What should be the resistance of a light bulb in order for it to draw a 2 amp current when plugged into a 120-volt outlet?
A) 1/60 ohm B) 60 ohms C) 1/30 ohm D) 30 ohms E) 480 ohms
B
Physics & Space Science
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Stellar spectra tell us that ________ is the second most abundant element in the Sun
A) carbon B) helium C) iron D) hydrogen E) oxygen
Physics & Space Science
The ratio of the density of a neutron (r = r0A1/3) to the density of a classical electron (re = ke2/mec2 = 2.8 × 10^-15 m) is
a. 4.3 × 10^2 b. 2.3 × 10^4 c. 1.4 × 10^2 d. 6.9 × 10^-3 e. 4.3 × 10^3
Physics & Space Science
Astronomers have measured the Milky Way's mass by
A. observing its gravitational attraction on matter in and near it. B. using radar. C. sending unmanned space missions to the center of the Galaxy. D. observing magnetic fields in the Solar System.
Physics & Space Science
Significant Figures: The number of significant figures in 0.040 is
A. one. B. two. C. three. D. four.
Physics & Space Science