There are many types of galaxies, but the most massive galaxies are going to be....
A. lenticular.
B. barred spirals.
C. irregulars.
D. ellipticals.
Answer: D. ellipticals.
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Compared to the entire electromagnetic spectrum, visible light is ________.
A. the least energetic B. the most energetic C. a small fraction of the possible wavelengths of light D. the most valuable to astronomers E. the fastest moving
A flat coil of wire consisting of 20 turns, each with an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ?, what is the magnitude of the induced current?
a. 0.70 A b. 0.60 A c. 0.50 A d. 0.80 A e. 0.20 A
What type of lens is used in a pinhole camera?
A. Converging B. Diverging C. Spherical D. No lens is used
In the figure, if a = 2.0 cm, b = 4.0 cm, and I = 2.0 A, what is the magnitude of the magnetic field at point P?
A. 49 ?T B. 39 ?T C. 50 ?T D. 69 ?T E. 13 ?T