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
E
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An object 4 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image position (in cm)?
a. ?8 b. ?4 c. ?2 d. ?6 e. 30
What is the common trait of all main-sequence stars?
A) They generate energy through hydrogen fusion in their core. B) They are in the final stage of their lives. C) They are all spectral type G. D) They all have approximately the same mass.
Fluid Flow: An incompressible ideal fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8.0 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.0 cm?
A. 0.32 m/s B. 0.64 m/s C. 1.3 m/s D. 2.6 m/s E. 5.1 m/s
What is the approximate composition of the interstellar medium (by mass) in our region of the Milky Way?
A) 60% hydrogen, 40% helium B) 70% hydrogen, 28% helium, 2% heavier elements C) 70% hydrogen, 20% helium, 10% heavier elements D) 50% hydrogen, 48% helium, 2% heavier elements