what is the work done on a 34-n weight if it is lifted up 1 km?
a.
17 j
b.
34 j
c. 0.034 j
d.
34,000 j

34,000J (or 34 kJ)

Explanation:

Work is F•D. Assuming we're neglecting any odd angles, possible work done by whatever is pulling it up, and that it is pulled up with a force equal to its weight:

Work = (34N)(1000m) = 34,000J

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.

u

explanation: