If the earth's electric field is 100 N/C downward, what must be the charge on a 1-kg object so that it would be "weightless"?
A)
9.8 C
B)
0.22 C
C)
1.0 C
D)
-9.8 × 10-2 C
E)
9.8 × 10-2 C
D
Physics & Space Science
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A. 60 m/s B. 20 m/s C. 30 km/h D. 120 m/s E. 30 m/s
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The greater the hydraulic gradient the
A) slower the flow. B) faster the flow. C) greater the porosity. D) less the permeability.
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A hypernova creates:
A) a black hole. B) a pulsar. C) a neutron star. D) short-duration gamma-ray bursts. E) Both B and C are correct.
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A seed is 15 mm in front of a converging lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?
A) 11 mm B) 5.5 mm C) 3.8 mm D) 3.2 mm
Physics & Space Science