Seyfert galaxies____
a. often have unique shapes spectra suggesting fast-moving, hot gas
b. have no gas and dust in their spiral arms
c. are associated with pairs of radio sources
d. have visible jets of matter coming from their cores
e. are always isolated galaxies
a
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A current I = 3 sin (400 t) amperes flows in a series RL circuit in which L = 1 mH and R = 100 ?. What is the average power loss?
a. 225 W b. 450 W c. 980 W d. 1.12 kW e. 900 W
Most of the craters on the highlands of the Moon were formed
A) approximately 65 million years ago B) at the end of the Hadean eon approximately 3.85 billion years ago C) fairly recently during the last million years or so D) during the period of early bombardment constituting the first few hundred million years of the Earth's history
If you drop a coin inside a car that is turning a corner to the right, the coin will land
A) to the left of the drop point. B) in North Dakota. C) to the right of the drop point. D) right under the drop point. E) to the rear of the drop point.
Simple Pendulum: Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)
A. Raise the weight. B. Lower the weight. C. Add more mass to the weight. D. Remove some mass from the weight. E. Increase the amplitude of swing by a small amount.