A beaker is filled to the 500-ml mark with alcohol. What increase in volume (in ml) does the beaker contain when the temperature changes from 5°C to 30°C? (Neglect the expansion of the beaker, evaporation of alcohol and absorption of water vapor by alcohol.) ?alcohol = 1.12 × 10?4/°C
A. 0.47
B. 0.93
C. 1.4
D. 1.7
E. 2.5
Answer: C
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If you were to inhale a few breaths from a helium gas balloon, you would probably experience an amusing change in your voice. You would sound like Donald Duck or Alvin the Chipmunk. What is the cause of this curious high-pitched effect?
A) The helium causes your vocal cords to tighten and vibrate at a higher frequency. B) For a given frequency of vibration of your vocal cords, the wavelength of sound is less in helium than it is in air. C) Your voice box is resonating at the second harmonic, rather than at the fundamental frequency. D) Low frequencies are absorbed in helium gas, leaving the high frequency components, which result in the high, squeaky sound. E) Sound travels faster in helium than in air at a given temperature.
Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(4x)cos(3t), where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75 b. 0.25 c. 1.3 d. 12 e. 3.0
If the plane of the Earth's equator were not tilted with respect to the ecliptic plane,
a. the daylight period of Earth would be the same year-round. b. there would be no seasonal changes. c. Earth's poles would not experience six-month-long nights. d. All of the above.
What is the magnitude of the free-fall acceleration at a point that is a distance 2R above the surface of the Earth, where R is the radius of the Earth?
a. 4.8 m/s2 b. 1.1 m/s2 c. 3.3 m/s2 d. 2.5 m/s2 e. 6.5 m/s2