DESIGN OF MACHINERY
6th Edition
ISBN: 9781260113310
Author: Norton
Publisher: RENT MCG
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Chapter 2, Problem 2.51P
Find the mobility of the
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For the structure below, each member of the
truss will safely support a tensile force of 3 kN
and a compressive force of 1 kN. Determine
the largest mass m that can be safely
suspended. Hint: First work through this
algebraically to find the forces in each member
terms of the mass "m" to determine the largest
stress member.
1 m
t
1 m
1 m
1m + 1m
E
B
1977
m
Block A has a mass of 34 kg and block B has a mass of 41 kg.
The two blocks are stacked on the ramp with an incline of
Ꮎ
0 = 15.4°. Determine the largest horizontal force F that can
be applied to block B without either block moving for each of
the following two cases:
a.) The friction coefficient for the contact between blocks A
and B is μs1 0.56 and the friction coefficient for the
=
contact between block A and the ramp is μs2 = 0.34.
b.) The friction coefficient for the contact between blocks A
and B is 1 = 0.56 and the friction coefficient for the
contact between block A and the ramp is μs2 = 0.17.
Ꮎ
F
B
A
Part a)
The limiting slip condition occurs at
Select an answer
CC
BY NC SA
2016 Eric Davishahl
The maximum force before either block A or B slips is
N
Part b)
The limiting slip condition occurs at
Select an answer
The maximum force before either block A or B slips is
N
The crane truck has a weight of 11000 lb and a center of
gravity at point . The parking brake only locks the rear
wheels of the truck, so the front wheels are free to rotate.
Determine the maximum force F applied at the angle
=
0 30.5° that can be exerted on the crane without it
slipping or tipping for each of the following cases:
Case 1: The static friction coefficient between the rear tires
and the ground is μ. = 0.050.
ა
Case 2: The static friction coefficient between the rear tires
and the ground is
μα
==
0.33.
d
CGD
口
BY NC SA
F
2013 Michael Swanbom
кажо
с
Values for dimensions on the figure are given in the following
table. Note the figure may not be to scale.
Variable Value
a
5.5 ft
b
9 ft
C
4 ft
3 ft
10 ft
d
h
For Case 1, the constraint is Select an answer
F
=
lbs.
шал
For Case 2, the constraint is Select an answer
F
пал
lbs.
and
and
Chapter 2 Solutions
DESIGN OF MACHINERY
Ch. 2 - Find three (or other number as assigned) of the...Ch. 2 - How many DOF do you have in your wrist and hand...Ch. 2 - How many DOF do the following joints have? Your...Ch. 2 - How many DOF do the following have in their normal...Ch. 2 - Are the joints in Problem 2-3 force closed or form...Ch. 2 - Describe the motion of the following items as pure...Ch. 2 - Calculate the mobility of the linkages assigned...Ch. 2 - Identify the items in Figure P2-1 as mechanisms,...Ch. 2 - Use linkage transformation on the linkage of...Ch. 2 - Prob. 2.10P
Ch. 2 - Use number synthesis to find all the possible link...Ch. 2 - Prob. 2.12PCh. 2 - Use linkage transformation to create a 1-DOF...Ch. 2 - Use linkage transformation to create a 1-DOF...Ch. 2 - Calculate the Grashof condition of the fourbar...Ch. 2 - Prob. 2.16PCh. 2 - Describe the difference between a cam-follower...Ch. 2 - Examine an automobile hood hinge mechanism of the...Ch. 2 - Find an adjustable arm desk lamp of the type shown...Ch. 2 - The torque-speed curve for a 1/8 hp permanent...Ch. 2 - Find the mobility of the mechanisms in Figure...Ch. 2 - Find the Grashof condition and Barker...Ch. 2 - Find the rotatability of each loop of the...Ch. 2 - Find the mobility of the mechanisms in Figure...Ch. 2 - Find the mobility of the ice tongs in Figure P2-6:...Ch. 2 - Prob. 2.26PCh. 2 - Prob. 2.27PCh. 2 - Find the mobility of the corkscrew in Figure P2-9.Ch. 2 - Figure P2-10 shows Watts sun and planet drive that...Ch. 2 - Figure P2-11 shows a bicycle handbrake lever...Ch. 2 - Figure P2-12 shows a bicycle brake caliper...Ch. 2 - Find the mobility, the Grashof condition, and the...Ch. 2 - The approximate torque-speed curve and its...Ch. 2 - Prob. 2.34PCh. 2 - Prob. 2.35PCh. 2 - Sketch the equivalent linkage for the cam and...Ch. 2 - Describe the motion of the following rides,...Ch. 2 - For the mechanism in Figure P2-1 a, number the...Ch. 2 - Repeat Problem 2-38 for Figure P2-1b.Ch. 2 - Repeat Problem 2-38 for Figure P2-1c.Ch. 2 - Prob. 2.41PCh. 2 - Find the mobility, the Grashof condition, and the...Ch. 2 - Find the mobility, the Grashof condition, and the...Ch. 2 - Figure P2-20 shows a Rube Goldberg mechanism that...Ch. 2 - All the eightbar linkages in Figure 2-11 part 2...Ch. 2 - Prob. 2.46PCh. 2 - Prob. 2.47PCh. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Find the mobility of the mechanism shown in Figure...Ch. 2 - Prob. 2.52PCh. 2 - Prob. 2.53PCh. 2 - Repeat Problem 2-38 for Figure P2-1f.Ch. 2 - Repeat Problem 2-38 for Figure P2-1g.Ch. 2 - For the example linkage shown in Figure 2-4 find...Ch. 2 - For the linkage shown in Figure 2-5b find the...Ch. 2 - Prob. 2.58PCh. 2 - Figure P2-21b shows a mechanism. Find its mobility...Ch. 2 - Prob. 2.60PCh. 2 - Figure P2-21 d shows a log transporter. Draw a...Ch. 2 - Figure P2-21e shows a plow mechanism attached to a...Ch. 2 - Figure P2-22 shows a Hart inversor sixbar linkage....Ch. 2 - Figure P2-23 shows the top view of the partially...Ch. 2 - Figure P2-24a shows the seat and seat-back of a...Ch. 2 - Figure P2-24b shows the mechanism used to extend...Ch. 2 - Figure P2-24b shows the mechanism used to extend...Ch. 2 - Figure P2-25 shows a sixbar linkage. Is it a Watt...Ch. 2 - Use number synthesis o find all the possible link...Ch. 2 - Use number synthesis to find all the possible link...Ch. 2 - Prob. 2.71PCh. 2 - For the mechanism in Figure P2-26, number the...Ch. 2 - Figure P2-27 shows a schematic of an exercise...Ch. 2 - Calculate the mobility of the linkage in Figure...Ch. 2 - Calculate the Grashof condition of the fourbar...Ch. 2 - The drum brake mechanism in Figure P2-4g is a...
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