8. Fig. 8 shows a simple aircraft landing gear, consisting of a spring and hydraulically loaded piston and cylinder D and the two pivoted links OB and CB. If the assembly is moving along the runway at a constant speed with the wheel supporting a stabilised constant load of 24 kN, calculate the total force that the pin at A supports.
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- 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.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.Solve Prob. 7.10 assuming that the pick-up truck has front-wheel drive.
- Draw the FBD for the bar described in Prob. 5.1 if the bar is homogeneous of mass 50 kg. Count the unknowns.For the same question, the Driving force (pressing force) of the Nut will be measured with the Torque wrench. While tightening the nut, the contact surface rubs against the fixed surfaces. Accordingly, how much MOMENT do we need to read from the Torque wrench in order to create a force of Fçak=1101 kgf? (Given: Screw pitch M30, Root diameter d1=25.8 mm) Outer diameter of the friction surface under the nut D42 mmFriction coefficient μ=0.6B r P F A UBC Engineering Your team is prototyping a simple braking system for your model car. The 3.4 kg wheel with a radius of r = rad 0.15 m is rotating at w = 18 - .A servo motor can apply a variable force F, which in its first two seconds of operation is equal to F = 10t N and afterwards is equivalent to a constant force of F = 20 N . If the coefficient of kinetic friction between the braking arm and the wheel is μ= 0.2, determine the time needed for the wheel to come to a full stop. The point of contact P between the wheel and the arm is a distance r = -0.2 + 0.26 ĵ m from point A. The force of the servo motor is applied at exactly half of the horizontal distance to A from the point of contact. Assume the wheel can be treated as a disk and that the braking arm is massless. t =
- Required information In a machining setup, workplece B, which weighs 10.5 lb, is supported by a fixed V block E and a clamp at A. All contact surfaces are frictionless, and the clamp applies a vertical force of 16 lb to the workplece. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. 30° 30° E Draw the free-body diagram needed to determine the reactions at points Cand D between the Vblock and the workplece. The free-body diagram of the workplece is2. 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 anThe figure shows a mechanism that raises packages in a transfer mechanism. A 200-N package sits on the horizontal output link O4BD while the crank O2A is rotating at constant speed of 287 rpm CCW. At the position shown the crank OA is vertical and the output link OB is horizontal. we need to determine the torque required from the motor at the crank O2A and the force in member AB The weights of the links are negligible. 50mm 450mm 200 N 200 mm B. 374 mm 300mm X The angular velocity of the link OĄBD in rad/s is = Choose... + The magnitude of the velocity of point D in m/s is = Choose... + The torque required from the motor at the crank O2A in N.m is = Choose... : The force in member AB in N is = Choose... +
- Equilibrium of Concurrent Force System. The piston of a reciprocating engine exerts a force of 175 kN on the crosshead when the crank is 45° (angle B) past TDC. If the stroke of the piston is 800 mm and the length of the connecting rod is 1.80 m, find the guide force and the force in the connecting rod. Hint: 1=½ stroke; Angle o may be solved using Sine Law in AACO. K= Compressive Force in the connecting Rod E= Piston Effort 70 120 F, = Guide Force Fig. P-1 Fig. P-2 a Tools: EF cos0=0; F sin .=0. R = Ev)* + (E#): ; R 771 =- : tane = sin A sin B sin CForm 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 PClutch Mechanism 8. In the clutch mechanism shown, two flat circular disks of radius R are mounted so that they can be brought into contact causing a net frictional force. The contact pressure in general depends on the distance from the center and in one specific case may be modeled buy P(r) = Poe-kr, where k is a constant and r is the distance from the center of the discs. The integral cR F = 2m " P(r)rdr gives the total contact force between the discs. Cross-section a. In your own words explain where this formula comes from.