What observation made of other stars seems to suggest the solar nebula hypothesis is correct?
a. Stars are found to exist more often in binaries than by themselves.
b. Protostars are seen to radiate much of their light at infrared wavelengths.
c. Nearby stars tend to be low mass red dwarfs.
d. Young stars are found to have hot disks that surround them.
D
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Determine the shape factors between the three surfaces A1, A2, and A3 indicated in the figure.
Consider an object twice the size of Comet Tempel 1. What kind of damage would this object cause if it hit our planet?
A) mass extinction B) widespread devastation and climate change C) atmospheric explosion or a small crater
A cart starting from rest rolls down a hill and at the bottom has a speed of 4 m/s. If the cart were given an initial push, so its initial speed at the top of the hill was 3 m/s, what would be its speed at the bottom?
a) 4 m/s b) 5 m/s c) 6 m/s d) 7 m/s e) 25 m/s
Huygen's Principle only applies to
A. electromagnetic waves. B. water waves. C. sound waves. D. all of these choices are correct