A fusion reaction generates energy by combining lighter nuclei into a heavier nucleus, plus additional particles
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Two coaxial parallel plate discs are situated relative to each other as shown in the sketch. The diameter of the upper plate is 20 cm, and that of the lower plate is 40 cm. The lower plate is maintained at a uniform temperature of 500 K and the upper temperature is maintained at 456 K. To maintain these relative temperatures, a heater has to be installed in the upper plate. Assuming an environmental temperature of the surroundings at 300 K, determine the power necessary of the heater in the upper plate to maintain the two constant plate temperatures under steady state conditions.
GIVEN
• Two coaxial parallel plate discs at distance of L = 20 cm=0.2 m
• Upper plate diameter (D1) = 20 cm = 0.2 m
• Lower plate diameter (D2) = 40 cm = 0.4 m
• Upper plate temperature (T1) = 456 K
• Lower plate temperature (T2) = 500 K
• Surrounding temperature (Tsurr) = 300 K
FIND
(a) Power necessary of the heater in upper plate to maintain the constant plate temperatures under steady state conditions.
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
You are standing on a bathroom scale in an elevator that is not moving and it reads 500 N. The elevator then moves downward at a constant velocity of 4.50 m/s. What does the scale read?
A. 100 N B. 450 N C. 500 N D. 750 N E. 250 N
Harmonics
a. are components of a complex waveform. b. have frequencies that are integer multiples of the frequency of the complex waveform. c. are pure tones. d. have sinusoidal waveforms. e. all of the above
If an object is in equilibrium, the net torque about any arbitrary axis must be zero
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