The pacific plate collides with and is subducted under four other crustal plates. the area where this happens has lots of volcanic activity. this area is called the
ring of volcanoes
ring of fire
bermuda triangle
ring of heat

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.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?