Resolution: What is the minimum distance between two points on the Moon that could be just resolved by the Keck telescope in Hawaii using a wavelength of 600 nm and having perfect optics? The diameter of this telescope mirror system is 10 m, and the distance to the Moon is 380,000 km.
Fill in the blank(s) with the appropriate word(s).
28 m
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The ozone layer absorbs __________ radiation from sunlight
Fill in the blank(s) with correct word
A mass (M1 = 5.0 kg) is connected by a light cord to a mass (M2 = 4.0 kg) which slides on a smooth surface, as shown in the figure. The pulley (radius = 0.20 m) rotates about a frictionless axle. The acceleration of M2 is 3.5 m/s2. What is the rotational inertia of the pulley?
?
?
A. 0.29 kg?m2 B. 0.42 kg?m2 C. 0.20 kg?m2 D. 0.62 kg?m2 E. 0.60 kg?m2
A 10-?F capacitor in an LC circuit made entirely of superconducting materials (R = 0 ?) is charged to 100 ?C. Then a superconducting switch is closed. At t = 0 s, plate 1 is positively charged and plate 2 is negatively charged. At a later time, Vab = +10 V. At that time, Vdc is
a.
0 V.
b.
3.54 V.
c.
5.0 V.
d.
7.07 V.
e.
10 V.
A satellite in an elliptical orbit about a planet travels much faster when it is directly over a
A) large ocean. B) large island. C) high mountain range. D) great plain or plateau. E) none of the above