Which example best represents translational kinetic energy?

a plucked string on a guitar

the moving blades of a ceiling fan

a spinning top

a tuning fork struck on a rubber block

an apple falling from a tree

The correct answer is:

An apple falling from a tree is transitional kinetic energy

Explanation:

The energy of motion of a body, according to the work it would do if it were produced to rest. The translational kinetic energy depends on motion through space, and for a determined body of regular mass is equal to the output of half the mass times the intersection of the speed. and translational (the energy due to a motion from one position to another.

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.