A surface normal is
A. A normal everyday surface, like a desk
B. A line drawn parallel to a surface
C. A line drawn perpendicular to a surface
D. A line drawn 45° to a surface
C. A line drawn perpendicular to a surface
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Potential of Point-Charges: Four point charges of magnitude 6.00 ?C and are at the corners of a square 2.00 m on each side. Two of the charges are positive, and two are negative. What is the electric potential at the center of this square, relative to infinity, due to these charges? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 76.4 kV B. 0 V C. 153 kV D. 61.0 kV E. 306 kV
A molecule takes 3.0 seconds to diffuse across a membrane. If the thickness of the membrane is doubled, then how long does it take the molecule to diffuse across the thicker membrane?
A. 30 hours B. 24 hours C. 20 hours D. 18 hours E. 12 hours
Spiral arms appear bright because ________
A) they contain far more stars than other parts of the galactic disk B) they are the only places where we find stars within the disk of the galaxy C) they contain more molecular clouds than other parts of the disk D) they contain more hot young stars than other parts of the disk
Humidity can be expressed in many different ways—volume, pressure, mass; but humidity is always
A) the moisture condensation. B) the amount of water vapor in the air. C) equal to relative humidity. D) maximum amount of water vapor in the air at a given temperature.