A monochromatic ray of light (f = 5.09 x 1014 Hz) travels from air into medium X. The angle of incidence of the ray in air is 45.0° and the ray's angle of refraction in medium X is 29.0°. Calculate the absolute index of refraction of medium X. [Show all work, including the equation and substitution with units.] ​

An ideal spring has a spring constant (force constant) of 2500 n/m, is stretched 4.0 cm, how much elastic potential energy does it possess? (a) 3j (b) 0.00j (c) 1j (d) 2j (e) 4j

The total amount of energy contained in an object

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 .