An elevator is rising at a constant speed. what forces are acting on the elevator? a. gravity b. air resistance c. gravity and air resistance d. gravity, air resistance, and normal force

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.

Hydrogen and helium are both members of?

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?