What is the magnitude of the torque developed by the brake

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Reference no: EM131378702

Figure P18.22 shows a brake with only one shoe, being applied by a 1.5-kN force. (The complete brake would normally have a second shoe in order to balance the forces, but only one shoe is considered here to keep the problem short.) Four seconds after force F is applied, the drum comes to a stop. During this time the drum makes 110 revolutions. Use the short-shoe approximation and an estimated coefficient of friction of 0.35.

(a) Draw the brake shoe and arm assembly as a free body in equilibrium.

(b) Is the brake self-energizing or deenergizing for the direction of drum rotation involved?

(d) How much work does the brake do in bringing the drum to a stop?

(e) What is the average braking power during the 4-second interval?

(f) How far below the drum center would the arm pivot need to be to make the brake self-locking for f = 0.35?

Reference no: EM131378702

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