A car travels 20 Km north. It then turns around and travels 15 Km south. what is the resultant displacement and distance covered by the car ?

Wo audio speakers are placed on a vertical rail. speaker a is placed at head-level while speaker b is place at some variable height, \delta yδy, above speaker a. both speakers receive simultaneous input from a sine-wave generator so the speakers each produce a pure sinusoidal sound wave with a wavelength of 0.531 meters. calculate the lowest height that speaker b can be placed above speaker a to produce a minimum of sound heard by person standing \delta x = 7.86δx=7.86 meters directly in front of speaker a.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

If a simple machine reduces the strength of a force, what must be increased?