The voltage across the input terminals of a transformer is 110 V. The primary coil has 50 loops and the secondary has 25 loops. The output is
A) 25 V.
B) 55 V.
C) 110 V.
D) 220 V.
E) none of the above
Answer: B
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When Jim and Rob ride bicycles, Jim can only accelerate at three quarters the acceleration of Rob. Both start from rest at the bottom of a long straight road with constant upward slope. If Rob takes 5.0 minutes to reach the top, how much earlier should Jim start to reach the top at the same time as Rob?
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Saturn's rings are
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About what temperature does the CMB have at this time?
A. 30 million K B. 3,000 K C. 3 trillion K D. 3 K E. 3 billion K