Electric Motors and Control Systems
2nd Edition
ISBN: 9780073373812
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 1.1, Problem 10RQ
List three pieces of personal protection equipmentrequired to be worn on most job sites.
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Problem4.
The thin uniform disk of mass m = 1-kg and radius R = 0.1m spins about the bent shaft OG with
the angular speed w2 = 20 rad/s. At the same time, the shaft rotates about the z-axis with the angular
speed 001 = 10 rad/s. The angle between the bent portion of the shaft and the z-axis is ẞ = 35°. The
mass of the shaft is negligible compared to the mass of the disk.
a. Find the angular momentum of the disk with respect to point G, based on the axis
orientation as shown. Include an MVD in your solution.
b. Find the angular momentum of the disk with respect to point O, based on the axis
orientation as shown. (Note: O is NOT the center of fixed-point rotation.)
c. Find the kinetic energy of the assembly.
z
R
R
002
2R
x
Answer: H = -0.046ĵ-0.040 kg-m²/sec
Ho=-0.146-0.015 kg-m²/sec
T 0.518 N-m
=
Problem 3.
The assembly shown consists of a solid sphere of mass m and the uniform slender rod of the same
mass, both of which are welded to the shaft. The assembly is rotating with angular velocity w at a
particular moment. Find the angular momentum with respect to point O, in terms of the axes
shown.
Answer: Ñ。 = ½mc²wcosßsinßĵ + (}{mr²w + 2mb²w + ½ mc²wcos²ß) k
3
m
r
b
2
C
لا
m
Only question 2
Chapter 1 Solutions
Electric Motors and Control Systems
Ch. 1.1 - Does the severity of an electric shock increase...Ch. 1.1 - a. Calculate the theoretical body current flow...Ch. 1.1 - Normally a 6 volt lantern battery capable of...Ch. 1.1 - Prob. 4RQCh. 1.1 - What circuit fault can result in an arc flash?Ch. 1.1 - Defineeach of the following terms associated...Ch. 1.1 - Explain why an arc flash is so potentially...Ch. 1.1 - State the piece of electrical safety equipment...Ch. 1.1 - Outline the safety procedure to follow when you...Ch. 1.1 - List three pieces of personal protection...
Ch. 1.2 - Prob. 1RQCh. 1.2 - Prob. 2RQCh. 1.2 - Prob. 3RQCh. 1.2 - List the seven steps involved in a...Ch. 1.2 - Prob. 5RQCh. 1.2 - Prob. 6RQCh. 1.2 - How are the standards contained in the...Ch. 1.2 - Explain the difference between a Code Article and...Ch. 1.2 - Prob. 9RQCh. 1.2 - Prob. 10RQCh. 1.2 - Prob. 11RQCh. 1.2 - Prob. 12RQCh. 1.2 - The voltage between the frame of a 3-phase 208...Ch. 1.2 - Prob. 2TCh. 1.2 - Prob. 3TCh. 1.2 - A hot stick is to be used to open a...Ch. 1.2 - An employee is contemplating using his lockoutlock...Ch. 1.2 - Prob. 1DTCh. 1.2 - Prob. 2DTCh. 1.2 - Why can birds safely rest on high-voltage...
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