Aperson who eats 3040 cal each day consumes 1.27254 × 107 j of energy in a day. how much water at 100◦c could that much energy vaporize? the latent heat of vaporization of water is 2.26 × 106 j/

5.63 gram

Explanation:

As per the equation

Q = Lm

where Q is the amount of heat needed to convert water in to vapour

and L is the latent heat f vaporization.

m is the mass converted, hence putting all the values.

m =Q/L

   =  12725400/ 2260000

   = 5.63 gram

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

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.