A train has mass 250000 kg. Its motor accelerates the train to 25 m/s from a standing start in 45 seconds. The motor's power rating is 2.75 MW. How efficient is the motor?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.

What ions are formed when hcl dissolves in water?