Which of the following is true about the Earth's tilt? a. The Sun changes its angle throughout the year by 23.5° causing the seasons to change. b. The Earth is tilted 23.5° causing the length of days to change during the Earth's 24-hour rotation.
c. The Earth tilts back and forth like a top 23.5° every 365 days, causing the length of days to change.​

Suppose while hauling rocks, you accidentally drop one. it breaks apart in flat, planar sections. what type of rock did you just drop? 20 points

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.

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?