Một chất điểm dao động điều hoà theo phương trình x = 5cos(2πt)cm, chu kì dao động của chất điểm là
A. 1s. B. 2s. C. 0,5s. D. 10s.

Avoltaic cell converts chemical energy to

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.

What happens to the vapor pressure of a substance when its surface area is increased at constant temperature?