In one amusement park ride, riders enter a large vertical barrel and stand against the wall on its horizontal floor. the barrel is spun up and the floor drops away. riders feel as if they are pinned to the wall by a force something like the gravitational force. this is a fictitious force sensed and used by the riders to explain events in the rotating frame of reference of the barrel. explain in an inertial frame of reference (earth is nearly one) what pins the riders to the wall, and identify all of the real forces acting on them.

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )

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.