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Author Question: Materials A, B, and C have R values of 1, 4, and 8 ft2-F-hr/Btu, respectively. If the rate of heat ... (Read 33 times)

magmichele12

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on: Jul 28, 2018
Materials A, B, and C have R values of 1, 4, and 8 ft2-F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____.
 a. 1.5 b. 2.5 c. 4.0 d. 7.0 e. 80 Btu/hr

Question 2

A tennis player standing 12.6 m from the net hits the ball at 3.00 above the horizontal. To clear the net, the ball must rise at least 0.330 m. If the ball just clears the net at the apex of its trajectory, how fast was the ball moving when it left the racket?


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kbennett34

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Reply #1 on: Jul 28, 2018
Answer to Question 1

a

Answer to Question 2

48.6 m/s


magmichele12

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Reply 2 on: Jul 28, 2018
Great answer, keep it coming :)

patma1981

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Reply 3 on: Yesterday
Gracias!

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