Glowing plasma is evident in the light from
A) a fluorescent lamp.
B) the aurora borealis (northern lights).
C) some TV screens.
D) all the above
E) none of the above
Answer: D
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An ideal spring stretches by 21.0 cm when a 135-N object is hung from it. If instead you hang a fish from this spring, what is the weight of a fish that would stretch the spring by 31cm
A) 199 N B) 91 N C) 145 N D) 279 N
Determine by means of a flux plot the temperatures and heat flow per unit depth in the ribbed insulation shown in the accompanying sketch.
GIVEN
The sketch below
FIND
(a) The temperatures
(b) The heat flow per unit depth
ASSUMPTIONS
Steady state conditions
Two dimensional heat flow
The heat loss through the insulation is negligible
The thermal conductivity of the material is uniform
SKETCH
A circumferential cast iron fin attached to a compressor housing is 1 inch thick, 3 in long, 3 in diameter, and the convective heat transfer coefficient is 16 Btu/hr?ft^2? ºF. If the base temperature is 160ºF and the surrounding air is 80ºF, determine the fin efficiency and the heat transfer through the fin.
What will be an ideal response?
Can classical physics be used to accurately describe a satellite moving at a speed of 7500 m/s? Explain why or why not.
A. Speed of light is 3 X 10^(8) m/s. So, 1% of the speed of light is 3 X 10^(6) m/s which is higher than 7500 m/s. The Satellite is big enough to be observable by human eyes. The gravitational force on it due to Earth which is weak. So, a satellite moving at a speed of 7500 m/s can be described accurately by Classical Physics. B. Speed of light is 3e5 m/s. So, 1% of the speed of light is 3e4 m/s which is lower than 7500 m/s. The Satellite is big enough to be observable by human eyes. The gravitational force om it due to Earth which is weak. So, a satellite moving at a speed of 7500 m/s can be described accurately by Classical Physics. C. Speed of light is 3e9 m/s. So, 1% of the speed of light is 3e7 m/s which is higher than 7500 m/s. The Satellite is big enough to be observable by human eyes. The gravitational force om it due to Earth which is weak. So, a satellite moving at a speed of 7500 m/s cannot be described accurately by Classical Physic