Cuales son las propiedades de los materiales semiconductores de electricidad?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

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.

Which sound characteristic is not affected by the relative motion of an object