Estimation: A reasonable estimate for the mass of a typical female college student is
A. 20 kg.
B. 50 kg.
C. 150 kg.
D. 200 kg.
Answer: B
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Index of Refraction: A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is
A. n = cv. B. n = (v/c)2. C. n = v/c. D. n = c/v. E. n = (c/v)2.
A neutron star is
A) the remains of a star that died in a massive star supernova (if no black hole was created). B) the remains of a star that died by expelling its outer layers in a planetary nebula. C) a star made mostly of elements with high atomic mass numbers, so that they have lots of neutrons. D) an object that will ultimately become a black hole.
One philosophical difference between Newtonian and quantum physics is
A) nature is predictable according to Newtonian physics, but nature is unpredictable according to quantum theory. B) Newtonian physics is unable to deal with such abstractions as energy, whereas quantum physics is able to deal with these abstractions. C) Newtonian physics is now known to be incorrect, but scientists have proven that quantum physics is absolutely correct. D) nature is unpredictable according to Newtonian physics, but nature is predictable according to quantum theory. E) Newtonian physics emphasizes the measurement process whereas quantum physics recognizes that the measurement process should not be included in physical theories.
A steel sphere sits on top of an aluminum ring. The steel sphere (a = 1.10 × 10^-5/°C) has a diameter of 4.0000 cm at 0°C. The aluminum ring (a = 2.40 × 10^-5/°C) has an inside diameter of 3.9900 cm at 0°C. Closest to which temperature given will the sphere just fall through the ring?
a. 462°C c. 116°C b. 193°C d. 57.7°C