Standing Sound Waves: The lowest tone to resonate in pipe of length L that is open at both ends is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?
A. 200 Hz
B. 400 Hz
C. 600 Hz
D. 800 Hz
E. 900 Hz
Answer: E
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Suppose we hold a sample of helium gas at a constant temperature while we slowly compress it in a cylinder until its volume has decreased by a factor of 4. During this process, the gas’s entropy
A. increases. B. decreases. C. remains the same. D. Does something else (specify).
Elementary Particles: Which of the following statements about hadrons are correct? (There may be more than one correct choice.)
A. Hadrons are composed of leptons. B. All hadrons are composed of quarks. C. All hadrons interact by the strong nuclear force. D. Electrons, protons, and neutrons are commonly-occurring hadrons. E. Protons and neutrons are hadrons, but the electron is not.
An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 26.0 m/s. What is the resistance force on the automobile at this speed? (1 hp = 746 watts)
a. 18,600 N c. 1020 N b. 410,000 N d. 861 N
A magnifying glass uses a converging lens with a refractive power of 20 diopters. What is the magnification if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 5.0 B) 3.0 C) 4.0 D) 1.0 E) 2.0