Why do prominences appear pink during a solar eclipse?
a. Because of the high temperature of the gases
b. Because the photosphere being blocked out
c. Because of the placement of the lunar disk over the Sun
d. Because the prominences interact with Earth's magnetic field
e. Because different gases are being combined in the chromosphere
a
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An inductor produces a back emf in a DC series RL circuit when a switch connecting the battery to the circuit is closed. We can explain this by
A. Lenz's law. B. increasing magnetic flux within the coils of the inductor. C. increasing current in the coils of the inductor. D. all of the above. E. only (a) and (c) above.
One of the most efficient engines built so far has the following characteristics: combustion chamber temperature = 1900°C; exhaust temperature = 430°C. 7.0 × 109 cal of fuel produces 1.4 × 1010 J of work in one hour
What is the power output, in hp, of this engine?
Which of the following is the best answer to the question, "Why does the Sun shine?"
A) The Sun initially began making energy through chemical reactions. These heated the interior enough to allow gravitational contraction and nuclear fusion to occur. B) The Sun initially began generating energy through nuclear fusion as it formed, but today it generates energy primarily through the sunspot cycle. C) As the Sun was forming, nuclear fusion reactions in the shrinking clouds of gas slowly became stronger and stronger, until the Sun reached its current luminosity. D) As the Sun was forming, gravitational contraction increased the Sun's temperature until the core became hot enough for nuclear fusion, which ever since has generated the heat that makes the Sun shine.
The distance between two successive ‘like' points on a wave is the wave's __________
Fill in the blank(s) with correct word