A 3.00-kg ball has zero potential and kinetic energy. Maria drops the ball into a 10.0-m-deep well. After the ball comes to a stop in the mud, the sum of its potential and kinetic energy is:
a. zero.
b. 294 J.
c. ?294 J.
d. 588 J.
e. ?588 J.
c
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A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true?
A) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus. B) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is greater than the force exerted on the carbon nucleus. C) The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is less than the force exerted on the carbon nucleus. D) The electrical force experienced by the hydrogen nucleus is to the right, and the magnitude is equal to the force exerted on the carbon nucleus.
Which of the following statements best describes a relatively polar bond?
A) a very electronegative atom and a weakly electronegative atom are covalently bound B) two very electronegative atoms are covalently bound C) two very electronegative atoms undergo ionic bonding D) two weakly electronegative atoms undergo ionic bonding E) none of the above
In the Drude model of electrical conduction, the current density is NOT directly proportional to
a. the average time interval between successive collisions. b. the number of charge carriers per unit volume. c. the square of the electron charge. d. the electric field present in the wire. e. the resistivity of the wire.
If the Moon were covered with water, tidal effects caused by Earth would find the Moon with
A) 1 tidal bulge. B) 2 tidal bulges. C) 3 tidal bulges. D) 4 tidal bulges. E) no tidal bulges.