Two water waves, call them X and Y, have the same amplitude but different wavelengths: X has a larger wavelength than Y. Regarding their frequencies and their energies,
A) Y has the larger frequency and carries the greater energy.
B) Y has the larger frequency and X carries the greater energy.
C) X has the larger frequency and Y carries the greater energy.
D) X has the larger frequency and carries the greater energy.
E) Y has the larger frequency and the two waves carry the same energy.
A
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The maximum induced emf in a generator whose coils are rotating at 240 rpm is 35 V. If, instead, it is desired to generate a maximum emf of 45 V but with half the magnetic field, what rotation rate must be used?
A. 380 rpm B. 190 rpm C. 310 rpm D. 165 rpm E. 610 rpm
Aluminum and _________are added to superalloys to provide corrosion and oxidation resistance.
Fill in the blank(s) with the appropriate word(s).
The coil shown in the figure has 2 turns, a cross-sectional area of 0.20 m2, and a field (parallel to the axis of the coil) with a magnitude given by B = (4.0 + 3.0t2) T, where t is in s. What is the potential difference, VA?VC, at t = 3.0 s?
A. ?7.2 V B. +7.2 V C. ?4.8 V D. +4.8 V E. ?12 V
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A) 30 kW B) 75 kW C) 105 kW D) 135 kW E) 210 kW