A spherical galaxy, like M87, which looks like a monster globular cluster, is type
A) ES. B) 0V. C) ES1. D) S0. E) E0.
E
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"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars
Electromagnetic induction occurs in a coil when there is a change in
A) electric field intensity in the coil. B) magnetic field intensity in the coil. C) electromagnetic polarity. D) none of the above
What is the resistance of a 0.100-kW light bulb designed to be used in a 120-V circuit dc?
A) 12.0 ? B) 144 ? C) 0.83 ? D) 1.2 ?
Observer A is 3.0 m from a tiny light bulb and observer B is 12.0 m from the same bulb. Assume that the light spreads out uniformly and undergoes no significant reflections or absorption
If observer B sees a light of intensity I, the light intensity that A sees is A) I. B) 9I. C) 16I. D) 36I. E) 144I.