7. A 4kg cart traveling 3m/s South collides with a 6kg cart travelling 4 m/s North. After the collision, the 4kg cart is
travelling North at a speed of 2m/s.
•What is the speed of the 6kg cart after the collision?
•What is the change in momentum experienced by the 6kg
cart?
•If the collision lasted 0.3s, how much force did the 6 kg cart
experience?

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Disney, viacom and aol time warner are examples of

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.