A disk has a moment of inertia of 3.0 × 10^-4 kg•m2 and rotates with an angular speed of 3.5 rad/sec. What net torque must be applied to bring it to rest within 3.7 s?
a. 4.6 × 10^-4 N•m
c. 3.5 × 10^-4 N•m
b. 7.5 × 10^-4 N•m
d. 2.8 × 10^-4 N•m
D
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The hydrogen Balmer line H? has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar? Is it a "redshift" or "blue shift"?
a. 0; no change b. 2430.5; redshift c. 486.1; blue shift d. 1944.4; blueshift e. 1944.4; redshift
The energy of a photon
a. is proportional to the wavelength of the light. b. is inversely proportional to the wavelength of the light. c. depends only on the speed of the light. d. depends only on the mass of the photon. e. depends on both the mass and speed of the photon.
Power is transmitted at high voltages because the corresponding current in the wires is
A) also high to deliver appreciable power to distant places. B) low so that overheating of the wires is minimized. C) either of these D) neither of these
Which of the following are quanta of a matter field?
A) electrons B) quarks C) Both of the above. D) photons E) All of the above.