Aluminium melt at 658°C and has specific heat of 910j/kg/K and specific latent heat of 393000j/kg. 42900000 of heat is supplied to 50 kg aluminium initially at 25°C. how much of aluminium remains as solid?

c because the action was the roller coaster reaches bottom of hill (action) reaction would be blood tends to drain away from head

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i think the answer is a and b

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speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.