced han...
A pipeline valve handle consists of three equally spaced handle grips of equal mass m attached to the valve body of mass M by thin rigid torque bars of equal length ℓ and negligible mass. The handle, initially at rest, is turned by forces f_1 and f_2 of equal constant magnitude F applied at two grips in the plane of, and perpendicular to the torque bars, as shown in Fig. 8.7. The handle turns freely without friction. (a) Apply the work–energy principle to find as a function of time the angular speed ω(t) of the handle. (b) Derive the same result by use of the moment of momentum principle.
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