Questions
Ice starts forming on the surface of the lake and takes 8 hrs to form a layer of 11 cm thick. How much time will it take to increase the thickness of layer by 2 cm further?
detailed solution
Correct option is D
time required to form x thickness of ice is t=ρL2Kθ(x22-x12 ) here ρ is density of ice; L is latent heat of fusion of ice; K is coefficient of thermal conductivity; θ is temperature of atmosphere t α (x22-x12 ) t1=8 hours; x1=0cm;x2=0cm;x3=13cm t2=? t1t2=(x22-x12 )(x32-x22 ) 8t2=112-02132-112 t2=8 x 48121=3.17 hourTalk to our academic expert!
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A copper rod is joined to a steel rod in series. The rods have equal length and equal cross – sectional area. The free end of copper rod is kept at 10°C and that of steel rod is kept at 100°C. If the thermal conductivity of copper is eight times that of steel, what is the temperature at the junction of the rods ?
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