A laboratory vacuum pump can reduce the pressure to 1.0 × 10-7 Pa. If the volume of the chamber is 0.500 m3 and the temperature is 27°C, how many molecules are left inside the chamber?
A) 1.2 × 1013
B) 2.4 × 1013
C) 1.2 × 1012
D) 2.4 × 1012
E) 1.2 × 1014
A
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A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected?
a. 47.3° b. 41.2° c. 51.1° d. 58.7° e. 49.8°
The most abundant gas in the atmosphere is
a. oxygen. b. nitrogen. c. water vapor. d. carbon dioxide.
Which of the following statements about parallax is not true?
A) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes. B) The existence of stellar parallax is direct proof that Earth orbits the Sun. C) Measurement of stellar parallax allows us to determine distances to nearby stars. D) Observing stellar parallax requires only a single photograph taken through a powerful telescope. E) Ancient astronomers were unable to detect stellar parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe.
A wire that is 1.0 mm in diameter and 3.5 m long stretches 3.5 mm when an 8.0-kg tool is hung from it
(a) What is Young's modulus for the material from this wire is made? (b) What is the effective spring constant for the stretching wire?