A 35 kg sledder slides down from the top of a 5.9 m tall hill. The sledder starts with a speed of 2.63 m/s. a) What is the sledder's speed at the bottom of the hill?

b) At the bottom of the hill, the sledder collides with a 50 kg person running at 8.5 m/s directly away from the sledder. You can assume both the sledder and the person are moving due east. The sledder and the person collide and the person falls into the sled. What is the velocity of the sledder and the person after the collision?

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.