A frog leaps with a displacement equal to vector u and then leaps with a displacement equal to vector v, as
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Answer:
It takes <em>40 hours</em> to melt the block of ice.
Explanation:
According to the principles of radiation and heat transfer respectively:
<em>ΔQ = I(dt)eAcosθ </em>(I = Solar energy density; dt = time taken; e = emissivity; A = Area of block; θ = angle between the sun ray and the horizontal)
<em>ΔQ = mLf</em> (ΔQ = Heat change; m = mass of ice; Lf = Specific latent heat of fusion of ice)
but m = ρV = ρ.A.<em>d</em>x, therefore, the heat transfer equation can be re-written as:
<em>ΔQ = ρ.A.dx.Lf</em>
Lets equate the radiation equation and the modified heat transfer equation, we have:
<em>ρ.A.dx.Lf = I(dt)eAcosθ</em>
<em>ρ.dx.Lf = I(dt)ecosθ </em>(Striking out the area)
Let's make <em>dt</em> the subject of formula,
dt = ρ.dx.Lf /I.e.cosθ
ρ = Density of ice,
Lf =
e = 0.050
θ = 32 deg. C
Now, let's substitute the terms:
Therefore, the time taken for the ice to completely melt is <em>40 hours</em> (Two significant figures)