A turnbuckle, which is used to adjust tension in cables, is subjected to tension T=184.7 N as shown. The two opposite-handed single-start square-treaded screws have a lead of 0.005 m, nominal diameter of 0.04 m, and the coefficient of friction u=0.17. For the given tension value, calculate the torque required on the turnbuckle along its axis to
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- 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 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 ladder is L=5.0m long and weighs 400.0 N. The ladder rests against a slippery vertical wall, as shown. The inclination angle between the ladder and the rough floor is β=53°.Find the normal forces from the floor and from the wall on the ladder and the coefficient of static friction μs at theinterface of the ladder with the floor thatprevents the ladder from slipping
- The hand brake of Fig. is used to control the rotation of a drum. The coefficient of friction between the belt and the drum is , = 0.15, and the weight of the handle may be neglected. If a counterclockwise torque of 5 ft - Ib is applied to the drum Repeat the problem for a clockwise torque of 5 ft · Ib. What happens to the system at a 4.6 in.? What does the solution mean for a> 4.6 in.? M= 5 lb-ft -12 in. 12 inA ladder of length 2L and mass M is positioned on level ground leaning against a wall such that the angle between the ladder and the horizontal is @. The coefficient of static friction between the ladder and the wall and between the ladder and the ground is jistatic = 0.66. The centre of mass of the ladder is halfway along it. For the ladder to be in mechanical equilibrium: Consider torques about the centre of the ladder. In which direction (into or out of the page) does the torque due to each of the 5 forces force act?Write down an equation for the sum of the torques about the centre or mass of the ladder and then use your equation for the torques to derive an expression for tan o in terms of the magnitudes of the forces actingThe band wrench of Fig. an oil filter from a car. (The filter acts as if it were a wheel with a resisting torque of 40 lb ft.) Determine the mini- mum coefficient of friction between the band and the filter that will prevent slippage. The weight of the handle can be neglected. is used to unscrew 40 Ib-ft 2.5 in. -2 in. 7.5 in.
- We are experimenting with a brake system. Bar AC rests on the spool at B. Find the force P that can be applied to the cord that is wrapped around the smaller radius of the spool. The spool is frictionless. Only consider friction occurring at point B. The coefficient of static friction at B is 0.37. A 250 lb 1211+ -2 ft- -211--111-1 Radius=9 in.. B P C Radius= 15 in.2. A square threaded screw of mean diameter 25 mm and pitch of thread 6 mm is utilised to lift a weight of 10 kN by a horizontal force applied at the circumference of the screw. Find the magnitude of the [Ans. 966 N] force if the coefficient of friction between the nut and screw is 0.02. A bolt with a squore threaded screw has mean diameter of 25 mm and a nitch of 23 mm It carries anA 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.
- In the old-fashioned printing press of Fig. square-threaded screw is used to press the paper against the type bed. The single-threaded screw has a mean radius of 20 mm and a lead of 100 mm. The coefficient of friction is 0.15, and the clamping force necessary to guarantee clear printing on all parts of the paper is 400 N. Determine the twisting moment necessary to operate the press and whether or not a moment must be applied to release the press. PQ4/From the figure below, ,if the mass of box is 10 kg, the coefficient of friction u=0.4. Draw the free body diagram. Does it will slip or not and tip or not? Why? P = 80 N 30° 0.2 m -0.8 mThe winch in the figure is used to move the 135kg uniform log. The coefficient of static friction between the log and the plane is 0.40. Which of the following most nearly gives the value of T for impending tipping?