A 340N force parallel to an inclined plane is required to just move a body of mass 50kg up the plane which is inclined at 15 above the horizontal. Calculate the coefficient of friction and the force parallel to the plane required to drag the body down the plane at constant speed.[15 marks]
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A 340N force parallel to an inclined plane is required to just move a body of mass 50kg up
the plane which is inclined at 15 above the horizontal. Calculate the coefficient of friction and
the force parallel to the plane required to drag the body down the plane at constant speed.
[15 marks]
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- 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.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.Required information A photograph of the NASA Apollo 16 Lunar Module (abbreviated by NASA as the LM) is shown on the surface of the Moon. Such spacecraft made six Moon landings during 1969 - 72. A simplified model for one of the four landing gear assemblies of the LM is shown. Assume the weight of the LM is uniformly supported by all four landing gear assemblies, and neglect friction between the landing gear and the surface of the Moon. NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A (2.5, 2.5, -2.2) m B (1.5, 1.5,0) m C(2, 1,-1.2) m D(1,2,-1.2) m Z B D If the LM has 14950 kg mass and rests on the surface of the Moon where acceleration due to gravity is 1.62 m/s2, determine the forces supported by members AB, AC, and AD. (Round the final answers to four decimal places. Include a minus sign if necessary.) The forces supported by members AB, AC, and AD are as follows: TAB 10621 N TAC= 2903 N TAD 6032 N
- A 2-t mass rests on a horizontal surface. Calculate the horizontal force, in kilonewtons, required to move this mass at a uniform speed along the surface if the coefficient of friction is 0-35.You need to move a cubic crate across a rough floor. You pull the crate horizontally using a rope with force F, as shown in Figure 1. The weight of the crate is 700 lb:, its density is 180 lbm/fts, and the coefficient of static friction between the crate and the floor is 0.57. Write an expression for the maximum static friction force fmax (in lb:) as a function of the mass m of the crate. Use Excel to plot fmax(m). Calculate the average pressure of the crate on the floor, in psi. Calculate the minimum force F necessary for the crate to start moving, in lb;. F Figure 1. Moving a crate on a slope.A dictionary is pulled to the right at constant velocity by a 10 N force acting 30° upward above the horizontal. The coefficient of kinetic friction between the book and the horizontal surface is 0.5. What is the weight of the book?
- A block is pulled along a rough level surface at constant speed by the force P. The figure shows the free-body diagram for the block. FN represents the normal force on the block; and / represents the frictional force. If the coefficient of kinetic friction, HR , between the block and the surface is 0.30 and the magnitude of the frictional force is 80.0 N, what is the magnitude of the normal force FN? mg OA 410 N OB 160 N OC 1.6 N OD.4.0 NA OE 270 NFind the angle of banking for a highway curve of 300-ftradius designed to accommodate cars travelling at speed ofup to 120 mph, if the coefficient of friction between thetires and the road is 0.60. What is theminimum speed in miles per hour (mph) at which a carcan round the curve without slipping?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 an
- The diagram below represents an elevator used to lift concrete blocks to upper levels on a construction site. The belt travels at a velocity of 0.9 m/s and is inclined at 26° above the horizontal plane. A yolluy € ф 300 mm 008 to NOT TO SCALE alaups 1909 provided to come Calculate the frictional force and the coefficient of friction between each block and the belt. Each block weighs 16.5 kg. Frictional Force: N Coefficient of Friction: ..........Consider a 14.5 kg rectangular block of length 0.40 m attached to a spring with a spring constant of 30.5 N/m. The coefficient of static friction between this block and the surface is 0.310.1. A force of 69N is needed to start an 6.9kg box moving across a horizontal surface. Calculate the coefficient of static friction. If the box continues to move with an acceleration of 1.69 m/s2. What is the coefficient of kinetic friction? 2. A box of 45ON is lying in an inclined plane with angle of 35 degrees. If the applied load to move the box is 269N. Determine the net Ff and the acceleration of the box if the coefficient of static friction is 0.35 and the coefficient of kinetic friction is 0.28.