The magnetic dipole moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
A. r.
B. v.
C. vr.
D. evr.
E. mNvr.
Answer: D
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A point charge Q is placed on the x axis at x = 2.0 m. A second point charge, ?Q, is placed at x = 3.0 m. If Q = 40 ?C, what is the magnitude of the electrostatic force on a 30-?C charge placed at the origin?
A. 7.2 N B. 3.9 N C. 1.5 N D. 14 N E. 8.1 N
A puddle holds 160.0 g of water. If 0.5 g of water evaporates from the surface, what is the approximate temperature change of the remaining water? (Lv = 540 cal/g)
a. +1.7 C° b. ?1.7 C° c. +0.17 C° d. ?0.17 C°
A brass plate with a thickness of 1.00 cm is placed over a copper plate with a thickness of 2.00 cm. The coefficient of thermal conductivity of brass is 100 W/m 
and of copper is 400 W/m 
What is the effective coefficient of thermal conductivity for the brass-copper layer?
A. 150 W/m 
B. 200 W/m
C. 250 W/m
D. 300 W/m
E. 350 W/m
Over the course of a single night, stars move overhead due to ________.
A. the motion of the Sun around the galaxy B. their motion around Earth C. the tilt of Earth's axis D. the rotation of the celestial sphere E. the rotation of Earth on its axis