We know that giant stars are larger in diameter than the sun because
a. they are more luminous but have about the same temperature.
b. they are less luminous but have about the same temperature.
c. they are hotter but have about the same luminosity.
d. they are cooler but have about the same luminosity.
e. they have a larger absolute magnitude than the sun.
A
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What are the three layers of the Sun's atmosphere, in order of increasing distance from the surface?
a. Corona, chromosphere, photosphere b. Photosphere, corona, chromosphere c. Photosphere, chromosphere, corona d. Chromosphere, photosphere, corona
A steel bar of rectangular cross section (a 5 38 mm, b 5 50 mm) carries a tensile load P. The allowable stresses in tension and shear are 100 MPa and 48 MPa, respectively. The maximum permissible load Pmax is approximately:
(A) 56 kN
(B) 62 kN
(C) 74 kN
(D) 91 kN
Bob is in a spaceship going by you at 90% of the speed of light, but in an upright standing position. Bob measures his mass to be 50 kg, his height to be 2.0 meters, and his waist size to be 80 cm. What would you say about his measurements?
A) His mass is more than 50 kg, his height is still 2.0 meters, and his waist size is less than 80 cm. B) His mass is more than 50 kg, his height is less than 2.0 meters, and his waist size is less than 80 cm. C) His mass is less than 50 kg, his height is more 2.0 meters, and his waist size is less than 80 cm. D) You would measure the same mass and size as he does.
The Very Large Array radio telescope in New Mexico is an example of the use of which astronomical technique?
a. spectral analysis b. photometry c. interferometry d. resolving power e. cosmic analysis