Why are different spectral lines, such as helium, more visible in the corona than in the Sun's normal absorption spectrum?
What will be an ideal response?
The corona is much hotter, and can ionize helium, which the photosphere is too cool to do.
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The _________material in a composite is continuous and surrounds the reinforcing phase of particles or fibers.
Fill in the blank(s) with the appropriate word(s).
Red and orange stars are found evenly spread throughout the galactic disk, but blue stars are typically found
A) only in or near star-forming clouds. B) in the halo. C) only in the central bulge. D) also evenly spread throughout the galactic disk.
When people get into a small boat it settles lower in the water and
a. the buoyant force increases as a result of more water being displaced. b. the net force on the boat again becomes zero. c. the pressure on the bottom of the boat becomes greater because it is deeper in the water. d. all of the above.
A 50 kg ice skater moving at 6 m/s collides with a second stationary skater with mass 70 kg. The skaters cling together after the collision and move without friction. Compute their speed after the collision