An optical fiber is made of glass iwth an index of refraction of 1.24. Assuming the fiber is surrounded by air, for what minimum angle of incidence (in radians) will light remain in the fiber

ice to water 1 water to vapour 2 latent heat

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.