PEARSON ETEXT ENGINEERING MECH & STATS
15th Edition
ISBN: 9780137514724
Author: HIBBELER
Publisher: PEARSON
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Question
Chapter 8, Problem 98P
To determine
Whether the frictional relationship between the belt tensions, the coefficient of friction
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The masses of the blocks are mA = 30 kg and mB = 70 kg. Between all of the
contacting surfaces the coefficient of static friction is 0.1.
1. What is the largest force F that can be applied without causing the blocks
to slip?
2. What is the reaction between the two blocks?
3. What is the reaction between the floor and block B
Calculate the maximum force P that can be applied without causing any
motion for the given coefficients of static friction. The weight of block A is 20
lb. and that of B is 10 lb.
MB = 0.4
2 ft.
B
A
3 ft.
MA=0.5
P
MD=0.3
D
Pc=0.35
C
Problem 1
The
downhill racer team is testing a new design. There
are 4 wheels each with a diameter of 0.4 m and a mass of 2.0
kg. The rest of the cart has a mass of 20 kg. A spring-loaded
brake applies a constant force of 50 N on the two rear wheels.
The coefficient of friction between a brake pad and a wheel is
0.7. The cart is traveling down a slope of 0 = 10° at 13.5
km/hr when the brake is applied. Determine how far the racer
will travel down the slope until it stops. Model the wheels as
uniform thin discs.
G
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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- Determine for what least value of the pulling force P and angle θ, in the system as shown below, to cause the motion of the blocks to impend from left to right ? Assume the pulley to be smooth and coefficient of friction between the mating surfaces be 0.20. The weight of block A is 90 N while weight of block b is 60 N. OPTIONS:(MULTI CORRECT(MAY BE)): 1.Angle θ is around 6 Degrees 2.Force P is approximately 72 N 3.Angle θ is around 15 Degrees 4.Angle θ is around 11 Degrees 5.Angle θ is around 17 Degrees 6.Force P is approximately 81 N 7.Force P is approximately 102 N 8.Angle θ is around 8 Degree 9.Force P is approximately 94 Narrow_forwardDetermine the coefficient of static -friction force (µs) if ᴓs= 45?arrow_forwardT (N) 5000 N A T T= 500 t t (s) t1 te 12 The coefficients of static friction and kinetic friction are 4, = 0.3 and 44 = 0.2, respectively, between the crate and the surface. The motor is towing the 1000 kg crate and rests on the flat surface. It delivers an increasing horizontal pulling force of T = 500 t5² Newton, where t is in second, to its cable at A, after which the force is kept constant at 5000 N. Determine the velocity (m/s) of the crate when t2 = 5 s.arrow_forward
- 1. What is the relationship between the force pulling the slider up the incline and the coefficient of friction? 2. How does angle θ affect the value of coefficient of friction? 3. What is the relationship between μ and Φ?arrow_forward3. Blocks A and B have a mass MA and MB, respectively. If the coefficient of static friction between A and B and between B and C is us and between the ropes and the pegs D andE µ's, determine the smallest force F needed to cause motion of block B. Given: E e = 45 deg Hs = 0.25 MA = 100 kg He's = 0.5 Mв 3 150 kg Р%3 30 N B m g = 9.81arrow_forwardAn acrobat weighing 150 KN supports himself by wrapping a rope around one leg . From his leg there hangs 5 m of rope which weighs 0.40 KN/m. What is the minimum coefficient of friction between his leg and the rope? Neglect his pull on the rope. a. µ = 0.786 b. µ = 0.688 c. µ = 0.695arrow_forward
- 2. An engine developing 45 kW at 1000 rpm is fitted with a cone clutch built inside the flywheel. The cone has a face angle of 12.5° and a maximum mean diameter of 500 mm. The coefficient of friction is 0.2. The normal pressure on the clutch face is not to exceed 0.1 N/mm2. Determine: a. the face width required, and b. the axial spring force necessary to engage the clutch.arrow_forwardThe coefficient of static friction between the 65-lb roller and the ground is μ = 0.2. Fins the greatest force P that can be applied to the handle to that the roller rolls on the ground without slipping. The roller can be assumed to be a uniform cylinder. Note: when a wheel rolls without slipping, the point of contact between the wheel and the ground is stationary, so the static coefficient of friction is used. 40° 3 ftarrow_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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