An electric diode is useful for
A) storing electrical energy.
B) boosting voltage.
C) limiting current.
D) voltage modification.
E) changing ac to dc.
Answer: E
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Consider two-dimensional steady conduction near a curved boundary. Determine the difference equation for an appropriate control volume near the node (i, j). The boundary experiences convective heat transfer through a coefficient h to ambient temperature Ta. The surface of the boundary is given by ys = f(x).
GIVEN
- Two-dimensional steady conduction near a curved surface
- Convective boundary condition
- Curved surface given by ys = f(x)
FIND
(a) Difference equation for a node i, j near the surface
SKETCH
Doppler Effect: As shown in the figure, a man is traveling on a bicycle along a straight road that runs parallel to and right next to some railroad tracks. While moving at 10 m/s, he hears the whistle of a train that is behind him, as shown in the figure. The frequency emitted by the train's whistle is 820 Hz, but the frequency the man hears is 774 Hz. The speed of sound is 340 m/s.(a) What frequency is heard by a stationary observer located between the train and the bicycle?(b) What is the speed of the train, and is the train traveling away from or toward the bicycle?
What will be an ideal response?
A motor and a generator are
A. similar devices B. very different devices with different applications C. forms of transformers D. energy sources
When the reflection of an object is seen in a plane mirror, the image is
a. real and upright. b. real and inverted. c. virtual and upright. d. virtual and inverted.