Some large clusters of galaxies do not appear to contain enough mass to hold themselves together
a. True
b. False
Indicate whether the statement is true or false
True
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In a semiconductor doped with donor atoms, the conduction-band energy is 1.1 eV and the donor energy level is 1.0 eV. At a high temperature there are approximately as many electrons in the conduction band as there are holes in the valence band. For this semiconductor, the Fermi energy is approximately equal to:
(a) 1.1 eV (b) 1.0 eV (c) 1.05 eV (d) 0.55 eV
Ideal Gas Law: A balloon originally has a volume of 1.0 m3 when the gas in it is at 20°C and under a pressure of 1.0 atm. As it rises in the earth's atmosphere, its volume expands. What will be its new volume if its final temperature and pressure are -40°C and 0.10 atm?
A. 2.0 m3 B. 4.0 m3 C. 6.0 m3 D. 8.0 m3
Ideal Gas Law: On a cold day, you take in 4.2 L of air into your lungs at a temperature of 0°C. If you hold your breath until the temperature of the air in your lungs reaches 37°C, what is the volume of the air in your lungs at that point, assuming the pressure does not change?
A. 4.2 L B. 4.4 L C. 4.6 L D. 4.8 L E. 5.0 L
Three identical 4.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 4.0 m/s2 . What is the magnitude of the force exerted on the right cube by the middle cube in this case?
a. 16 N b. 32 N c. 24 N d. 19 N e. none of the above