If the corona is so hot, why must we wait for a total solar eclipse to glimpse it?
What will be an ideal response?
It is so hot that almost all the energy it gives off, by Wien's Law, is not going to be in the visible, but the X-ray portion of the spectrum. Also, it is very low density, so there are far more atoms at 5,800 K giving off a lot of visible light than the few out in the corona.
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A torque of 15.0 N•m is applied to a bolt. The bolt rotates through an angle of 360 degrees. The work done in turning the bolt is
A. 94.2 J. B. 91.3 J. C. 96.7 J. D. 89.9 J. E. 98.1 J.
A person approaches a plane mirror at a speed of 2 m/s. How fast does he approach his image?
A) 1 m/s B) 2 m/s C) 3 m/s D) 4 m/s E) 1 m/s
Which of the following properties can be inferred from the star’s orbital period?
a. the planet’s orbital radius b. the planet’s mass c. both the planet’s orbital radius and it's mass d. neither the planet’s orbital radius nor it's mass
What distance method is used to determine the distance to the most distant galaxies?
a. Radar echo b. Supernova observations c. Period-luminosity relationship of variable stars d. Parallax