The horizontal surface on which the objects slide is frictionless. If F = 12 N, what is the tension in string 1?
A. 35 N
B. 30 N
C. 40 N
D. 45 N
E. 25 N
Answer: B
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When we look at the farthest galaxies in the Hubble Ultra Deep Field we can see their light from:
A.) About 12 or 13 billion years ago. B.) About 4.5 billion years ago. C.) About 1 or 2 billion years ago. D.) About 4 million years ago.
Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
?
Exhibit 3-3
The vectors 
and 
are shown below.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 3-3. Which diagram below correctly represents 
?
A.
B.
C.
D.
E.
The first-quarter Moon sets at approximately
a. midnight. b. noon. c. 6 P.M. d. 6 A.M.
How can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with?
a. The electron doesn't come from the nucleus—it comes from an orbit circling the nucleus. b. A neutron in the nucleus turns into a proton, electron, and a neutrino. c. A proton in the nucleus turns into a neutron, electron, and a neutrino. d. none of the above