Why are the halo stars distributed spherically instead of throughout the disk?
What will be an ideal response?
They formed early, while the protogalaxy was spinning slowly and was roughly spherical. Over time, rotation flattened most of the material into a disk and formed the Population I stars later.
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If the Earth's rotation axis were tilted by 45 degrees instead of 23.5 degrees, what are some of the implications, and why?
A) The seasons would be less extreme, because the Sun's rays would be less direct in summer, and more direct in winter. B) The seasons would be more extreme, because the surface of the Earth would be closer to the Sun in the summer, and farther from the Sun in the winter. C) The seasons would be less extreme, because the surface of the Earth would be farther from the Sun in the summer, and closer to the Sun in the winter. D) The seasons would be more extreme, because the Sun's rays would be more direct in summer, and less direct in winter.
In a Hall experiment a conducting strip of thickness d = 100 ?m is placed in a magnetic field B = 0.0 5 T. The magnetic field is perpendicular to the direction of the strip along which there is a 10-A current
What is the Hall voltage measured across the strip if the charge carrier density is 2.5 × 1028/m3 in this material? A) 1.3 ?V B) 2.5 ?V C) 0.72 ?V D) 6.2 ?V E) 4.2 ?V
A main-sequence star is observed with a surface temperature of 3500 K and a luminosity 10?2 times that of the Sun. Based on the H-R diagram shown above, what is the approximate mass of this star?
A) 0.2 times that of the Sun B) 0.5 times that of the Sun C) 0.9 times that of the Sun D) 1.5 times that of the Sun
We have observed a comet strike Jupiter
Indicate whether the statement is true or false