Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb • in., assuming that the drum is rotating counterclockwise. Neglect the weight of the brake arm. 60° A -2 in.- 4 in. B 4 in. 2 in.-

Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb • in., assuming that the drum is rotating counterclockwise. Neglect the weight of the brake arm. 60° A -2 in.- 4 in. B 4 in. 2 in.-

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.60P: The force P applied to the brake handle enables the band brake to reduce the angular speed of a...

See similar textbooks

Similar questions

The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
A uniform plank is supported by a fixed support at A and a drum at B that rotates clockwise. The coefficients of static and kinetic friction for the two points of contact are as shown. Determine whether the plank moves from the position shown if (a) the plank is placed in position before the drum is set in motion; and (b) the plank is first placed on the support at A and then lowered onto the drum, which is already rotating.
The block of weight W is pulled by the force P inclined at the angle to the horizontal. Find the smallest force P and the corresponding angle that would cause impending sliding of the block. The angle of static friction between the block and the ground is s.
Form the figure shown, a flexible belt placed around a rotating drum of 4-inch radius acts as a brake when the arm ABCD is pulled down by the force P. The coefficient of kinetic friction between the belt and the drum is 0.7. What force P that would result in a braking torque of 400 lb . in., assuming that the drum is rotating Neglect the weight of the counterclockwise. brake arm. 60° 4 in. 60° A B C -2 in.²4in. 2 in. 42×-| -2 D P
The figure below shows a cylinder, which is rotating in clockwise direction. A lever is pushing onto the cylinder, thus exerting a braking torque. The lever itself is loaded by a force FE . a) Draw the free-body diagram of the lever, determine the direction of the kinetic friction force.
A flat belt passes over two idler pulleys and under a rotating drumof diameter 8 in. The axle of the drum is free to move vertically ina slot, and a spring keeps the drum in contact with the belt. Whatis the minimum force which should be exerted by the spring if slippageis not to occur when a 30-lb · ft torque is applied to the drum? Thecoefficient of static friction between belt and drum is 0.30 and theangle of contact is 180 degrees.
A car has hydraulically operated disc brakes at the front and drum brakes at the rear. The frontbrakes have pistons of 58 mm diameter each, whereas each of the wheel cylinder at the rearbrake has 28 mm diameter. The master cylinder piston has diameter of 40 mm. The brake footpedal has a leverage of 4. If the brake pedal is applied a force of 100 N, Calculate (i) The brakingforce on the front axle, (ii) The braking force on the rear axle.
4) Block B weighing 500 N rests on block A which weighs 300 N. The dynamic coefficient of friction be- tween contact surfaces is 0.4. At wall C there are rollers whose friction we can neglect. What is the ac- celeration of body A when a force F of 5000 N is ap- plied? F De gem B A 20°
The system shown below is made up of two pulleys attached to the same shaft, with radii ri and re of 0.29 mm and 0.43 mm, respectively. The total mass of the pulley system is 14 kg and its turning radius is 0.26 mm from its center. The mass of block A is 9 kg and the mass of block B is 2 kg. If the coefficient of kinetic friction between block B and the floor is 0.2, find the angular acceleration of the pulley.
Two blocks A and B are connected by a tope which wraps around a peg with static coefficient of friction of 02. The block B weighs 50-lb and is subjected to a 35-lb force as shown. The static coefficient of friction for the contact surface between the block and the ground is 0.4. Find the range of weight of block B for no motion. (Hint: no motion means no sliding and no tipping). A 18 in. 24 in. B 6 in. 35 lb
The uniform cylindrical drum D weighs 42.0 lb. The coefficient of static friction at all surfaces is 0.600, and the coefficient of kinetic friction is 0.500 at all surfaces. The cylinder is pushed by force P applied to a pad as shown, and it is intended for the cylinder to translate horizontally without rotation. a) Calculate the minimum force P required.b) Calculate the acceleration of the drum.
Page 6 of 8 8. Figure 7 shows a four-wheel drive car of mass m = 970 kg. The coefficients of friction is u=0.6. Neglect the mass of the tyres. (a) Determine the greatest possible acceleration of the race car so that its front tyres do not kave the ground nor the tyres slip on the track. (b) Determine the corresponding reactions on tyres A and B. (c) From (b) above, recalculate the coefficient of friction. If it is not same as either the given values H, or Hk, then in one sentence, state or explain why the difference in values? h=0.55 m a= 1.82 m B b = 2.20 m Figure 7 Page 7 of 8