A parallel-plate capacitor with plate separation of 1.0 cm has square plates, each with an area of 6.0 × 10-2 m2
What is the capacitance of this capacitor if a dielectric material with a dielectric constant of 2.4 is placed between the plates, completely filling them? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 1.3 × 10-10 F
B) 1.3 × 10-12 F
C) 15 × 10-14 F
D) 64 × 10-14 F
E) 15 × 10-12 F
A
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If the Sun collapsed to a black hole, Earth's gravitational attraction to it would be
A) more. B) less. C) the same.
At atmospheric pressure, 45 moles of liquid helium are vaporized at its boiling point of 4.22 K. The heat of vaporization of helium, at atmospheric pressure, is 2.09 × 104 J/kg,
and the atomic weight of helium is 4.00 g/mol. The change in the entropy of the helium, as it vaporizes, is closest to A) 890 J/K. B) 14,000 J/K. C) 18,000 J/K. D) -9400 J/K. E) -14,000 J/K.
A 14-mm tall postage stamp is 4.0 mm from a convex lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A) 14 mm B) 8.7 mm C) 1.4 mm D) 1.1 mm
Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. B) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Virtual particles created near the black hole are constantly annihilating each other, causing a high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.