A car with mass 1600 kg and negligible aerodynamics is braking on an asphalt with global longitudinal friction coefficient 0.75. What is the maximum possible deceleration?
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- What is the safe maximum speed without tipping or skidding for a 13,200 N automobile running around a flat curve of 80 m radius? Its center of gravity is 0.60 m above the road surface and the wheel tread is 1.5 m, and f = 0.50.The tensions of a flat belt are;tight side 500N and slack side 180N.the angular speed N and diameter D of the pulley are 280rev/min and 20cm respectively.if the coefficient of friction between the belt and the pulley 0.6 and the mass m of the belt is 1.2kg/m, including centrifugal tension, Determine; (a) initial tension of the belt (b) angle of lap in degrees (C) power transmitted in the kilowatt (D) maximum power attainable in kilowattQ5 A pull of 20 N at 30 ° to the horizontal is necessary to move a block of wood on a horizontal table . If the coefficient of friction between the bodies in contact is 0.25 , what is the weight of the block ?
- 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?On a runway of a decommissioned airport, a 2000 kg car travels at a constant speed of 100 km/h. At 100 km/h the air drag on the car is 1400 N. Assume that rolling friction is neglie (a) What is the force of static friction exerted on the car by the runway surface, and what is the minimum coefficient of static friction necessary for the car to sustain this spe As, min (b) The car continues to travel at 100 km/h, but now along a path with radius of curvature r. For what value of r will the angle between the static friction force vector and th velocity vector equal 45.00? r = For what value of r will it equal 75.1°? r = What is the minimum coefficient of static friction necessary for the car to hold this last radius of curvature without skidding? As, min = eBook(II) A 25.0-kg box is released on a 27° incline and accelerates down the incline 0.30 m/s2at Find the friction force impeding its motion. What is the coefficient of kinetic friction?
- The two ramps pictured here each have a region of length L with kinetic friction coefficient uk and are otherwise frictionless. Identical masses m start at identical heights up the ramps, with the same initial velocity down the ramp. How do their final speeds compare when they reach the far right-hand side? (The answer requested here is qualitative and does not require detailed calculation). L m m Vi #0 Vi O Mass is moving faster in #1 The masses are moving at the same speed. Mass is moving faster in #2 O There is not enough information to decide. L Mk#0 1 2 m m Vf,1 V₁,2Consider the system shown below. The incline plane is fixed and the coefficient kinetic friction between M and 2M is ?1, and coefficient kinetic friction between the plane and 2M is ?2. Let M=2.0kg, ?=22o, ?1=0.14, and ?2=0.25. (a) What is the magnitude of the frictional force on mass M? (b) What is the magnitude of the total frictional force on mass 2M? (c) What is the acceleration of mass M? (d) What is the acceleration of mass 2M?Two blocks having the weights and positions shown in Fig. P-1243 rest upona frame which rotates about its vertical axis at a constant speed. Thecoefficient of friction between the blocks and the frame is 0.20. The weightand friction of the pulley being neglected, at what speed in rpm will theblocks start to slide2 What is the tension in the cord at this instant?
- A pulley 1 m in diameter rotating at 300 r.p.m is brought to rest in 80 s. By constant force of friction on its shft. How many revolutions does it moves?a 46 l Asiacell B/s Z 509-two-blocks-in... DRAW F. B. D AND SHOWTHE DIRECTION OF FRICTION FORCE 3000 N MATHlino com B Figure P-509 2000 NQ2 A sluice gate weighing (1.8tonnes) is raised and lowered using a square thread screw. The frictional resistance induced by water pressure against the gate when it lowers its position is 400Kg. The outside diameter of the screw is (6cm) and the pitch is (1cm). The outside and inside diameters of the washer are (15cm and 5cm) respectively. The coefficient of friction between the screw and nut is (0.1) and between the washer and seat is (0.12). Requirements: 1) Calculate the maximum force to be exerted at the end of the lever for raising and lowering the gate. 2) Efficiency of arrangement. 3) Number of thread and height of the nut, an allowable bearing pressure is 70Kg/cm². HA Thrust washer Nut Screw