The wavelength of a sound wave is 30 m. The frequency is 7 Hz. What is the wave speed? 210 m/s

4.29 m/s

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.

Suppose a wheel with a tire mounted on it is rotating at the constant rate of 2.15 times a second. a tack is stuck in the tire at a distance of 0.373 m from the rotation axis. noting that for every rotation the tack travels one circumference (a) find the tack's tangential speed. (b) what is the tacks radial acceleration?

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