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the strip is w wide, h high and l very long
By substituting T=T(m)+A(s)exp(-z/d)sin[(2pi/P)(t-t(m))] intodT/dt=(d/dz)[(k/C(s))(dT/dz)]=(d/dz)[a(h)(dT/dz)], verify that theformer is a solution of Fourier's equation of heat conductionthrough a homogenous soil medium, and then, derive the expressionfor the ground heat flux.T(m)-->the mean temperature of the surfaceA(s)-->amplitudeP-->periodt(m)--> the time when T(s)=T(m)
A charge q that moves between two points A and B, and has anelectric force acting on it ( and perhaps several other forces) haswork W done on it by the electric force. The electrostatic force isconservative and so we can define a change in electric potentialenergy, Delta U = -W. We defined electric field using the relationF^^\-> = q E^^\->, and in a similar way we define electricpotential commonly called voltage asDelta V = V_B - V_A = -W/q=(Delta U)/q or equivalently q Delta V =q (V_B - V_A) = -W=Delta UA ball has mass 3.0 µg and charge -6 nC moves from point A to pointB. It has the same speed at points A and B, and the work done bythe electric field during the move is -1.5 mJ.(a) What is the change in electric potential energy of the ball?1(b) What is the change in voltage between points A and B? 2(c) At which point does the ball have a higher electric potentialenergy?(d) Which point has the higher voltage?(e) Has the kinetic energy of the ball changed?