Determine the energy stored in the 60-?F capacitor
a.
2.4 mJ
b.
3.0 mJ
c.
3.6 mJ
d.
4.3 mJ
e.
6.0 mJ
b
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Consider two future observatories in space:
Observatory A consists of a single 50-meter telescope. Observatory B is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across. Which observatory can detect dimmer stars, and which one can see more detail in its images? (Assume all else is equal, such as quality of optics, types of instruments, and so on.) A) Observatory A can detect dimmer stars, and Observatory B reveals more detail in images. B) Observatory B can detect dimmer stars, and Observatory A reveals more detail in images. C) Observatory A both detects dimmer stars and reveals more detail in images. D) Observatory B both detects dimmer stars and reveals more detail in images. E) Both observatories have the same capabilities, but Observatory B would be cheaper to build.
When you remove electrons from a metal cup, the cup becomes
A) negatively charged. B) positively charged. C) ionized.
A majorette takes two batons and fastens them together in the middle at right angles to make an "x" shape. Each baton was 0.90 m long and each ball on the end is 0.20 kg. (Ignore the mass of the rods.) What is the moment of inertia if the arrangement is spun around an axis through the center perpendicular to both rods?
a. 0.064 kg•m2 c. 0.075 kg•m2 b. 0.096 kg•m2 d. 0.16 kg•m2
A round 0.85-mm-diameter hole is illuminated by infrared light of wavelength 2.5 ?m What is the angle of the first dark fringe in the resulting pattern?
A) 4.8 × 10-2 degrees B) 3.6 × 10-3 degrees C) 0.21 degrees D) 1.2 × 10-2 degrees