A ray of light in diamond (index of refraction 2.42) is incident on an interface with water. What is the largest angle the incident ray can make with the normal in diamond and not be totally reflected back into the diamond?

You are your friend move a new refrigerator into his kitchen. you apply a horizontal force of 252 n in the negative x direction to try and move the 56 kg refrigerator. the coefficient of static friction is 0.61. (a) how much static frictional force does the floor exert on the refrigerator? give both magnitude (in n) and direction. magnitude n direction (b) what maximum force (in n) do you need to apply before the refrigerator starts to move?