A star approaching Earth will show spectral lines that are shifted to longer wavelengths.
Answer the following statement true (T) or false (F)
False
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At the time the hypothesis was suggested, what major problem was identified with the idea that the Sun was powered by gravitational contraction?
A) This process would power the Sun for only about 25 million years, but geologists already had evidence the Earth was much older than that. B) This process could not possibly lead to the observed power output of the Sun. C) 19th century astronomers should have been able to measure the required change in the Sun's size. D) Contracting objects cool down rather than heat up.
One long wire carries a current of 30 A along the entire x axis. A second long wire carries a current of 40 A perpendicular to the xy plane and passes through the point (0, 4, 0) m. What is the magnitude of the resulting magnetic field at the point y = 2.0 m on the y axis?
a. 4.0 ?T b. 5.0 ?T c. 3.0 ?T d. 7.0 ?T e. 1.0 ?T
Brief increases in atmospheric sulfur in Venus's atmosphere may be due to
A. chemical reactions between sulfuric acid clouds and the surface. B. cloud-to-cloud lightning in Venus's atmosphere. C. a large meteor entering Venus's atmosphere. D. a volcanic eruption on Venus's surface.
If the intensity level by 15 identical engines in a garage is 100 dB, what is the intensity level generated by each one of these engines?
A) 67 dB B) 13 dB C) 44 dB D) 88 dB