Answer to Question #264620 in Physics for jay

Question

Questions 3 – 5 refer to the diagram below, which shows composite bars made from sections of

two metals, P and Q, of conductivities of 400 W m -1 K -1 and 200 W m -1 K -1 respectively. P and Q

are both of cross-sectional area 1.00 X 10 -2 m 2 . The structures are perfectly lagged and a

temperature difference of 40 K is set up across their lengths.

40 K

40 K P

P Q Q

50.0 cm 50.0 cm 50.0 cm

Q3. What is the rate of heat flow under steady state conditions with P and Q in series?

A) 107 W

B) 120 W

C) 480 W

D) 240 W

Note that the effective k for a series composite of two slabs, k series = k 1 k 2 / (k 1 + k 2 )

Q4. What is the rate of heat flow under steady state conditions with P and Q in parallel?

A) 120 W

B) 480 W

C) 240 W

D) 107 W

Note that the effective k for a parallel composite of two slabs, k parallel = k 1 + k 2

Answer 1

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