Which star has the largest diameter?
a. white dwarf
b. main sequence
c. red giant
d. supergiant
e. regular giant
d
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Consider two diffraction gratings; one has 4000 lines per cm and the other one has 6000 lines per cm
A) The 4000-line grating produces the greater dispersion. B) Both gratings produce the same dispersion, but the orders are sharper for the 4000-line grating. C) Both gratings produce the same dispersion, but the orders are sharper for the 6000-line grating. D) The 6000-line grating produces the greater dispersion.
A planet has mass M = 8.00 × 10^23 kg. At what distance will the centripetal acceleration of an orbiting space station be equal to the gravitational acceleration on Earth's surface? (G = 6.67 × 10^–11 m3·kg–1·s–1)
a. 2.33 × 10^6 m b. 5.44 × 10^12 m c. 5.23 × 10^14 m d. 1.18 × 10^35 m
When a beam of light, originally traveling in air, enters a piece of glass having an index of refraction of 3/2, its wavelength
A) increases by a factor of 3/2. B) is reduced to 2/3 its original value. C) is unaffected.
A uniform 1.0-N meterstick is suspended horizontally by vertical strings attached at each end. A 2.0-N weight is suspended from the 10-cm position on the stick, another 2.0-N weight is suspended from the 50-cm position, and a 3.0-N weight is suspended from the 60-cm position. What is the tension in the string attached at the 100-cm end of the stick?
a. 1.9 N c. 3.5 N b. 3.0 N d. 4.0 N