If an electric charge is shaken up and down frequently enough
A) sound can be emitted.
B) light can be emitted.
C) both of these
D) neither of these
Answer: B
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A plane wall, 7.5 cm thick, generates heat internally at the rate of 105 W/m3 . One side of the wall is insulated, and the other side is exposed to an environment at 90°C. The convection heat transfer coefficient between the wall and the environment is 500 W/(m2 K). If the thermal conductivity of the wall is 12 W/(m K), calculate the maximum temperature in the wall.
GIVEN
FIND
- The maximum temperature in the wall (Tmax)
ASSUMPTIONS
- The heat loss through the insulation is negligible
- The system has reached steady state
- One dimensional conduction through the wall
SKETCH
Our Solar System resides in the _______________ Galaxy
Fill in the blank(s) with correct word
What is the wavelength of light in water if it has a frequency of 7.8 1014 Hz?
What will be an ideal response?
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is
A) 0 m/s2. B) 5 m/s2. C) 8 m/s2. D) 24 m/s2.