Consider a thin, spherical shell of radius 14.5 cm with a total charge of 28.5 µc distributed uniformly on its surface. (a) find the electric field 10.0 cm from the center of the charge distribution. (b) find the electric field 22.5 cm from the center of the charge distribution.

Cold water (cp=4180j/kg k) leadıng to a shower enters a thin-walled double-pipe heat transfer at 15c at a rate of 0.25kg/s and is heated to 45c by hot water (cp=4190j/kg k) that enters at 100c at the rate of 3kg/s. if the overall heat transfer coefficient is 950w /m2 k , determıne the rate of heat transfer and the heat transfer surface area of the heat exchanger using e - ntu method