What are the appropriate units for the Sun's luminosity?
A) watts
B) joules
C) newtons
D) kilograms
A) watts
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When we say that the speed of sound is measured under adiabatic conditions we assume that
a. the time associated with heat conduction is slow relative to the speed of the wave. b. no heat can flow between the system and its surroundings. c. the speed of the wave is directly proportional to the bulk modulus. d. the speed of the wave is proportional to the square root of the bulk modulus. e. air is an ideal gas.
A monatomic ideal gas with an initial pressure of 500 kPa and an initial volume of 1.80 L expands isothermally to a final volume of 5.20 L. How much work is done on the gas in this process?
A) 955 J B) 900 J C) 875 J D) 1570 J E) 1700 J
Two wires support a post, with dimensions as shown in the figure. If d = 14 m, what is the value of x?
a.
7.5 m
b.
6.5 m
c.
18.3 m
d.
5.2 m
Groombridge 34 is an M1 V star. Based on this information, which of the following are true? I. Groombridge 34 has a surface temperature that is less than the Sun. II. Groombridge 34 has a mass that is greater than that of the Sun. III. Groombridge 34 is less luminous than the Sun. IV. Groombridge 34 is located near the middle of the H-R diagram
a. I & II b. II & IV c. I & IV d. I & III e. II & III