Place an iron rod inside a current-carrying coil of wire and you
A) increase the strength of the electromagnet.
B) have a superconducting magnet.
C) a magplane in the making.
Answer: A
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Hydrogen lines are weak in the spectra of hot stars because many of the hydrogen atoms have their electrons in levels above the second level
a. True b. False Indicate whether the statement is true or false
Time Dilation: Someone in Earth's rest frame says that a spaceship's trip between two planets took 10.0 y, while an astronaut on the space ship says that the trip took 5.78 y. What is the speed of the spaceship, assuming the planets are at essentially at rest?
A. 0.816 c B. 0.735 c C. 0.975 c D. 0.384 c
An X-ray telescope placed on the surface of Earth can detect X-rays that are emitted from a distant astrophysical source.
Answer the following statement true (T) or false (F)
Which of the following techniques is not useful for determining the age of the universe?