A“flying pig” toy is suspended by a 0.50-m–long light string, and flaps its wings to travel in a clockwise circular path (as viewed from above). the string makes an angle of 30º with the toy’s vertical axis of rotation, and the pig has a mass of 2.0 kg. (a) what is the tension in the string? (b) what is the angular momentum of the pig about the vertical axis of rotation?

c. newton's third law of motion

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.