Why do we think that the solar system formed from a rotating, collapsing gas cloud that ended up as a disk orbiting the Sun?
a. Most of the planets revolve and rotate in the same direction and in the same plane.
b. We see clouds of gas and dust in space with apparently young stars in them.
c. We see disks around young stars.
d. All of the above.
Ans: d. All of the above.
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In a relay race, runner A is carrying the baton and has a speed of 3.00 m/s. When he is 25.0 m behind the starting line, runner B starts from rest and accelerates at 0.100 m/s2
How long afterwards will A catch up with B to pass the baton to B? A) 5.17 s B) 10.0 s C) 11.9 s D) 20.4 s E) A never catches up.
When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. According to special relativity, this pair production is an example of __________
Fill in the blank(s) with correct word
____ is (are) produced by atomic transitions in the presence of a strong magnetic field
a. Differential rotation b. Granules c. The Zeeman effect d. Spicules e. The coronal hole
Recall that Hubble's law is written v = H0d, where v is the recession velocity of a galaxy located a distance d away from us, and H0 is Hubble's constant. Suppose H0 = 55 km/s/Mpc
How fast would a galaxy located 500 megaparsecs distant be receding from us? Show all work clearly, and state your final answer with a complete sentence. Give the speed in units of kilometers per second and as a percentage of the speed of light.