Suppose that you wish to construct a simple ac generator having an output of 12 V maximum when rotated at 60 Hz. A uniform magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns do you need?
A) 8
B) 16
C) 32
D) 64
E) 128
Answer: D
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Length Contraction: A starship is constructed to be 100 m long in the factory. It is launched and as it coasts by Earth, it is measured to be shortened to 5.48 m long.(a) How fast, in terms of the speed of light, is it moving past Earth?(b) What length does the ship's crew measure for the ship?
What will be an ideal response?
By what amount does the intensity level increase when you triple the intensity of a source of sound?
A) 9.5 dB B) 4.8 dB C) 6.0 dB D) 3.0 dB E) 12 dB
It takes 200 golf balls to equal the mass of four bowling balls, what is the relative mass of bowling balls to golf balls?
A) 1/50 B) 1/20 C) 20 times D) 100 times E) 6.022 × 1023
As the moon covers the solar disk during a solar eclipse, a flash spectrum of the sun's chromosphere can be recorded. This flash spectrum reveals an emission spectrum and provides information on the properties of the chromosphere. As the moon moves from the inner chromosphere to the outer chromosphere, the spectral lines present in the flash spectrum change. What is going on in the chromosphere
that produces the changes in the flash spectrum? I. The temperature of the chromosphere decreases as the distance from the photosphere increases. II. The temperature of the chromosphere increases as the distance from the photosphere increases. III. The density of the chromosphere decreases as the distance from the photosphere increases. IV. The density of the chromosphere increases as the distance from the photosphere increases. a. I & III b. I & IV c. II & III d. II & IV e. I