Alead block of mass 6.6 kg is originally at a temperature of 26°c and 1 atm. it is then heated to a temperature of 68°c without any change in pressure. the specific heat of lead is 128 j/(kg.°c), its density is 1.13 104 kg/m^3, and the coefficient of linear expansion is 29 ✕ 10^−6 /°c. (a) determine the work done by the lead block.
(b) how much heat energy is transferred during this process?
(c) what is the increase in internal energy of the system?

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp,max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?