EBK THINKING LIKE AN ENGINEER
4th Edition
ISBN: 8220103633512
Author: OHLAND
Publisher: PEARSON
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Textbook Question
Chapter 2, Problem 1RQ
- 1. Which statement about ethical codes is NOT true?
- A. Ethical codes have been around for thousands of years.
- B. Ethical codes exist at local and global levels.
- C. Ethical codes are often rooted in religious thought.
- D. Ethical codes prevent people from acting unethically.
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4. An impeller rotating at 1150 rpm has the following data: b, = 1 ¼ in., b2 = ¾ in., d, = 7 in., d2 =
15 in., B1 = 18", B2 = 20°, cross-sectional area A = Db if vane thickness is neglected. Assuming radial inlet flow, determine the theoretical
capacity in gpm
head in ft
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5. If the impeller in Problem (4) develops an actual head of 82 ft and delivers 850 gpm at the point of maximum efficiency and requires 22 BHP. Determine
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virtual velocities V2 and W2
(30 pts) Problem 1
A thin uniform rod of mass m and length 2r rests in a smooth hemispherical bowl of radius r. A
moment M
mgr
4
is applied to the rod. Assume that the bowl is fixed and its rim is in the
horizontal plane.
HINT: It will help you to find the length l of that portion of the rod that remains outside the
bowl.
M
2r
a) How many degrees of freedom does this system have?
b) Write an equation for the virtual work in terms of the angle 0 and the motion of the
center of mass (TF)
c) Derive an equation for the variation in the position of the center of mass (i.e., Sŕƒ)
a. HINT: Use the center of the bowl as the coordinate system origin for the problem.
d) In the case of no applied moment (i.e., M 0), derive an equation that can be used to
solve for the equilibrium angle of the rod. DO NOT solve the equation
e) In the case of an applied moment (i.e., M
=
mgr
= -) derive an equation that can be used to
4
solve for the equilibrium angle of the rod. DO NOT solve the equation.
f) Can…
Please show all work step by step
Chapter 2 Solutions
EBK THINKING LIKE AN ENGINEER
Ch. 2 - For each of the following situations, indicate...Ch. 2 - For each of the following situations, indicate...Ch. 2 - For each of the following situations, indicate...Ch. 2 - For each of the following situations, indicate how...Ch. 2 - 1. Which statement about ethical codes is NOT...Ch. 2 - Prob. 2RQCh. 2 - 3. When considering alternative solutions, the...Ch. 2 - 4. In the (fictitious) story of George Washington...Ch. 2 - 5. In a common ethical riddle, a person is forced...Ch. 2 - Prob. 6RQ
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