Alight wave is shone on a glass block. at the boundary between air and glass, which wave phenomena can been demonstrated?

a) you can demonstrate reflection off the glass.
b) you can demonstrate refraction as it enters the glass.
c) you can demonstrate reflection off the glass and refraction into the glass.
d) there are no demonstrations of wave phenomena that can be shown in this example.

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .