When the light beam passes from the first environment (air) to the second, the angle of incidence is 60 ° and the angle of refraction is 30 °. What is the refractive index of the second in relation to the first? sin 30 ° = 1/2,.

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 .