raking torque applied?
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- The force P applied to the brake handle enables the band brake to reduce the angular speed of a rotating drum. If the tensile strength of the band is 3800 lb, find the maximum safe value of P and the corresponding braking torque acting on the drum. Assume that the drum is rotating clockwise.The square-threaded screw with a pitch of 10 mm and a mean radius of 18 mm drives a gear that has a mean radius of 75 mm. The static and kinetic coefficients of friction between the gear and the screw are 0.12 and 0.06, respectively. The input torque applied to the screw is C0=10Nm. Assuming constant speed operation, determine the output torque C1 acting on the gear.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.
- Calculate the horizontal force P required to push the 85-lb lawn mower at constant speed. The center of gravity of the mower is at G, and the coefficients of rolling resistance are 0.12 for the front wheels and 0.18 for the rear wheels.1. A 5.0kg steel block is resting on a horizontal table. The coefficient of static friction is 0.75 and coeficient of kinetic friction is 0.57. What is the maximum force that can be applied horizontally before it starts to move? 2. Three drums stacked as shown. Considering the weight of the drums and friction in all contact surfaces, how many forces are there in the FBD of A? (Friction and normal forces are treated separately.) (*see first image for the figure) 3. How many components (forces and couples) does a fixed support in 3D contain? (*see second image for the figure)Find the acceleration and tension in the string of the system shown in figure shown. Coefficient of the friction mu = 0.3 for all planes of the contact. Pulley is smooth. ANS: a = cm/s², T =
- Refer to Fig 33. The homogenous body A weighs 120 lb. The coefficients of frictions are 0.30 between A and the plane and 2/pi between the rope and the drum. What value of W will cause motion of A to impend? Give solution. (Ans. W= 81.5 lb)The width of the simple band brake shown in the figure is 30 mm. The coefficient of friction between the brake and the drum surface is 0.20. Determine the braking torque and thickness of the band if the tensile stress is not to exceed 65 N/mm2.A block brake with a torque of 250 N-m. Its drum rotates at 100 rpm. The length of the block (1) is twice its width (w). Assume, the coefficient of friction P is 0.35. Calculate: (1) the applied load (P) and the hinge-pin reaction (Rx ana Ry) for clockwise rotation of the drum; (2) the applied load and hinge-pin reaction for anticlockwise rotation of the drum; (3) the rate of heat generated during the braking action. (4) The dimensions of the block, if the intensity of pressure between the block and brake drum is 1 MPa. (5) Check whether the brake is self-locking.
- Two pulleys, one 650 mm diameter and the other 400 mm diameter, on parallel shafts 1.5 m apart are connected by a flat belt. Find the length of the belt required and the angle of contact between the belt and each pulley. What power can be transmitted by the belt when the larger pulley rotates at 1200 rev/min, if the maximum permissible tension in the belt is 10 kN, and the coefficient of friction between the belt and pulley is 0.05? dont write handwritten solution.While a vehicle with a mass of 2350 kg is moving at 120 km/h, suddenly braking It stops with an acceleration of -9.18 m/s2. There are two brake pads on each wheel of the vehicle. The friction coefficient between the brake pad and the brake disc is 0.3. During braking, assume 20 N/mm2 is the pressure on the brakke pad, find the area of the pad. Safety coefficient will be taken as 3For the drum brake shown in the following figure, there is an inner rim diameter of 280 mm and dimension a = 90 mm. The shoes have a face width of 30 mm. The force exerted by the cylinder hydraulic is 1000 N and the average coefficient of friction is 0.3. Determine: a) The maximum pressure in each shoe; b) The braking torque; c) Reactions resulting from the pivot pin;