A laptop computer consumes an average power of 34 W. The rechargeable battery has a voltage of 26 V, and capacity of 5800 mAh. How long can the laptop run on a single battery charge

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