A new electric power plant has an efficiency of 42%. For every 100 barrels of oil needed to run the turbine, how many are essentially lost as waste heat (in barrels of oil) to the environment?
a. 21
b. 42
c. 58
d. 10
e. 79
c
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A 0.61 m radius hemisphere (811 K surface temperature) is filled with a gas mixture containing 6.67 % CO2 and water vapor at 0.5 % relative humidity at 533 K and 2-atm pressure. Determine the emissivity and absorptivity of the gas, and the net rate of radiant heat flow to the gas.
GIVEN
A hemisphere filled with a gas mixture
Hemisphere radius (r) = 0.61 m
Hemisphere surface temperature (T1) = 811 K
Gas temperature (Tm) = 533 K
Gas pressure (pT) = 2 atm
Gas mixture: 6.67% of CO2 and water vapor at R.H. = 0.5%
FIND
(a) The emissivity (?m) and absorptivity (?m) of the gas
(b) The net rate of radiant heat flow to the gas (q1–m)
ASSUMPTIONS
The hemisphere surface is black (?1 = 1)
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant
the saturation pressure of water at 533
A negative charge, if free, tries to move
A) from high potential to low potential. B) from low potential to high potential. C) toward infinity. D) away from infinity. E) in the direction of the electric field.
When the ______________ is crossed traveling westward, the date is advanced to the next day
Fill in the blank(s) with correct word
Size of the Nucleus: A proton is projected at a stationary 
Ra aluminum target. The proton momentarily comes to a halt at a distance from the center of an aluminum nucleus, equal to twice the nuclear radius. Assume that the nucleus retains its spherical shape and that the nuclear force on the proton is negligible. The initial kinetic energy of the proton, in MeV, is closest to:
A. 8.7 MeV. B. 5.8 MeV. C. 2.9 MeV. D. 13 MeV. E. 17 MeV.