An opera singer in a convertible sings a note at 700 Hz while cruising down the highway at 90 km/h . The speed of sound in the air is 343 m/s. 1. What is the frequency heard by a person standing beside the road in front of the car?
2. What is the frequency heard by a person standing beside the road behind the car?

What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force

A100 kg running back runs at 5m/s into a stationary linebacker. it takes 0.5 for the running back to be completely stopped

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?