A cubic box with sides of 20 cm contains 2 × 1023 molecules of helium with a root-mean-square (rms) speed of 200 m/s
The mass of a helium molecule is 3.4 × 10-27 kg. What is the average pressure exerted by the molecules on the walls of the container?
A)
3.39 kPa
B)
1.13 kPa
C)
570 Pa
D)
2.26 kPa
E)
9.1 Pa
B
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Thermal Expansion: The coefficient of linear expansion of copper is 17 × 10-6 K-1. A sheet of copper has a round hole with a radius of 3.0 m cut out of it. If the sheet is heated and undergoes a change in temperature of 80 K, what is the change in the radius of the hole?
A. It decreases by 4.1 mm. B. It increases by 4.1 mm. C. It decreases by 8.2 mm. D. It increases by 8.2 mm. E. It does not change.
Sunspots occur in ______________ with the leading spot and the trailing spot having ________________ magnetic polarity
a. singles, same b. pairs, opposite c. singles, opposite d. pairs, same e. none of the others
I drop a 55-g golf ball from 2.50 m high. It rebounds to 1.65 m. How much energy is lost?
a. 0.46 J b. 4.6 J c. 0.51 J d. 0.41 J e. 0
A rectangular box is positioned with its vertices at the following points:
A = (0,0,0) C = (2,4,0) E = (0,0,3) G = (2,4,3) B = (2,0,0) D = (0,4,0) F = (2,0,3) H = (0,4,3) If the coordinates all have three significant figures, the angle between the line segments AG and AH is closest to: A) 21.8°. B) 22.5°. C) 26.6°. D) 36.9°. E) 45.0°.