How long does it take a train accelerating from 25.4 m/s to 81.2 m/s to cover 2130
m?

What produces a record of seismic waves? richter scale seismogram barometer seismograph

Apiano tuner uses a tuner to create a tone of 5.00 x 10² hz. when a key on the piano is struck he hears 5 beats per second. what is a possible frequency of vibration for the piano string? 2500 hz 1300 hz 605 hz 495 hz

What are chlorofluorocarbons and what impact do they have on the atmosphere?