RLC Circuits: A 120-V rms voltage at 1.0 kHz is applied to a 2.0-mH inductor, a 4.0-?F capacitor and a resistor. If the rms value of the current in this circuit is 0.40 A, what is the value of the resistor?
A. 300 ?
B. 95 ?
C. 420 ?
D. 120 ?
E. 240 ?
Answer: A
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Suppose the force of the air drag on an object is proportional to the speed of the object and in the direction opposite the object's velocity. If you throw an object upward, the magnitude of its acceleration is greatest
A) right after the object is released. B) at the top of its trajectory. C) The acceleration of the object is the same throughout the entire trajectory.
The figure shows two point sources of light, A and B, that emit light waves in phase with each other. A is a distance of 3? from point P. B is distant 5? from P. (? is the wavelength.) The phase difference between the waves arriving at P from A and B is
?
?
A. 0 rad. B. ? rad. C. 2? rad. D. 3? rad. E. 4? rad.
The energy per gallon of liquid hydrogen, compared to gasoline, is about
A. 3x less B. about the same C. 3x more D. 12x more
It is decided to electropolish a complex cast copper sculpture, because the surface is too complex for mechanical polishing, and the as-cast surface does not have the required appearance. Through experimentation with piece of copper, it is found that a current density of 1 A/cm2 produces the required appearance. It is estimated that the entire surface of the sculpture is 100 cm2 , and it is decided to electropolish the sculpture at 100 A of current. No more than 0.0001 m of copper should be removed from the sculpture, so that the design shape is not altered. Determine the maximum time for electropolishing if the process is 100 % efficient?
What will be an ideal response?