Author Question: When observing an object, such as a space ship that is moving very quickly relative to you, the ... (Read 93 times)

bb · **on:** Jul 27, 2018

When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be

A) longer than when they are at rest.
B) the same length as when they are at rest.
C) shorter than when they are at rest.
D) narrower than when they are at rest.
E) wider than when they are at rest.

Question 2

Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into a disk?

A) They are light enough that they have expanded out into the halo.
B) WIMPs were produced at the early stages of galaxy evolution, and objects in the halo, such as globular clusters, were formed at the beginning of the galaxy.
C) Since they do not interact with the electromagnetic force, they do not feel friction or drag and hence do not contract with the rest of the protogalactic cloud.
D) Shock waves from supernovae have blown the WIMPs out into the halo.
E) Jets from the early active stage of a galaxy's life shot out most of the WIMPs from the disk.