Power: What is the power factor of an RLC ac series circuit with an inductive reactance of 174 ?, a capacitive reactance of 60 ? and a resistance of 0.10 k??
A. 0.29
B. 0.46
C. 0.56
D. 0.66
E. 0.76
Answer: D
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The focal length of the objective of a telescope is 75.0 cm. While the eyepiece has a focal length of 6.00 cm, what is the magnifying power of this telescope?
A) 0.0800 B) 0.645 C) 450 D) 12.5 E) 200
Why does the Cepheid distance method fail us beyond about 20 Mpc?
A) The intergalactic dust reddens the Cepheid's light and apparent brightness. B) Distant galaxies are younger than our Milky Way; too young to have Cepheids yet. C) The periods of Cepheids grows longer as the distances increase. D) Distant galaxies are seen in the past, and Cepheids evolve with time. E) Even with the HST, the most luminous Cepheids are too faint to be seen beyond 20 Mpc.
A proton is circling the Earth above the magnetic equator, where Earth's magnetic field is directed horizontally north and has a magnitude of 4.00 × 10^–8 T. If the proton is moving at a speed of 2.7 × 10^7 m/s, how far above the surface of the Earth is the proton? Earth's radius is 6.38 × 10^6 m, a proton's mass is 1.67 × 10^–27 kg, and its charge is 1.6 × 10^–19 C
a. 7.05E+6 m b. 1.34E+7 m c. 1.03E+8 m d. 6.65E+5 m
In a neutral atom, the number of protons is equal to the number of ______________
Fill in the blank(s) with correct word