A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between the points x = 4.0 m and y = 2.0 m because of this charge?
A) -9.0 × 103 V
B) 9.0 × 103 V
C) -36 × 103 V
D) 36 × 103 V
E) 0 V
A
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Background radiation from cosmic rays and radioactive nuclei in our surroundings is about 0.13 rem/year. Suppose we assume this all comes from cosmic rays which have an RBE factor of 1.0 . The RBE factor for the most dangerous types of radiation is 20 . How many rads of the most dangerous radiation could a 100-year-old person have been exposed to in her lifetime without having gone over the
recommended limit of 0.5 rem/year? a. 0.37 b. 0.50 c. 1.85 d. 13 e. 37
Strange as it may seem, it is just as difficult to accelerate a car on a level surface on the Moon as it is here on Earth because
A) the mass of the car is independent of gravity. B) the weight of the car is independent of gravity. C) both of these D) neither of these
If the same-sized force is made to act over a smaller area, the pressure is
a. decreased. b. increased. c. unchanged. d. dependent upon the shape of the area.
A muon detector on Mount Washington observes greater numbers of muons than an identical detector located at a lower elevation, for example in Boston. The number detected in Boston, however, is much greater than the number predicted when considering the elevation separation between Boston and Mount Washington, the muons' speed, and the time of the muons' half-life. Why is this so?