Water's heat of fusion is 80. cal/g , and its specific heat is 1.0calg⋅∘c . some velomobile seats have been designed to hold ice packs inside their cushions. if you started a ride with ice packs that held 1900 g of frozen water at 0 ∘c , and the temperature of the water at the end of the ride was 32 ∘c , how many calories of heat energy were absorbed?

212800 cal

Explanation:

we have to find the total heat absorbed

we have given tha

latent heat of fusion = 80 cal/g

mass of frozen water =1900 g

heat absorbed during fusion

no heat absorbed during temperature rise from 0°Ct  to 32°C

so total heat absorbed =152000+60800=212800 cal

answer: a. same unit

explanation:

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.