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
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
Aluminum and _________are added to superalloys to provide corrosion and oxidation resistance.
Fill in the blank(s) with the appropriate word(s).
An air conditioner with a coefficient of performance of 3.5 uses 30 kW of power. How much power is it discharging to the outdoors?
A) 30 kW B) 75 kW C) 105 kW D) 135 kW E) 210 kW