14. Torque & Rotational Dynamics

A 2-m long bar is free to rotate about an axis located 0.7 m from one of its ends. Two forces act on the bar, F₁ = 100 N and F₂ = 200 N, and both make 30° with the bar. Find the Net Torque on the bar. Use +/− to indicate direction.

(II) Determine the net torque on the 2.0-m-long uniform beam shown in Fig. 10–56. All forces are shown. Calculate about

(b) point P at one end.

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If the coefficient of static friction between a car’s tires and the pavement is 0.65, calculate the minimum torque that must be applied to the 66-cm-diameter tire of a 1250-kg automobile in order to “lay rubber” (make the wheels spin, slipping as the car accelerates). Assume each wheel supports an equal share of the weight.