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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 homogeneous plate of weight W is supported by a ball-and-socket joint at D and three wires. Draw the FBD of the plate and count the unknowns.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 layout shown is a representation of a machine shop. Components 1 and 2 have masses of m1=265kg and m2=220kg , respectively. Component 3 must be treated as a distributed load, which is w=175 kg/m2 , determined by the area of contact between the component and the shop floor. The dimensions shown have been measured to be a=0.600 m , b=2.00 m , c=1.60 m , d=0.650 m , e=3.10 m , and f=1.10 m . These dimensions represent the x and y components of the locations of the centers of gravity for the respective components. Component 3 has x,y cross-sectional dimensions of x3=1.30 m and y3=0.250 m . Assume the components experience uniform weight distribution in all principle directions. The dimensions a through f locate the centroid of the respective component from the y−z plane and x−z plane.(Figure 1) Part A - The x Component of the Center of Gravity of All the Components Determine the x component of the center of gravity of all the components. Express your answer to three significant…. The small piston of a hydraulic lift (g. 1) has a cross-sectional area of 3.00cm2, and its large piston has a cross-sectional area of 200cm2. What downward force of magnitude F1 must be applied to the small piston for the lift to raise a load whose weight is Fg = 15.0kN?One end of a post weighing 400 Nand with height h rests on a roughhorizontal surface with ms = 0.30.The upper end is held by a ropefastened to the surface and makingan angle of 36.9° with the post. A horizontal force F isexerted on the post as shown. (a) Ifthe force F S is applied at the midpointof the post, what is the largest value it can have without causing the postto slip? (b) How large can the force be without causing the post to slip ifits point of application is 6/10 of the way from the ground to the top of thepost? (c) Show that if the point of application of the force is too high,the post cannot be made to slip, no matter how great the force. Find thecritical height for the point of application.
- A flat belt connects pulley A to pulley B. The coefficients of friction are μs = 0.25 and μk = 0.20 between both pulleys and the belt. Knowing that the maximum allowable tension in the belt is 4 kN, determine the largest torque which can be exerted by the belt on pulley A. The radius of the bigger pulley A is R = 203 mm and the radius of the smaller pulley B is r = 25.4 mm. Calculate the resulting bearing force in A.A former student of mechanics wishes to weigh himself but has access only to a scale A with capacity limited to 100 lb and a small 20-lb spring dynamometer B. With the rig shown he discovers that when he exerts a pull on the rope so that B registers 19 lb, the scale A reads 67 lb. What is his correct weight?d = 30 mm diameter, solid, ductile no.11 m from end A of vertical shaft AB made of materialtightly fitted to a radius disc, at end B to the groundfixed. From the C point of the disk - parallel to the y axisA force of F = 20 kN will be applied. Safety of the shaftcontrol according to Tresca criterion and Von-Mises criteriondo. (Due to the tight fit, the shaft is in the hole in the disc.cannot rotate freely.)
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