Determine the spring force, Mechanical Engineering

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A double shoe brake as shown in the figure is capable of absorbing a torque of 1400 N-m. The diameter of the brake drum is 350mm and the angle of contact of each shoe is 100°. If the coefficient of friction between the brake drum & lining is 0.4; determine:

i. the spring force necessary to set the brake

ii. the width of brake shoes, if the bearing pressure on the lining material is not to exceed 0.3 N/mm²

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