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- Draw the FBD of the entire frame, assuming that friction and the weights of the members are negligible. How many unknowns appear on this FBD?13 cm 50 cm 2. The disk weighs 220 N and the bar weighs 110 N. The coefficients of friction between the disk and theWhat is the largest moment that can be applied without causing motion? The disk is 50 lb and the bar is 25 lb. The static friction is 0.6. Express your answer in in-lb (inch-pounds) with three significant figures. 5 in (5) force TOV M U from moving by exerting a horize 20 in 30° -ooges di 081 box of 08 styis m
- A screw jack is used to lift a load of 30 kN. The screw of the screw jack is square threaded with two threads of 1.2 cm. If the coefficient of friction between the nut and screw is 0.09 and the outer diameter of the screw is 6 cm, find the force required at the end of the handle of length 60 cm to lift that load.A uniform ladder of length 12 mand mass 30 kg rests with one ed on rough horizontal ground and the other end against a smooth vertical wall. The ladder is indined 65°. The coefficient of friction, H, between the ladder and the ground is 0.35. A woman of mass 65 kg is slowly dimbing up the ladder. She wants to know how far up the ladder she can dimb safely. Drawa diagramshowing all the force adting on the ladder when the woman is x metres fromthe foot of the ladder. (a) (b) Find the reaction of the ground on the ladder. (c) Show that the reaction of the wall on the ladder is less than 33.25g By taking moments about the base of the ladder, find how far up th ladder she an dimb safely. (d)2. In Fig. P-519/p. 127, two blocks are connected by a solid strut attached to each block with frictionless pins. If the coefficient of friction under each block is 0.25 and B weighs 270 lb., find the minimum weight of A to prevent motion. F1o. P-519, P-620, and P-521. II
- 1. A bus model with 5kg mass being pulled horizontally against a friction force of 0.5N. Draw the Free Body Diagram and calculate the work done of the bus being pulled for a 13m distance. FEMERBAHÇE NC E 1907 1907 Emira 50N FENERBANCEYİE 30° CORSELA block and sphere are connected by a cord that passes over a pulley as shown. Neglect friction and assume the cord is massless. Take m1 = 2.00 kg, m2 = 7.65 kg, and ? = 49.0°. A triangular structure is oriented such that its base rests upon a horizontal surface, its left side is perpendicular to its base, and its right side forms an incline of angle ?. A pulley is attached to the structure's apex. Two objects are connected by a cord that passes over the pulley. A circular object labeled m1 is attached to the to the left end of the cord and hangs freely. A rectangular object labeled m2 is attached to the end of the cord and rests upon the incline. (a) What are the magnitude of acceleration (in m/s2) of the block and sphere? _____m/s2 (b) What is the tension (in N) in the cord? (Enter the magnitude.) ____N (c) What is the speed (in m/s) of each object 2.25 s after being released from rest? ____m/s (d)What If? If the incline under m2 is rough, what is the minimum value…An engineer is designinga conveyor system for loading haybales into a wagon (Fig.).Each bale is 0.25 m wide, 0.50 mhigh, and 0.80 m long (the dimensionperpendicular to the plane ofthe figure), with mass 30.0 kg. Thecenter of gravity of each bale is atits geometrical center. The coefficientof static friction between abale and the conveyor belt is 0.60, and the belt moves with constantspeed. (a) The angle b of the conveyor is slowly increased. At somecritical angle a bale will tip (if it doesn’t slip first), and at some differentcritical angle it will slip (if it doesn’t tip first). Find the twocritical angles and determine which happens at the smaller angle. (b)Would the outcome of part (a) be different if the coefficient of frictionwere 0.40?
- There is a box with height 1.2 m, width 0.8 m and mass 50 kg. It contains a very expensive equipment, which cannot be tilted while moving. There is a rope connected to the top-right corner of the box that you can pull with. The static friction coefficient between the floor and the box is 0.4. Assuming the rope angle θ is 30 degrees and m/s2. a) Is it possible to move the box using the rope without tilting the box? (need to show details) b) What is the minimum force required to move the box on the floor?The figure shows a pair of pin-jointed gripper-tongs holding an object weighing 2000 N. The coefficient of friction (u) at the gripping surface is 0.1. XX is the line of action of the input force and YY is the line of application of gripping force. If the pin- joint is assumed to be frictionless, the magnitude of force Frequired to hold the weight is F Pin Y- 2000 N 150mm ww 00Q2 (a) Discuss briefly the various types of friction and explain your classification. (b) A body resting on a 15° inlined plane required a pull of 2400N to move. If the body resting on a 20° inlined plane, required a pull of 2000N force for it to move. If both forces are acting parallel with the inclined plane, find: (i) coefficient of friction, (ii) weight of the body