When 180 joules of work is done to push a box horizontally 15.3 meters, how much force is applied?
•2,754 joules
•2.754 newtons
•11.76 newtons
•11.76 joules

11.76Newtons

Explanation:

Workdone = Force * distance

Given

Workdone = 180joules

Distance = 15.3 metres

Required

Force

From the formula;

Force - Work/distance

Force = 180/15.3

Force = 11.76Newtons

Hence the required force is 11.76Newtons

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.

the maxium height is 34m/s