Standing Waves on a String: When a guitar is tuned to adjust it pitch, what is it that is changed?
A. The wavelength of the fundamental.
B. The frequency of the fundamental.
C. The amplitude of the fundamental.
Answer: B
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A soccer ball is released from rest at the top of a grassy incline. After 8.6 seconds, the ball travels 87 meters and 1.0 s after this, the ball reaches the bottom of the incline
(a) What was the magnitude of the ball's acceleration, assume it to be constant? (b) How long was the incline?
A 5.0-?F capacitor and a 7.0-?F capacitor are connected in series across an 8.0-V potential source. What is the potential difference across the 5.0-?F capacitor?
A) 0 V B) 8.0 V C) 2.7 V D) 3.6 V E) 4.7 V
A traffic flow on a freeway is very dense and it is proposed that a fluid flow could possibly simulate the flow. If it was decided to study the feasibility of the proposal, which flow would be a possibility?
(A) An incompressible flow (B) A compressible flow with M < 1 (C) A compressible flow with M > 1 (D) A compressible flow with M = 1
A copper-nickel alloy is used in a heat exchanger for a power plant that uses ocean water for cooling. One way to check the consistency of the alloy’s composition across batches of material is to determine the lattice parameter of the alloy. We know that copper and nickel are both FCC crystals and that copper and nickel form a limited-solid solution, and also that the lattice parameter of the alloy depends upon the composition. To determine the lattice parameter of the alloy, the angles of the diffraction peaks from a polycrystalline piece of the alloy are measured in an x-ray diffractometer with a cobalt x-ray tube. Cobalt is used because the cobalt K? radiation is of a lower energy than is the absorption edge in either copper or nickel, and no characteristic x-rays will be generated
in the copper and nickel. Also, the copper and nickel should be relatively transparent to the cobalt K? radiation. With the cobalt K? radiation, the lowest angle intense peak is measured at 25.74°. The lattice parameter of copper is 0.361 nm and for nickel it is 0.352 nm, and the wavelength of cobalt K? radiation is 0.1790 nm. (a) What are the Miller indices of this peak, and what is the lattice parameter of this copper-nickel mixture? (b) Assuming that the lattice parameter varies linearly with composition in this alloy, what is the percent of nickel and copper?