Calculate the amount of heat that must be removed from an 400-g block of aluminum to lower its temperature from 160°C to 40°C. The specific heat capacity of aluminum is 0.215 cal/g·°C.

Ahuge (essentially infinite) horizontal nonconducting sheet 10.0 cm thick has charge uniformly spread over both faces. the upper face carries +95.0 nc/m2 while the lower face carries -25.0 nc/ m2. what is the magnitude of the electric field at a point within the sheet 2.00 cm below the upper face? (ε0 = 8.85 × 10-12 c2/n · m2)