Which of the following choices is an appropriate unit for measuring entropy changes?
a. J • K
c. J/s
b. N • K
d. J/K
D
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A converging mirror with a focal length f forms an image of the moon. Where is the image?
A. Very close to f behind the mirror B. At the surface of the mirror C. At the radius of curvature of the mirror D. Very close to f in front of the mirror
Point charges q and Q are positioned as shown. If q = +2.0 nC, Q = ?2.0 nC, a = 3.0 m, and b = 4.0 m, what is the electric potential difference, VA?VB?
A. 8.4 V B. 6.0 V C. 7.2 V D. 4.8 V E. 0 V
If I1 goes to the right through R1, I2 goes to the right through R2, and I3 goes to the right through R3, what is the resulting equation resulting from applying Kirchhoff’s loop rule for a clockwise loop around the perimeter of the circuit?
a.
8.0 V + I1R1 + I3R3 = 0
b.
8.0 V + I1R1 – I3R3 = 0
c.
8.0 V – I1R1 + I3R3 = 0
d.
–8.0 V + I1R1 + I3R3 = 0
The intensity of a sound wave is a measure of:
1.energy/area 2.force/time 3.momentum change/time 4.power/time 5.pressure difference/time 6.None of the above.