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Potential φ() a −φ(b) =− ∫E ds b ⋅ Energy of E The energy of an electrostatic configuration U = 1 1 2 2 ∫ V ρφdV = 8π∫ E dV Pressure A layer of surface charge density σ exerts a pressure P = 2πσ 2 G G Current density J =ρv GG Current I = dQ dt / = ∫J da ⋅(4 ed) 73 A block of mass m hangs on the end of a cord and is connected to a block of mass M by the pulley arrangement shown in Figure P741 Using energy considerations, (a) find an expression for the speed of m as a function of the distance it has fallen Assume that the blocks are initially at rest and there is no frictionALL 40% OFF 5 for $79; Boulder Mono Formist Foundry Žá‚Œ©‚¦‚é 40'ã "¯Œ^ ƒVƒ‡[ƒg –Ê'·
