PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Chapter 8, Problem 4RP
To determine
The minimum force that should be applied to the follower in order to hold the cam in the given position.
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The light bar is used to support the
50-kg block in its vertical guides. If
the coefficient of static friction is
0.30 at the upper end of the bar and
0.40 at the lower end of the bar, find
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50 kg
A
300 mm
8-63. Determine the minimum applied force P required to move wedge A to the right. The
spring is compressed a distance of 175 mm. Neglect the weight of A and B. The coefficient of
static friction for all contacting surfaces is µ = 0.35. Neglect friction at the rollers.
Problems 8-62/63
k = 15 kN/m
A
OO
10°
The three identical rollers are stacked on a horizontal surface as shown. If the coefficient of static friction µ is the same for all pairs of
contacting surfaces, find the minimum value of μs for which the rollers will not slip.
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Answer: Us=
Chapter 8 Solutions
PEARSON ETEXT ENGINEERING MECH & STATS
Ch. 8 - F81. Determine the friction developed between the...Ch. 8 - F82. Determine the minimum force P to prevent the...Ch. 8 - Prob. 3FPCh. 8 - F84. If the coefficient of static friction at...Ch. 8 - F85. Determine the maximum force P that can be...Ch. 8 - F86. Determine the minimum coefficient of static...Ch. 8 - F87. Blocks A, B, and C have weights of 50 N, 25...Ch. 8 - F88. If the coefficient of static friction at all...Ch. 8 - Prob. 9FPCh. 8 - Determine the maximum force P the connection can...
Ch. 8 - The mine car and its contents have a total mass of...Ch. 8 - Prob. 4PCh. 8 - The automobile has a mass of 2 Mg and center of...Ch. 8 - The automobile has a mass of 2 Mg and canter of...Ch. 8 - Prob. 9PCh. 8 - Determine the angle at which the applied force P...Ch. 8 - Prob. 12PCh. 8 - The car has a mass of 1.6 Mg and center of mass at...Ch. 8 - The log has a coefficient of state friction of, s...Ch. 8 - The spool of wire having a weight of 300 Ib rests...Ch. 8 - The spool of wire having a weight of 300 Ib rests...Ch. 8 - Prob. 20PCh. 8 - The uniform thin pole has a weight of 30 Ib and a...Ch. 8 - The uniform pole has a weight of 30 Ib and a...Ch. 8 - The friction pawl is pinned at A and rests against...Ch. 8 - Two blocks A and B have a weight of 10 Ib and 6...Ch. 8 - Two blocks A and B have a weight of 10 Ib and 6...Ch. 8 - Determine the smallest force P that must be...Ch. 8 - The man having a weight of 200 Ib pushes...Ch. 8 - The uniform hoop of weight W is subjected to the...Ch. 8 - Determine the maximum horizontal force P that can...Ch. 8 - Determine the minimum force P needed to push the...Ch. 8 - Prob. 41PCh. 8 - Prob. 42PCh. 8 - Prob. 51PCh. 8 - Prob. 52PCh. 8 - Determine the smallest couple moment that can be...Ch. 8 - If P=250 N, determine the required minimum...Ch. 8 - Determine the minimum applied force P required to...Ch. 8 - Prob. 67PCh. 8 - Prob. 68PCh. 8 - Prob. 71PCh. 8 - Prob. 72PCh. 8 - Prob. 73PCh. 8 - Prob. 74PCh. 8 - Prob. 81PCh. 8 - Determine the horizontal force P that must be...Ch. 8 - A 180-lb farmer tries to restrain the cow from...Ch. 8 - The 100-lb boy at A is suspended from the cable...Ch. 8 - Prob. 87PCh. 8 - Determine the force P that must be applied to the...Ch. 8 - Prob. 93PCh. 8 - Prob. 98PCh. 8 - Prob. 99PCh. 8 - Blocks A and B have a mass of 7 kg and 10 kg,...Ch. 8 - The uniform bar AB is supported by a rope that...Ch. 8 - Prob. 102PCh. 8 - A 10-kg cylinder D, which is attached to a small...Ch. 8 - Prob. 106PCh. 8 - The collar bearing uniformly supports an axial...Ch. 8 - The collar bearing uniformly supports an axial...Ch. 8 - The floor-polishing machine rotates at a constant...Ch. 8 - Prob. 110PCh. 8 - Prob. 111PCh. 8 - Prob. 116PCh. 8 - The collar fits loosely around a fixed shaft that...Ch. 8 - Prob. 119PCh. 8 - Prob. 120PCh. 8 - Solve Prob. 8-120 if the force P is applied...Ch. 8 - Prob. 122PCh. 8 - Prob. 123PCh. 8 - Prob. 125PCh. 8 - The bell crank fits loosely into a 0.5-in-diameter...Ch. 8 - The bell crank fits loosely into a 0.5-in-diameter...Ch. 8 - Prob. 129PCh. 8 - R81. The uniform 20-lb ladder rests on the rough...Ch. 8 - R82. The uniform 60-kg crate C rests uniformly on...Ch. 8 - R83. A 35-kg disk rests on an inclined surface for...Ch. 8 - Prob. 4RPCh. 8 - Prob. 6RPCh. 8 - Prob. 7RPCh. 8 - The hand cart has wheels with a diameter of 80 mm....
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- The pivot bearing is subjected to a parabolic pressure distribution at its surface of contact. If the coefficient of static friction is μk, determine the torque M required to overcome friction and turn the shaft if it supports an axial force P.arrow_forwardThe 50-Ib cylinder is attached to a cord which passes over the drum. If the coefficient of static friction at the drum is Ms = 0.3, determine the maximum vertical force P that can be applied to the roller when 0 = 30° without causing the cylinder to move.arrow_forwardThe wheel is subjected to a torque of M = 50 N If the coefficient of 0 kinetic friction between the band and brake and the rim of the wheel is 4k=0.3, determine the smallest horizontal force P that must be applied to the lever to stop the wheel.arrow_forward
- Determine the greatest angle 0 so that the ladder does not slip when it supports the man (of the mass of m) in the position shown. The coefficient of static friction at A and B is Hs. Ignore the weight of the ladder. Use m = 93 kg, Hs = 0.48, a=2.5m, b=0.25m, g = 9.81 m/s?. b a e to the nearest integer (deg) =arrow_forwardDetermine the minimum applied force P⃗ P→ required to move the wedge AA to the right. The sping is compressed a distance of 200 mm. Neglect the weight of AA and BB. The coefficient of static friction for all contacting surfaces is μs=0.3μs=0.3. Neglect friction at the rollers.arrow_forwardThe brake is to be designed to be self locking, that is, it will not rotate when no load P is applied to it when the disk is subjected to a clockwise couple moment Mo. Determine the distance d of the lever that will allow this to happen. The coefficient of static friction at B is µs = 0.5. P -1.5 ft B Mo 1 ft 1.5 ftarrow_forward
- The 104-lb force Pis applied to the 220-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume 4, = 0.47, Hz = 0.38. Answer: F = Ibarrow_forwardThe wheel is subjected to a torque of M 50 N m. If the coefficient of kinetic friction between the band brake and the wheel rim is equal to 0.3, determine the smallest horizontal force P that must be applied to the lever to stop the wheel.arrow_forwardThe coefficients of static and kinetic friction between the drum and brake bar are μS= 0.4 and μK= 0.3, respectively. If M= 50 N.m and P= 85 N. determine the horizontal and vertical components of reaction at the pin O (shown in Fig. 3). Neglect the weight and thickness of the brake. The drum has a mass of 25 kg.arrow_forward
- roll of paper has a uniform weight of 2kN and is suspended from the wire hanger so that it rests against the wall. If the hanger has a negligible weight and the bearing at O can be considered frictionless, determine the force P needed to start turning the roll if = 30°. The coefficient of static friction between the wall ܬܐ and the paper is µ = 0.3.arrow_forward8-85. A 180-lb farmer tries to restrain the cow from escaping by wrapping the rope two turns around the tree trunk. If the cow exerts a force of 250 lb on the rope, determine if the farmer can successfully restrain the cow. The coefficient of static friction between the rope and the tree trunk is µ = 0.15, and between the farmer's shoes and the ground us = 0.3. Problem 8-85 E mm3 the { m}arrow_forwardThe figure shows a part of a machine used to crush recycled cans. Link ABC is attached to the ground at pin A and link BD is attached to the piston D using also a pin connection. When α=45°, θ=55°, and β=15°, the machine is about to start moving, i.e. impending motion. If the coefficient of static friction and kinetic friction between the piston D and the wall are μs=0.25 and μk=0.2 respectively, find the magnitude of force applied to the cans by the piston for P=200 kN.arrow_forward
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