12. If the distance an object travels and the time it takes to travel the distance are known, which of the following can be calculated? А Average speed B Average acceleration С Instantaneous speed Instantaneous acceleration​

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4πε 0 = 8.99 × 109 n · m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to