Pythagoras proposed that all nature was underlain by musical principles, by which he meant _______________
Fill in the blank(s) with correct word
mathematics
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If the house is electrically heated at a cost of $0.06/(kW hr), estimate the savings achieved with a double-pane compared to a single-pane window during December.
Determine the rate of heat loss through a double paned window, as shown in the sketch,
if the inside room temperature is 65°C and the average outside air is 0°C during
December. Neglect the effect of the window frame.
GIVEN
• A double-paned window as shown
• Inside room temperature (T?i) = 65°C
• Outside air temperature (T?o) = 0°C
• Cost of heating = $0.06/(kW hr)
FIND
(a) The rate of heat loss through a double paned window (b) The saving of double paning over single paning
ASSUMPTIONS
• Saving can be based on steady state analysis
• Inside and outside air is still
• Radiative heat transfer is negligible
PROPERTIES AND CONSTANTS
thermal conductivity of window glass (kg) = 0.81 W/(m K)
Compared to the Milky Way, how many stars are contained in the most massive galaxies?
A) two to three times as many B) tens of times as many C) hundreds of times as many D) thousands of times as many E) millions of times as many
Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel prize in physics for their development of __________
Fill in the blank(s) with correct word
The energy level diagram for hydrogen
The smallest energy of an absorbed photon that will raise a hydrogen atom from its ground state to its first excited state is
a.
1.5 eV.
b.
1.9 eV.
c.
3.4 eV.
d.
10.2 eV.
e.
13.6 eV.