The half-life of a muon is 2.2 ms. How fast is it moving relative to an observer who says its half-life is 4.4 ms?
a. 0.87 c
b. 0.75 c
c. 0.97 c
d. 0.72 c
e. 0.50 c
A
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Which of the following statements is true of a bipolar flow?
A) It represents jets flowing in opposite directions away from a central object. B) It is similar to that of laminar and transient flows. C) It is not associated with Herbig-Haro objects. D) It is not associated with the asymptotic giant branch stars.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If two collinear vectors 
and 
are added, the resultant has a magnitude equal to 4.0. If is subtracted from , the resultant has a magnitude equal to 8.0. What is the magnitude of ?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
E. 6.0
The beginning of the Paleozoic is marked by the emergence of
A) organisms with hard parts. B) fish and fungi. C) extensive glaciated deposits. D) none of these
Astronomers sometimes make use of "neutrino telescopes," which are typically located deep underground. What are neutrinos?
A) a type of light-weight subatomic particle B) a very high-energy form of light C) a very low-energy form of light D) a type of wave predicted to exist by Einstein's general theory of relativity