Earning the acceleration due to gravity, g, is constant at sea level on the earth's surface. however, the acceleration decreases as an object moves away from the surface due to the increase in distance from the center of the earth. derive an expression for the acceleration due to gravity at a distance h above the surface of the earth, gh. express the equation in terms of the radius of the earth re, g and h. a 70.00 kg hiker has ascended to a height of 1854 m in the process of climbing mt. washington. by what percent has the hiker's weight changed by climbing to this elevation? use g 9.807 m/s2 and re 6.371 x 10s m. (hint: keep 4 significant figures in your weight calculation to find the percent difference.) number % w change

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide

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.