The wavelength of a traveling wave can be calculated if one knows the:
a. frequency.
c. amplitude and frequency.
b. speed and amplitude.
d. frequency and speed.
D
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Talk-radio station KOOK is at approximately 90 megahertz on the radio dial. This means that KOOK broadcasts
A) an electromagnetic wave whose frequency is 90 vibrations/second. B) an electromagnetic wave whose frequency is 90 × 106 vibrations/second. C) an electromagnetic wave whose wavelength is 90 × 106 vibrations per second. D) a sound wave whose frequency is 90 × 106 vibrations/second. E) a sound wave whose frequency is 90 vibrations/second.
An electric motor draws a current of 2.60 A from a 18.0-V battery when it runs at normal speed. If the motor's armature is "jammed" so that it cannot rotate, the current suddenly rises to 10.0 A. What is the back emf of the motor when running at normal speed?
a. 4.68 V b. 10.0 V c. 22.7 V d. 13.3 V e. 133 V
For silver at a tensile stress of 30 MPa and a temperature of 715°C, what is the primary creep mechanism?
What will be an ideal response?
First Law of Thermodynamics: During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the work done by the gas in the process?
A. 0 J B. 5.0 J C. -5.0 J D. -10 J