Calculate the solid angle subtended by the periphery of an area of `1cm^2` at a point situated symmetrically at a distance of 5 cm from the area.

Find the surface area of the sphere of radius: 5 cm?

Calculate the length of the arc of a circle of radius 31.0 cm which subtends an angle of pi/6 at the centre.

The surface area of a sphere is 346.5cm^2 . Find its radius.

Calculate the conductivity of a wire of length 200 cm, area of cross-section 2cm^2 and of resistane 5xx10^4Omega .

Find the area of a triangle whose base is 5 cm and altitude 4 cm.

The length of a rectangle is 7.1 cm and its breadth is 2.5 cm. What is the area of the rectangle?

The resistance of a 0.5M solution of an electrolyte was found to be 30Omega . Calculate the molar conductivity of the solution if the electrods in the cell are 1.5 cm a part and having an area of cross section is 2.0 cm^(2) .