Consider a scenario in which the flywheel described in part (a) (r1 = 1.7 m, mass m1 = 19 kg, v = 55 m/s at the rim) is spinning freely at its maximum speed, when a second flywheel of radius r2 = 2.1 m and mass m2 = 29 kg is coaxially dropped from rest onto it and sticks to it, so that they then rotate together as a single body. calculate the energy, in joules, that is now stored in the wheel.

moving ball hits still ball. mover stops, hit ball moves. momentum transfer.

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

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.