Due to the cycle of precession, in 12,000 years, which star will replace Polaris as the guiding North Star?
a. Betelgeuse
b. Sirius
c. Vega
d. Rigel
e. Spica
c
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Any change of the energy of a system occurs because of
a. energy transfer across the boundaries of the system. b. combustion of fuels within the system. c. radioactive decay of elements within the system. d. all of the above. e. only (b) and (c) above.
As the illuminated part of the Moon grows larger from new to full, it is said to "wane"
a. True b. False Indicate whether the statement is true or false
The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4
96 × 107 m and the distance from the earth at the time of observation is 4.4 × 1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune? A) 0.90 mrad B) 1.1 mrad C) 1.3 mrad D) 1.5 mrad E) 1.7 mrad
Supernovae have little effect on the development of planets such as Earth
a. True b. False Indicate whether the statement is true or false