If Q = 400 ?C and the potential difference VA ? VB = ?10 V in the circuit segment shown below, what is the current in the resistor?
a.
1.0 mA right to left
b.
1.0 mA left to right
c.
3.5 mA right to left
d.
3.5 mA left to right
e.
None of the above
a
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A mouse is running away from a cat at 0.75 m/s and, at 1.25 m from his mouse hole, he accelerates at a constant rate until he reaches his hole safely, 0.75 s later. What acceleration did he undergo during the final 1.25 m of his escape?
A. 1.8 
B. 1.2
C. 4.8
D. 2.4
E. 6.4
Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/
A) A) 1.0 × 10-5 T B) 2.0 × 10-5 T C) 3.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T
If the magnitude difference between one star and another is 8, the stars differ in brightness by a factor of
a. 2.51. b. 20. c. 7. d. 1580.
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
a. concave mirror farther than one focal length from the burning candle. b. a convex mirror farther than one focal length from the burning candle. c. a biconcave lens farther than one focal length from the burning candle. d. a concave mirror closer than one focal length to the burning candle. e. a convex lens closer than one focal length to the burning candle.