Which of the following radiations has the greatest frequency?
a. Infrared
b. Visible
c. Ultraviolet
d. X-rays
d
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Time Dilation: A spaceship carrying a light clock moves at a speed of 0.960c relative to an observer on Earth. If the clock on the ship advances by 1.00 s as measured by the space travelers aboard the ship, how long did that advance take as measured by the observer on Earth?
A. 0.96 s B. 1.2 s C. 2.6 s D. 3.6 s E. 5.8 s
With increasing emphasis on energy conservation, the heat loss from buildings has become a major concern. For a small tract house the typical exterior surface areas and R-factors (area ? thermal resistance) are listed below
(a) Calculate the rate of heat loss from the house when the interior temperature is 22°C
and the exterior is –5°C.
(b) Suggest ways and means to reduce the heat loss and show quantitatively the effect
of doubling the wall insulation and the substituting double glazed windows (thermal
resistance = 0.2 m2 K/W) for the single glazed type in the table above.
GIVEN
• Small house
• Areas and thermal resistances shown in the table above
• Interior temperature = 22°C
• Exterior temperature = –5°C
FIND
(a) Heat loss from the house (qa) (b) Heat loss from the house with doubled wall insulation and double glazed windows (qb). Suggest
improvements.
ASSUMPTIONS
• All heat transfer can be treated as one dimensional
• Steady state has been reached
• The temperatures given are wall surface temperatures
• Infiltration is negligible
• The exterior temperature of the floor is the same as the rest of the house
What is the principal evidence that new plate material is continually being formed?
What will be an ideal response?
What are black dwarfs?
A) The lowest mass main sequence stars B) The end result of massive star evolution C) Objects that are not quite massive enough to be stars D) Pulsars that have slowed down and stopped spinning E) Cooled off white dwarfs that no longer glow visibly