Five gas molecules are found to have speeds of 100, 200, 300, 400, and 500 m/s. The rms speed (in m/s) is
a. 390.
b. 300.
c. 360.
d. 330.
e. 320.
D
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A negative mechanical property of ceramics is that they are ______________.
Fill in the blank(s) with the appropriate word(s).
If the Moon's orbital plane was aligned with the celestial equator we could
a. have eclipses every month. b. never have eclipses. c. have eclipses only at solstice. d. have eclipses only at the equinoxes.
An optical system comprises in turn, from left to right: an observer, a lens of focal length +30 cm, an erect object 20 mm high, and a convex mirror of radius 80 cm
The object is between the lens and the mirror, 20 cm from the lens and 50 cm from the mirror. The observer views the image that is formed first by reflection and then by refraction. What is the position of the final image, measured from the mirror? A) 90 cm B) 102 cm C) 114 cm D) 126 cm E) 138 cm
In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00 × 108 m/s, Wien displacement law constant equals 2.90 × 10-3 m ? K, ? = 5.670 × 10-8 W/m2 ? K4)
A) 1.0 × 1014 Hz B) 8.0 × 1014 Hz C) 2.3 × 1014 Hz D) 6.7 × 1014 Hz E) 4.1 × 1014 Hz