General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
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Chapter 19, Problem 37E
To determine
The net force on the loop shown in Figure 19.38.
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Please help with 32
31 The commutator of a 1.5 hp, 2-pole, 3000
r/min de motor has a diameter of 63 mm.
Calculate the peripheral speed in feet per
minute and in miles per hour.
32 The following information is given on the
brushes used in the motor of Problem 31:
number of brushes: 2
current per brush: 15 A
brush dimensions: 5/8 in wide, 5/16 in thick,
3/4 in long. (The 5/16 in × 5/8 in area is in
contact with the commutator.)
resistivity of brush: 0.0016 Q
brush pressure: 1.5 Ibf
brush contact drop: 1.2 V
coefficient of friction: 0.2
Calculate the following:
a. The resistance of the brush body in ohms
b. The voltage drop in the brush body
c. The total voltage drop in one brush, including
the contact voltage drop
d. The total electrical power loss (in watts) due to
the two brushes
e. The frictional force of one brush rubbing
against the commutator surface (in Ibf and in
newtons)
f. The frictional energy expended by the two
brushes when the commutator makes one
revolution (in joules)
g.…
Transform the Wwye network to Delta network
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19) By using the Kirchoff Laws, determine the loop currents i to is in the electrical network
shown by any suitable mathmatical method.
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+120 V
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Chapter 19 Solutions
General Physics, 2nd Edition
Ch. 19 - Prob. 1RQCh. 19 - Prob. 2RQCh. 19 - Prob. 3RQCh. 19 - Prob. 4RQCh. 19 - Prob. 5RQCh. 19 - Prob. 6RQCh. 19 - Prob. 7RQCh. 19 - Prob. 8RQCh. 19 - Prob. 9RQCh. 19 - Prob. 10RQ
Ch. 19 - Prob. 1ECh. 19 - Prob. 2ECh. 19 - Prob. 3ECh. 19 - Prob. 4ECh. 19 - Prob. 5ECh. 19 - Prob. 6ECh. 19 - Prob. 7ECh. 19 - Prob. 8ECh. 19 - Prob. 9ECh. 19 - Prob. 10ECh. 19 - Prob. 11ECh. 19 - Prob. 12ECh. 19 - Prob. 13ECh. 19 - Prob. 14ECh. 19 - Prob. 15ECh. 19 - Prob. 16ECh. 19 - Prob. 17ECh. 19 - Prob. 18ECh. 19 - Prob. 19ECh. 19 - Prob. 20ECh. 19 - Prob. 21ECh. 19 - Prob. 22ECh. 19 - Prob. 23ECh. 19 - Prob. 24ECh. 19 - Prob. 25ECh. 19 - Prob. 26ECh. 19 - Prob. 27ECh. 19 - Prob. 28ECh. 19 - Prob. 29ECh. 19 - Prob. 30ECh. 19 - Prob. 31ECh. 19 - Prob. 32ECh. 19 - Prob. 33ECh. 19 - Prob. 34ECh. 19 - Prob. 35ECh. 19 - Prob. 36ECh. 19 - Prob. 37ECh. 19 - Prob. 38ECh. 19 - Prob. 39ECh. 19 - Prob. 40ECh. 19 - Prob. 41ECh. 19 - Prob. 42ECh. 19 - Prob. 43ECh. 19 - Prob. 44ECh. 19 - Prob. 45ECh. 19 - Prob. 46ECh. 19 - Prob. 47ECh. 19 - Prob. 48ECh. 19 - Prob. 49ECh. 19 - Prob. 50ECh. 19 - Prob. 51ECh. 19 - Prob. 52ECh. 19 - Prob. 53ECh. 19 - Prob. 54ECh. 19 - Prob. 55ECh. 19 - Prob. 56ECh. 19 - Prob. 57ECh. 19 - Prob. 58ECh. 19 - Prob. 59ECh. 19 - Prob. 60ECh. 19 - Prob. 61E
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