A thick-walled metal pipe of length 20.0 cm has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the pipe, counting the ends, in square centimeters?
A) 276 cm2
B) 277 cm2
C) 278 cm2
D) 279 cm2
Question 2
If, with steady state heat flow established, you double the thickness of a wall built from solid uniform material, the rate of heat loss for a given temperature difference across the thickness will
A) become one-half its original value.
B) also double.
C) become one-fourth its original value.
D) become 1/ of its original value.
E) become four times its original value.
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