Radiation dosages based on potential damage is in
A) rads.
B) rems.
C) joules.
D) none of the above
Answer: B
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Dimensional Analysis: The gravitational force of attraction F between two tiny masses m1 and m2 that are separated by a distance r is F = G 
. In the SI system, force has units of kg ? m/s2 . Use the given gravitational force formula to determine the SI units of G in terms of the fundamental quantities of mass, length, and time.
Fill in the blank(s) with the appropriate word(s).
The ________-year solar cycle is characterized by a variation in the number of sunspots and a reversal of the polarity of the Sun as a whole
Fill in the blank(s) with correct word
Photography Optics: The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person who is 25 m from the lens to one who is 4.0 m from the lens?
A. 0.2 mm B. 0.3 mm C. 0.4 mm D. 0.5 mm E. 0.7 mm
We are led to believe that there were two kinds of charge because we are able to
(A) isolate them in separate containers. (B) see two effects, attraction and repulsion. (C) detect different weights for the same object. (D) separate electrons and protons.