An iron has an aluminium plate with a mass of 1.5 kg. Calculate the thermal energy stored in the plate
when the temperature rises from 20°C to 200°C. The
specific heat capacity of aluminium is 913 J/kg°C.

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?

Where do magnetic lines of force enter earth?