Question

One end of metal bar of area of cross section

5cm

25cm in length

one end is in steam other in

contact with ice, the amount of ice melts in one

minute is (Lice=80cal/gm,K=0.8cgs units )​

Answer 1

Area of cross-section of rod=5cm² =5×1-⁴m²

Length of rod=25cm=25×10-²m

Thermal conductivity, K=30W/mK

L=80cal/gm

∆Q = ∆tetha =

∆t l →100

KA

= 100

25×10-²

30×5×10-⁴

=6J/s

for 1 min

∆Q=360J

m×80×4.2=360

m=1.07g

here the answer

Answer 2

Answer:

1.078

Explanation:

area of cross section of road 5cm^2=5×10 ^(-4)m^2

length of road =25cm=25×10^2

thermal conductivity, k=30w

L=80cal/gm

deltaQ=delta theta

deltaT=1/KA=100

100/25×10^(-2)/30×5×10^(-4)

=6Js

for 1minutes

deltaQ=360J

m×80×4.2=360

m=1.078

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