Which jar will roll down an incline in the shortest time, an empty one or one filled with peanut butter?
A) the empty jar
B) both reach the bottom at the same time
C) the filled jar
D) need more information
Answer: C
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Why did Saturn's rings appear very different in 1995 and 2003?
What will be an ideal response?
The heat index accounts for the "real feel" due to the effects of
a. temperature and perspiration. b. temperature and pressure. c. temperature and humidity. d. humidity and pressure.
Two copper wires have electric fields with identical strengths in their interior directed along the wire. Wire 1 has twice the diameter of wire 2. How do the currents carried by the wires compare?
A. 
B. 
C. 
D. 
E. 
F. We can’t compare using only the given information.
A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = ?2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
a. 3.2 ILB b. 5.0 ILB c. 4.2 ILB d. 3.6 ILB e. 1.0 ILB