24. [2pt] A 1.40 m by 2.00 m slab of steel is heated on one side to 560 deg. C.
ID: 1519609 • Letter: 2
Question
24. [2pt] A 1.40 m by 2.00 m slab of steel is heated on one side to 560 deg. C. If the steel slab is 1.90 cm thick and the other side is at a temperature of 29 deg. C, what is the rate of heat transfer through the steel? Answer: Last Answer: 3.928E+06 W Not yet correct, tries 1/20
26. [2pt]
Two current carrying wires, with currents 2.0 A and -1.0 A respectively, lie 30.0 cm apart. Calculate the force acting on a 12.0 cm long piece of the second wire, taking an attractive force as being negative.
Answer: Last Answer: 13.33E-07 N/m
Not yet correct, tries 0/20
Explanation / Answer
24) Rate = k•A•(T1 - T2)/d
= 50.2*1.4*2.0*(833 - 302)/0.019 = 3.93*10^6 W (Answer depends on thermal conductivity of Steel what type of steel here is used i.e. stainless steel, steel carbon etc.)
26) Force = F = (uo*I1*I2*L)/(2pi*d) = (2*10^-7*2*1*0.12)/0.30 = 1.6*10^-7 N
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