An element is distinct because of its number of
A) protons.
B) neutrons.
C) electrons.
D) the total mass of all the particles.
E) none of the above
Answer: A
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Potential Energy: A 7.0-?C point charge and a 9.0-?C point charge are initially extremely far apart. How much work does it take to bring the 7.0-?C point charge to the point x = 3.0 mm, y = 0.0 mm, and the 9.0-?C point charge to the point x = -3.0 mm, y = 0.0 mm? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 95 J B. 190 J C. 63 J D. 16 J
If you rub two transparency sheets with tissue and then hold the two transparency sheets at rest a short distance apart, they will then exert
A) a repulsive electric force on each other, but no magnetic force. B) a repulsive magnetic force on each other, but no electric force. C) an attractive electric force on each other, but no magnetic force. D) an attractive magnetic force on each other, but no electric force. E) no electric or magnetic forces on each other.
In a certain velocity selector consisting of perpendicular electric and magnetic fields, the charged particles move toward the east, and the magnetic field is directed to the north. What direction should the electric field point?
A) downward B) toward the west C) toward the south D) toward the east E) upward
If during a given physical process the only force acting on an object is friction, which of the following must be assumed in regard to the object's kinetic energy?
a. decreases c. remains constant b. increases d. cannot tell from the information given