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.
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
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