The ratio of the universe's actual density to the critical density is:
A) ?critical.
B) ?/?.
C) ?o.
D) H/D.
E) 1/H.
C
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The idea in fission-bomb design is to
A) form a supercritical mass from one or more subcritical masses. B) bring neutrons and subcritical uranium together. C) both of these D) neither of these
The characteristic peaks in an x-ray spectrum of an atom occur because of rapid deceleration of the bombarding electrons
a. True b. False Indicate whether the statement is true or false
vx is the velocity of a particle moving along the x axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t = 6.0 s?
?
?
a.
?2.0 m
b.
+2.0 m
c.
+1.0 m
d.
?1.0 m
e.
6.0 m
Which of the following statements about electrical charge is true?
A) A positive charge and a negative charge will repel each other. B) Two positive charges will attract each other. C) Two negative charges will attract each other. D) A positive charge and a negative charge will attract each other.