A hypothetical star has a parallax of 0.05 arcseconds. How faraway is it?
a) 50 parsecs
b) 10 parsecs
c) 5 parsecs
d) 0.05 parsecs
e) 20 parsecs
Ans: e) 20 parsecs
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Water that is denser than surrounding water sinks. With respect to the densities of deeper water, how far does it sink?
A) until it encounters water of the same density B) until it encounters water that is less dense C) until it encounters water that is denser D) None of the above.
How do we estimate the surface temperature of a star?
A) by measuring the Doppler shifts of absorption lines in its chromosphere B) by obtaining its spectrum and classifying the spectral type C) by estimating its parallax D) by estimating its luminosity
You can safely hold your fingers on both sides of a candle flame due mainly to
A) conduction. B) convection. C) radiation. D) none of the above
The maximum theoretical efficiency of a Carnot heat engine operating between reservoirs at the steam point and at room temperature is about:
A. 10% B. 20% C. 50% D. 80% E. 99%