An air-filled parallel-plate capacitor is constructed with a plate area of 0.40 m2 and a plate separation of 0.10 mm
It is then charged to a potential difference of 12 V? (?0 = 8.85 × 10-12 C2/N ? m2 )
(a) How much charge is stored on each of its plates?
(b) How much energy is stored in it?
(a) 0.42 µC (b) 2.5 µJ
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Determine the effect of forced convection on heat transfer from an incandescent lamp. What would be the glass temperature be for air velocities of 0.5, 1, 2, and 4 m/s?
GIVEN
• A spherical glass light bulb in air
• Bulb power consumption (P) = 100 W
• 10% of energy is in the form of visible light
• Diameter (D) = 10 cm = 0.1 m
• Bulb emissivity (?) = 0.85
• Ambient air temperature (T?) = 20°C = 293 K FIND
• The glass temperature (Ts) for air velocities (U?) of 0.5, 1, 2, and 4 m/s ASSUMPTIONS
• The bulb has reached steady state
• The surrounding behave as a black body at T?
SKETCH
PROPERTIES AND CONSTANTS
Thermal conductivity (k) = 0.025 W/(m K)
Kinematic viscosity (?) = 15.7 × 10–6 m2/s
Prandtl number (Pr) = 0.71
The composition of Earth's atmosphere today is about 78% ________, 21% ________, and about 1% ________, with trace amounts of other gases.
A. nitrogen; carbon dioxide; oxygen B. nitrogen; oxygen; argon C. nitrogen; oxygen; carbon dioxide D. oxygen; nitrogen; water vapor E. oxygen; carbon dioxide; nitrogen
A constant volume and mass of helium gas at 77°C is heated so that the pressure of the gas doubles. What is the new temperature of the gas in Celsius degrees?
a. 154°C b. 273°C c. 427°C d. 700°C
Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter that decays into photons or other forms of energy about 50 billion years from now
Based on current understanding, how would that affect the universe at that time? A) Stars would cease to exist when the dark matter is gone. B) Planetary systems would expand and disperse. C) The galaxies in clusters would begin to fly apart. D) The universe would cease its expansion.