A ray of light moving in a sample of flint glass(n=1.70) crosses a boundary and speeds up to 2.999x10^8 m/s as it enters air (n=1.0003). How fast does light move in flint glass?

Sound waves are mechanical waves in which the particles in the medium vibrate ina direction parrallel to the direction of energy transport. what is another name of the type of wave that transfers energy in this way?

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

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?