International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN: 9781305501607
Author: Andrew Pytel And Jaan Kiusalaas
Publisher: CENGAGE L
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Textbook Question
Chapter 7, Problem 7.38P
Two concrete blocks weighing 320 lb each form part of the retaining wall of a swimming pool. Will the blocks be in equilibrium when the pool is filled and the water exerts the line loading shown?
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2 A metal block of mass m = 10 kg is sliding along a frictionless surface with an initial speed
Vo, as indicated below. The block then slides above an electromagnetic brake that applies a
force FEB to the block, opposing its motion. The magnitude of the electromagnetic force
varies quadratically with the distance moved along the brake (x):
10
FEB = kx²,
with k
= 5
N
m²
V₁ = 8 m/s
m = 10 kg
FEB
Frictionless surface
Electromagnetic brake
⇒x
Determine how far the block slides along the electromagnetic brake before stopping, in m.
Q1: Determine the length, angle of contact, and width of a 9.75 mm thick
leather belt required to transmit 15 kW from a motor running at 900 r.p.m. The
diameter of the driving pulley of the motor is 300 mm. The driven pulley runs at
300 r.p.m. and the distance between the centers of two pulleys is 3 meters. The
density of the leather is 1000 kg/m³. The maximum allowable stress in the
leather is 2.5 MPa. The coefficient of friction between the leather and pulley is
0.3. Assume open belt drive.
5. A 15 kW and 1200 r.p.m. motor drives a compressor at 300 r.p.m. through a pair of spur gears having
20° stub teeth. The centre to centre distance between the shafts is 400 mm. The motor pinion is made
of forged steel having an allowable static stress as 210 MPa, while the gear is made of cast steel
having allowable static stress as 140 MPa. Assuming that the drive operates 8 to 10 hours per day
under light shock conditions, find from the standpoint of strength,
1. Module; 2. Face width and 3. Number of teeth and pitch circle diameter of each gear.
Check the gears thus designed from the consideration of wear. The surface endurance limit may be
taken as 700 MPa. [Ans. m = 6 mm; b= 60 mm; Tp=24; T=96; Dp = 144mm; DG = 576 mm]
Chapter 7 Solutions
International Edition---engineering Mechanics: Statics, 4th Edition
Ch. 7 - Can the two blocks be in equilibrium in the...Ch. 7 - Determine the range of P for which the system of...Ch. 7 - Two identical chairs, each weighing 14 lb, are...Ch. 7 - The two homogeneous bars AB and BC are connected...Ch. 7 - The contact surface between the 36-lb block and...Ch. 7 - The uniform bar AB of weight W is leaning against...Ch. 7 - The center of gravity of the 50-kg spool is at G....Ch. 7 - The brake pads at C and D are pressed against the...Ch. 7 - The 200-lb homogenous cylinder of radius R is...Ch. 7 - The rear-wheel-drive pickup truck, with its center...
Ch. 7 - Solve Prob. 7.10 assuming that the pick-up truck...Ch. 7 - The 2-lb bar is pinned at A and rests on the 4-lb...Ch. 7 - The horizontal force P acts on the rim of the...Ch. 7 - The uniform bar and the homogeneous cylinder each...Ch. 7 - A stepladder consisting of two legs pinned...Ch. 7 - The mass of the unbalanced disk is m, and its...Ch. 7 - The two uniform sheets of plywood, each of length...Ch. 7 - Find the largest value of b/h at which the folding...Ch. 7 - The 3600-lb car with rear Wheel drive is...Ch. 7 - The 3600-lb car with rear wheel drive is...Ch. 7 - The man is trying to push the homogeneous 20-kg...Ch. 7 - A 1.1-kg disk A is placed on the inclined surface....Ch. 7 - The 40-lb spool is suspended from the hanger GA...Ch. 7 - A uniform plank is supported by a fixed support at...Ch. 7 - The uniform bar of weight W is supported by a...Ch. 7 - The uniform plank is initially at rest on the...Ch. 7 - The two homogeneous bars with the weights shown...Ch. 7 - The man pushes the 120-lb homogeneous crate with...Ch. 7 - The 80-kg crate has its center of gravity at G....Ch. 7 - Solve Prob. 7.29 if =0.Ch. 7 - The 120-lb door with its center of gravity at G is...Ch. 7 - Determine the largest force P for which the 16-kg...Ch. 7 - Determine the largest angle for which the...Ch. 7 - The cylinder and the block are connected by a...Ch. 7 - The weight of the cylindrical tank is negligible...Ch. 7 - The coeffient of static friction between the...Ch. 7 - The two homogenous boxes are stacked vertically....Ch. 7 - Two concrete blocks weighing 320 lb each form part...Ch. 7 - Derive the expression for the largest angle ? for...Ch. 7 - The 60-lb plank rests on a frictionless roller at...Ch. 7 - The 2000-lb weight of the trailer is distributed...Ch. 7 - Determine the smallest force P, applied to the...Ch. 7 - The homogenous cylinder of weight W is at rest...Ch. 7 - The uniform bar of length L and weight W is kept...Ch. 7 - The movable bracket of negligible weight is...Ch. 7 - The 200-lb man walks up the inclined plank of...Ch. 7 - Determine the smallest coefficient of static...Ch. 7 - Find the smallest distance d for which the hook...Ch. 7 - Prob. 7.49PCh. 7 - The block of weight W is pulled by the force P...Ch. 7 - The two 200-lb blocks are pushed apart by the 15...Ch. 7 - Determine the smallest horizontal force P that...Ch. 7 - The device shown is used to measure the kinetic...Ch. 7 - The single-threaded screw of the floor jack has a...Ch. 7 - A wedge is used to prop up the 6000-lb block of...Ch. 7 - The square-threaded screw 0f the C-clamp has a...Ch. 7 - The square-threaded screw with a pitch of 10 mm...Ch. 7 - The screw of the carjack has a pitch of 0.1 in....Ch. 7 - How many turns of rope around the capstan are...Ch. 7 - The force P applied to the brake handle enables...Ch. 7 - Prob. 7.61PCh. 7 - The 120-kg block A is suspended from a rope that...Ch. 7 - The leather rein used to fasten the horse to the...Ch. 7 - The 30-lb weight is attached to a rope that runs...Ch. 7 - The rail AB of negligible weight is suspended from...Ch. 7 - The blocks A and B of weights WA and WB are joined...Ch. 7 - The 150-lb weight is attached to a rope that...Ch. 7 - The 50-lb homogeneous bar AB is suspended from a...Ch. 7 - The collar bearing carries the axial load P = 400...Ch. 7 - Solve Sample Problem 7.16 if the contact pressure...Ch. 7 - The 600-lb cable spool is placed on a frictionless...Ch. 7 - Prob. 7.72PCh. 7 - The normal pressure acting on the disk of the...Ch. 7 - Prob. 7.74PCh. 7 - The single-plate clutch transmits the torque C...Ch. 7 - The clutch described in Prob. 7.75 is to transmit...Ch. 7 - The cone clutch transmits the torque C through a...Ch. 7 - The figure shows a steel bar being processed by a...Ch. 7 - The coefficient of rolling resistance between the...Ch. 7 - Prob. 7.80PCh. 7 - Calculate the horizontal force P required to push...Ch. 7 - The uniform pole BC of length L and weight W is...Ch. 7 - The homogeneous bar AB of weight W and length L is...Ch. 7 - Find the smallest angle for which the uniform...Ch. 7 - Prob. 7.85RPCh. 7 - Determine the largest angle for which the uniform...Ch. 7 - Can the uniform bar of weight W remain at rest in...Ch. 7 - The panel of weight W with its center of gravity...Ch. 7 - The woman is trying to move the crate of weight W...Ch. 7 - The screw of the clamp has a square thread of...Ch. 7 - Find the largest clockwise couple C that can be...Ch. 7 - The test specimen AB is placed in the grip of a...Ch. 7 - The coefficient of static friction between the...Ch. 7 - The uniform bars AB and BC are connected with a...
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