A pressure of 10.0 mm Hg is measured using a constant-volume gas thermometer at a temperature of 50.0°C. What is the pressure (in mm Hg) at the zero-point temperature?
a. 31.8
b. 11.8
c. 8.45
d. 54.6
e. 68.3
C
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A 1.8-kg block is projected up a rough 10° inclined plane. As the block slides up the incline, its acceleration is 3.8 m/s2 down the incline. What is the magnitude of the force of friction acting on the block?
A. 5.0 N B. 3.8 N C. 4.2 N D. 4.6 N E. 6.5 N
The further away a galaxy is:
A) the older it is. B) the further ahead in the future it will exist. C) the longer ago it existed. D) the larger it appears. E) the more massive it is.
Molecular Speeds: (a) At what Celsius temperature is the average kinetic energy of a helium gas atom equal to 6.21 × 10-21 J? The Boltzmann constant is 1.38 × 10-23 J/K .(b) What would be the temperature for radon gas?
Fill in the blank(s) with the appropriate word(s).
How many galaxies are needed to get a fair sample to determine what fraction are ellipticals?
A: 5-10. B: 35-45. C: 75-100. D: About 500. E: Over 1000.