Which dog has the most kinetic energy? A. A dog of mass 11 kg running with speed 5 m/s
B. A dog of mass 13 kg running with speed 3 m/s
C. A dog of mass 14 kg running with speed 2 m/s
D. A dog of mass 12 kg running with speed 4 m/s

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.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

Truck traveling west on the highway experiences an acceleration to the east. what could be the cause of this acceleration