A simple pendulum is 8.00 m long. (a) What is the period of small oscillations for this pendulum if it is located in an elevator accelerating upward at 7.00 m/s2? s
(b) What is the period of small oscillations for this pendulum if it is located in an elevator accelerating downward at 7.00 m/s2? s
(c) What is the period of this pendulum if it is placed in a truck that is accelerating horizontally at 7.00 m/s2? s

3.2x10^7

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 components of a vector are the parts of the vectors that are to each other.

b perpendicular