Question 14 of 14 a Sapling Learning As a coffee enthusiast you wish to keep you

Question

Question 14 of 14 a Sapling Learning As a coffee enthusiast you wish to keep your ooffe as hot as possible for as long as possible. You wish to find the rate of heat loss of a typical coffee mug. Assume the mug to be a which has a lid made out of the same m aterial ast e restof the cylinder. ard the thickres of vais s 1.17 on.ir the cofion conduction than from radiated energy. See the hint below for important constants and the room terrperature is 24.0 C how much more heat does the mug lose through Number The mug loses heat by conduction mes more quickly than by radiation Tools Hin Assume that the thermal conductivity of all sides of the mug is o.850 wm C that the mug has an emissivity of to include all surfaces of the mug convert all units and to search

Explanation / Answer

Heat lost during conduction,

Pc = Q/T = kA dt/dx

Pc/A = 0.85 x (81.3 - 24)/0.0117 = 4162.82 W/m^2

Heat lost by radiation,

Pr/A = 0.775 x 5.67 x 10^-8((354.3)^4 - (297)^4) = 350.51 W/m^2

Pc/Pr = 4162.82/350.51 = 11.88 (Ans)

I can't see the power of 10 in the box. Convert accordingly.

Comment in case any doubt please rate my answer....

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.