Why does Earth have the strongest magnetic field among the terrestrial worlds?
A) It is the only one that has a metallic core.
B) It rotates much faster than any other terrestrial world.
C) It is the only one that has both a convecting core region and reasonably rapid rotation.
D) It is by far the largest terrestrial world.
E) It is the most volcanically active world.
C) It is the only one that has both a convecting core region and reasonably rapid rotation.
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A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.75 s. How high is the cliff?
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How does the speed (in a vacuum) of a high-frequency electromagnetic wave compare with a low-frequency electromagnetic wave?
A) the lower-frequency wave has the higher speed because speed is inversely related to frequency B) the two waves have the same speed because the speed of light is constant C) the lower-frequency wave has the higher speed because it has the longest wavelength D) the higher-frequency wave has the higher speed
How do we know that there are intergalactic clouds between a distant quasar and us?
A) We see hydrogen emission lines at redshifts smaller than that of the quasar. B) We see hydrogen absorption lines at redshifts smaller than that of the quasar. C) We see hydrogen emission lines at redshifts greater than that of the quasar. D) We see hydrogen absorption lines at redshifts greater than that of the quasar. E) We see that the emission lines from the quasar are lessened by intervening gas and dust.
An AC generator consists of 6 turns of wire. Each turn has an area of 0.040 m2 . The loop rotates in a uniform field (B = 0.20 T) at a constant frequency of 50 Hz. What is the maximum induced emf?
a. 13 V b. 2.4 V c. 3.0 V d. 15 V e. 4.8 V