Electric Field of Point-Charges: A +5.0-?C point charge is placed at the 0 cm mark of a meter stick and a -4.0-?C charge is placed at the 50 cm mark. What is the net electric field at the 30 cm mark? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 4.0 × 105 N/C
B. 5.0 × 105 N/C
C. 9.0 × 105 N/C
D. 1.4 × 106 N/C
Answer: D
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An observer in the Northern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
Reflecting telescope objectives here on Earth do not have a problem with
a. "seeing". b. diffraction. c. color fringes on the image. d. All of the other choices are correct.
What does CCD stand for?
A. cosmic-ray channel detector B. charge collecting device C. channel-coupled detector D. charge-coupled device
The rms speed of a certain sample of carbon dioxide molecules, with a molecular weight of 44.0 g/mole, is 396 m/s. What is the rms speed of water vapor molecules, with a molecular weight of 18.0 g/mol, at the same temperature as the carbon dioxide?
A) 253 m/s B) 387 m/s C) 421 m/s D) 506 m/s E) 619 m/s