MAT. SCI. & ENG: AN INTO. WILEYPLUS
MAT. SCI. & ENG: AN INTO. WILEYPLUS
10th Edition
ISBN: 9781119472001
Author: Callister
Publisher: WILEY
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Chapter 21, Problem 23QAP

(a)

To determine

To describe:

The phenomenon of luminescence:

(b)

To determine

The difference between fluorescence and phosphorescence:

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Please draw logic circuit
A 220-volt, 20-horsepower compound motor (long shunt, Figure 21–16A) has an armature resistance of 0.25 ohm, series field resistance of 0.19 ohm, and shunt field resistance of 33 ohms.    a.     Calculate the current taken by the motor at the instant of starting if it is con-nected directly to the 220-volt line.  b.    Calculate the current when the motor is running if the armature is developing 184 volts counter-emf.
For the position shown in the figure the spring is unstretched. The spring constant k, is designed such that after the system is released from rest, the speed of the mass is zero just as the 0.6 slug mass touches the floor. Find the spring constant, k and the maximum speed of block A and the location (distance above floor) where this occurs.
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