A rectangular plate of metal has length = 6.712 m, breadth = 2.13 m and thickness = 0.301 m. Find the surface area of its face and it volume.

A rectangular lamina has a length =(6.9+-0.2)cm and a breadth b=2.3+-0.1)cm . Find the area of a lamina.

A rectangular brass plate of sides 15 cm and 8cm and thickness 0.8cm has it's opposite faces maintained at 373 K and 343 K respectively. How much heat will flow through the plate per minute? K for brass = 109.2 W/mK.

Rectangular film of soap solution having length 3cm and width 2cm is produced . Find the workdone if surface tension of soap solution is 0.04N/m.

Metal slab is made up of two parallel side plates of metal A and metal B of thickness 0.6 cm and 0.4 cm respectively. Their respective thermal conductivities are 2.268 and 1.008 SI unit. The outer surface of the plate A is at 220^@ and that of plate B at 20^@ . Find the temperature of the interface .