A beam of light traveling through air strikes a block of clear acrylic at an angle of 29° to the normal. At what angle
does the light enter the block of clear acrylic?

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s