A rock is thrown off a 70 m high cliff with an initial speed of 5 m/s. How far from the base of the cliff will the rock hit the water? (5 points)
A. - 25.4 m
B. - 18.5 m
C. - 7.9 m
D. -13.8 m

Natural forces that can alter ecosystems include seasons and climate changes. t or f

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 summit of chimborazo, in ecuador, which is at a distance of about 6,384 km from the earth’s center. the bottom of the mariana trench, in the western pacific ocean, which is nearly 6,370 km from the center of the earth. on the surface of earth on the equator line.