A slab of concrete and an insulating board are in thermal contact with each other. The temperatures of their outer surfaces are 68°F and 50°F. Determine the rate of heat transfer (in BTU/ft2/h) if the R values are 1.93 and 8.7 ft2/°F/h/BTU, respectively
a. 9.7
b. 2.5
c. 5.3
d. 1.7
e. 28
d
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Each box in this figure represents a different level of structure in our universe. Each box is labeled with one of the numbers 1—5. Which box represents the Milky Way Galaxy?
A) 1 B) 2 C) 3 D) 4 E) 5
Which statements about the magnetic fields of Uranus and Neptune is FALSE?
A) Neither fits the Dynamo model very well. B) Uranus' field is tilted 60 degrees off its already tilted rotational axis. C) Neptune's field is tilted 47 degrees to its more conventional rotational axis. D) Both pass directly through the cores of their planets, like all other fields. E) Both may have ammonia water replacing the liquid metallic hydrogen.
The rotation curve for our Galaxy shows stars beyond the Sun moving more slowly than expected
Indicate whether the statement is true or false
A 100-g block of copper is taken from a kiln and quickly placed into a beaker of negligible heat capacity containing 300 g of water. The water temperature rises from 15°C to 40°C. Given cCu = 0.10 cal/g•°C, and cwater = 1.00 cal/g•°C, what was the temperature of the kiln?
a. 500°C c. 790°C b. 635°C d. 535°C