Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
6th Edition
ISBN: 9780134441184
Author: Robert L. Mott, Edward M. Vavrek, Jyhwen Wang
Publisher: PEARSON
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Textbook Question
Chapter 1, Problem 3P
For the devices described in Problems1−14, write a set of functions and design requirements in a similar manner to those in Section1−4. You or your instructor may add more specific information to the general descriptions given.
3. A portable crane to be used in small garages and homes.
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Questions 10 through 12 pertain to the situation described below:
A hydraulic brake system is shown in the figure below. The radius of the input piston is
1.20 cm and the radius of the output plungers is 3.40 cm. The lengths associated with the
lever arms of the brake pedal are L1
delivered by each output plunger in the given situation is 273 N with the force applied by the
foot being Fa.
:4.70 cm and L2
13.0 cm. Assume that the force
Fa
(10) What is the gauge pressure inside the brake fluid?
(A) 69.2 kPa; (B) 72.2 kPa; (C) 75.2 kPa; (D) 78.2 kPa; (E) 81.2 kPa.
(11) What is the torque (magnitude) produced by F,?
(A) 1.60 m N; (B) 1.80 m N; (C) 2.00 m N; (D) 2.20 m N; (E) 2.40 m N.
(12) What is the value of F?
(A) 7.53 N; (B) 8.03 N; (C) 8.53 N; (D) 9.03 N; (E) 9.53 N.
Procedure:
1. Copy the following table on a separate sheet of paper.
2. List all knowns
3. List all unknowns
4. List all equations that you need to use
5. Draw a diagram of the problem
6. Substitute and solve the problem. Be sure to show your work (1pt).
7. Final Answer
8. Take a picture and upload your answer!
Problem:
A 25 ft long solid steel rod is subjected to a load of 10,000 lb. This load causes the rod to stretch
0.477 in. The modulus of elasticity of the steel is 30,000,000 psi. Determine the diameter of the rod.
(precision of 0.00)
Table:
#1
Substitute and Solve:
Knowns:
Draw:
Unknowns:
Equation:
Final Solution
The Dubuque Cement Company packs 80-pound bags of concrete mix. Time-study data for the filling activity are shown in the
following table. Because of the high physical demands of the job, the company's policy is a 23% allowance for workers. (Round
all intermediate calculations to two decimal places before proceeding with further calculations.)
Element
Grasp and place bag
Fill bag
Seal bag
Place bag on conveyor
Performance
Rating
115%
80%
105%
95%
*Bag breaks open; included as delay in the allowance factor
^ Conveyor jams; included as delay in the allowance factor
a) The standard time for this process =
1
8
36
16
8
Observation (seconds)
2
9
40
16
6
3
8
38
13
9
seconds (round your response to two decimal places).
4
12
36
21
31A
5
6
114
18
34^
Chapter 1 Solutions
Machine Elements in Mechanical Design (6th Edition) (What's New in Trades & Technology)
Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...
Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For the devices described in Problems114, write a...Ch. 1 - For Problems 1528, perform the indicated...Ch. 1 - For Problems 1528, perform the indicated...Ch. 1 - For Problems 1528, perform the indicated...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...Ch. 1 - For Problems1528, perform the indicated conversion...
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