In CSS, the lowest priority is default styles specified by the browser.
Answer the following statement true (T) or false (F)
True
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Stars much less luminous than the Sun have
A) wider habitable zones, increasing the odds of finding habitable planets and much longer lifetimes allowing life to appear and evolve B) wider habitable zones, increasing the odds of finding habitable planets but lifetimes too short for life to appear C) narrower habitable zones, decreasing the odds of finding habitable planets and lifetimes too short for life to appear D) narrower habitable zones, decreasing the odds of finding habitable planets but much longer lifetimes allowing life to appear and evolve
Grandfather clocks often are built so that each one-way swing of the pendulum is a second. How long is the length of a simple pendulum for a 2.00 second period?
A) 0.993 m B) 24.8 cm C) 101.cm D) 0.500 m E) 500. cm
Light travels from outside a building to inside through a pane of glass. Which of the following is true regarding the phase change upon reflection in the case?
a. No phase change occurs at either the inside surface or the outside surface of the glass. b. A 180o phase change occurs at both the inside surface and the outside surface. c. A 180o phase change occurs at the inside surface but not at the outside surface. d. A 180o phase change occurs at the outside surface but not at the inside surface.
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)