Find the speed of a wave with wave length 650 M and a frequency 35HZ

help.

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Atruck driver is attempting to deliver some furniture. first, he travels 8 km east, and then he turns around and travels 3 km west. finally, he turns again and travels 13 km to his destination. what is the drivers total displacement?