The magnetic domains in a magnetized piece of iron are characterized by which orientation?
a. anti-parallel (opposite direction) to the magnetic axis
b. perpendicular to the magnetic axis
c. parallel to the magnetic axis
d. random
C
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Which of the following would increase the gravitational force between two objects?
A) Moving the two objects closer together. B) Moving the two objects farther apart. C) Reducing the mass of either one of the objects. D) None of these.
Four 12
resistors are connected together. What is the least resistance that can be attained with these resistors?
A. 12 
B. 6.0
C. 3.0
D. 2.0
E. 1.0
When uranium fissions, the fission fragments are
A) each about half the mass of the uranium nucleus. B) about 2/5 and 3/5 the mass of the uranium nucleus. C) about 1/3 and 2/3 the mass of the uranium nucleus. D) about 1/4 and 3/4 the mass of the uranium nucleus. E) about 1/5 and 4/5 the mass of the uranium nucleus.
When a four-megaton nuclear bomb is exploded, approximately 18 × 10^15 J of energy is released. How much mass would this represent in a mass-to-energy conversion? (c = 3.00 × 10^8 m/s)
a. 0.20 kg c. 1.8× 103 kg b. 18 kg d. 0.050 kg