Two 5.0-µC point charges are 12 cm apart. What is the electric potential (relative to infinity) of this combination at the point where the electric field due to these charges is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 )
A) 25 MV B) 12.5 MV C) 1.5 MV D) 0.0 MV E) 0.75 MV
C
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A 50 m long by 5 m diameter rocket at launch is moving upward at 180 km/h when its sides are at -45ºC and the surrounding air is 25ºC. Estimate the heat transfer from the surrounding air.
What will be an ideal response?
A relativistic proton has a momentum of 1.0 × 10-17 kg ? m/s and a rest energy of 0.15 nJ. What is the kinetic energy of this proton? (c = 3.00 × 108 m/s, mproton = 1.67 × 10-27 kg)
A) 1.3 pJ B) 1.6 pJ C) 3.0 pJ D) 2.2 pJ E) 2.5 pJ
What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 2.0 B) 3.0 C) 3.6 D) 4.0 E) 6.3
As we look at larger and larger scales in the universe, we find:
A) smaller and smaller masses. B) almost exclusively visible matter. C) a larger and larger percentage of the matter is visible. D) a larger and larger percentage of the matter is dark. E) an equal amount of visible and dark matter.