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

Physics & Space Science

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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

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Which statements about the magnetic fields of Uranus and Neptune is FALSE?

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The rotation curve for our Galaxy shows stars beyond the Sun moving more slowly than expected

Indicate whether the statement is true or false

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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

Physics & Space Science