How fast is lightening

If you want to change the pitch of a sound, you have to change the

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car