Exhibit 17-1
The figure below shows a sine wave at one point of a string as a function of time.
?
?
Use the exhibit to answer the following question(s).
Refer to Exhibit 17-1. Which of the graphs below shows a wave where the amplitude and frequency are each reduced in half?
A.
B.
C.
D.
E.
Answer: E
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A DC motor of internal resistance 6.0 ? is connected to a 24-V power supply. The operating current is 1.0 A
(a) What is the start-up current? (b) What is the back emf when the motor is running at full speed? (c) What is the back emf when the motor is running at half speed?
Suppose you live on the near side of the Moon in the crater Copernicus. How often will the Sun set below your horizon?
a. Every 12 hours b. Every 24 hours c. Every 29.5 days d. Never
A series of n uncharged concentric shells surround a small central charge q. The charge distributed on the outside of the nth shell is
a. ?nq. b. ?(ln n)q. c. +q. d. +(ln n)q. e. +nq.
Which answer is incorrect? A base is a substance that, when dissolved in water,
a. reacts with an acid to neutralize its properties. b. reacts with many metals to liberate O2. c. changes the color of litmus dye from red to blue. d. conducts electricity.