A coal barge with a mass of 2.36 × 10^4 kg drifts along a river. When it passes under a coal hopper, it is loaded with 9.4 × 10^3 kg of coal. What is the speed of the unloaded barge if the barge after loading has a speed of 2.7 m/s?

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