The hubble constant is about 70 km/s/mpc 70 km/s/mpc , which means that a galaxy traveling at 2100 km/s 2100 km/s away from the milky way is about 30 mpc away. messier 77 this spiral galaxy is traveling away from the milky way at about 1140 km/s 1140 km/s and is about 14 mpc 14 mpc away. what would the velocity of the milky way be as seen from such a galaxy

The mantle is made up of which structural zones?

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.

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?