A train A travelled a distance of 150 km in 3 hours, whereas, train 'B" travelled a distance of 180 km in 4 hours. Which train travelled faster?​

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude