Which of the following cannot be determined from the spectrum of a star?
a. chemical composition
b. surface temperature
c. radial (along line of sight) velocity
d. tangential (perpendicular to line of sight) velocity
e. Both c and d
D
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An 8000-kg aluminum flagpole 100-m high is heated by the Sun from a temperature of 10°C to 20°C. Find the increase in internal energy (in J) of the aluminum. (The coefficient of linear expansion is 24 × 10?6 (°C)?1, the density is 2.7 × 103 kg/m3, and the specific heat of aluminum is 0.215 cal/g?°C.)
A. 7.2 × 105 B. 7.2 × 107 C. 7.2 × 103 D. 7.2 × 101 E. 7.2 × 102
A white dwarf is a former
A) low-mass star. B) high-mass star. C) white giant.
A charged capacitor is connected to an inductor. At time t = 0 the charge on the capacitor is Q = 6?C. At time t = 2 ms the charge on the capacitor is zero for the first time. What is the amplitude of the current at that same instant?
A) 2.38 mA B) 4.71 mA C) 0.78 mA D) 1.53 mA E) 1.19 mA
When we see a half Moon in the sky, the lines between Earth, Moon, and Sun
A) are equal in length. B) are parallel to one another. C) form a right triangle. D) all of the above