Select all that apply.

which of the following is true about acids?

a: most acids are sour.
b: most acids corrode metals.
c: every acid contains hydrogen.
d: the hydrogen ion in all acids has a negative charge

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Anybody wanna ? (picture included? )

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.