Problem5 (5 pts): the heating of home to increase its temperature must be modeled as an open system, because expansion of the household air at constant pressure results in leakage of air to outdoors. assuming that the molar properties of air leaving the home are the same as those of air in the home, show that energy and mole balances yield the following differential equation: dn du where q is the rate of heat transfer to the air in the home, and t is the time. quantities p, v, n, and u refer to the air in the home.

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.

3. dark matter

empty space could also be a simple vacuum

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.