Find the length of a pendulum that oscillates with a frequency of 0.15 hz.

The 'period' of a simple pendulum is

Time = 2 π · √ (pendulum's length) / (acceleration of gravity)

Time = 1/frequency = 6.67 seconds

g = 9.81 m/s²

Stuff those numbers into the formula, and you get

Pendulum's length = 11.04 meters

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

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.