An object travels halfway around a circle at a constant instantaneous speed 
.What is the magnitude 
of its average velocity during this time interval?
A. 
B. 1.41
C. 1.57
D./1.41
E. /1.57
E. /1.57
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The central part of Earth's core is solid
Indicate whether the statement is true or false
A straight wire is bent into the shape shown. Determine the net magnetic force on the wire
a.
Zero
b.
IBL in the +z direction
c.
IBL in the ?z direction
d.
1.7 IBL in the +z direction
e.
1.4 IBL in the ?z direction
If you jounce up and down on a bathroom scale, what varies on the scale reading is
A) mg. B) the normal force. C) both of these D) neither of these
How does the resistance of a thick piece of copper wire compare to the resistance of a thin piece of copper wire?
A. The resistance of the thin piece is greater than that of the thick piece. B. The resistance of the thick piece is greater than that of the thin piece. C. Both the wire and narrow piece of copper provide the same resistance.