A white dwarf star with a mass equal to that of the sun is about the size of
A) the earth. B) a proton. C) the sun. D) a basketball.
A
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Has Polaris always been the "North Star" , also known as the "Pole Star" ?
a. No, because the Earth's axis slowly changes the direction it points. b. No, because it is a young star which formed only a few hundred years ago. c. Yes, because stars position change little over many centuries. d. No, because the Milky Way blocked our line of site to it for a long time.
The interior of a refrigerator has a volume of 0.600 m3. The temperature inside the refrigerator in 282 K, and the pressure is 101 kPa
If the molecular weight of air is 29 g/mol, what is the mass of air inside the refrigerator? The ideal gas constant is R = 8.314 J/mol•K = 0.0821 L ? atm/mol ? K. A) 500 g B) 560 g C) 140 g D) 270 g E) 750 g
A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV
To the nearest percent, what fraction of an iceberg is submerged? (?ice = 917 kg/m3, ?sea = 1.03 × 103 kg/m3.)
A. 95% B. 93% C. 91% D. 89% E. 77%