The lowest A on a piano has a frequency of 27.5 Hz. If the tension in the 2.0-m long string is 151 N and one-half wavelength occupies the string, what is the mass of the string?
a. 100 g
c. 37 g
b. 25 g
d. 50 g
B
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Why (experimentally) is a set of quantons prepared in a superposition of a given observable’s eigenvectors different from a classical mixture of quantons that have “already collapsed” to the different eigenvectors (with the same probabilities as predicted by the superposition)?
A. We can (in appropriate circumstances) show that the superposition is an eigenvector of some other observable, but this is not possible for a mixture. B. We can construct situations where quantons in the superposition state exhibit interference effects that cannot be observed for a mixture. C. Both A and B. D. Neither A nor B (explain).
Which of the following analogies best describes how the structure of the galaxy's spiral arms is maintained?
A) Like military jets flying in formation above a football stadium, the stars in the spiral arms keep a spiral-shaped formation as they orbit the galaxy. B) Like cars slowing in traffic to look at an accident, stars slow as they pass through the spiral arms. C) Like a coiling rope, the spiral arms wind up tighter with every galactic rotation. D) Like the fins of a giant pinwheel toy, the spiral arms carry a set of bright stars around as they sweep through the galaxy.
The fossil fuel deposits we use today are the remains of organisms from which period in Earth's history?
A) The Cretaceous Period B) The Carboniferous Period C) The Cambrian Period D) The Archaean Eon
The exterior of a supersonic airplane is made of aluminum, which has a coefficient of linear expansion of 24 × 10-6 K-1. At 15°C, the plane measures 62.1 m in length
When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the plane? A) 32 cm B) 20 cm C) 36 cm D) 24 cm E) 28 cm