How long does it take the sun to melt a block of ice at 0∘c with a flat horizontal area 1.0 m2 and thickness 1.8 cm ? assume tha
t the sun's rays make an angle of 33 ∘ with the vertical and that the emissivity of ice is 0.050.how long does it take the sun to melt a block of ice at 0∘c with a flat horizontal area 1.0 m2 and thickness 1.8 cm ? assume that the sun's rays make an angle of 33 ∘ with the vertical and that the emissivity of ice is 0.050?
This is a problem involving heat transfer through radiation. The solution to this problem would be to use the formula for heat flux.
ΔQ/Δt = (1000 W/m²)∈Acosθ
A is the total surface area: A = (1 m²) + 4(1.8 cm)(1m/100 cm)(√(1 m²)) A = 1.072 m²
ΔQ is the heat of melting ice. ΔQ = mΔHfus Let's find its mass knowing that the density of ice is 916.7 kg/m³. ΔQ = (916.7 kg/m³)(1 m²)(1.8 cm)(1m/100 cm)(<span>333,550 J/kg) </span>ΔQ = 5,503,780 J
5,503,780 J/Δt = (1000 W/m²)(0.05)(1.072 m²)(cos 33°) <em>Δt = 122,434.691 s or 34 hours</em>
