A sphere has a ______surface.

Write (T) for True and (F) for false: (v) A sphere has a curved surface.

A copper sphere has a surface area of 3.142 xx 10^-2m^2 and its emissivity is 0.018. Find the energy lost by the sphere per second when its temperature is 100^@C . ( sigma = 5.67 xx 10^-8 W/m^2k^4 .)

A sphere has surface charge density sigma . It is surrounded by a spherical shell. The surface charge density on the spherical shell is

A sphere has a concentric spherical cavity. The specific gravity of the material of the sphere is 8. the sphere is place on a surface of water. If in the equilibrium position the sphere just sinks in water, the ratio of theradius of cavity to the outer radius of the sphere is

A cylinder and a hollow sphere are placed on a surface. If the height of the cylinder is equal to the diameter of the sphere, what is the ratio of the heights of centre of gravity of the cylinder and the sphere from the surfaced?

A right circular cylinder circumscribes a sphere of radius r.Find the ratio of the surface area of the sphere to the curved surface area of the cylinder.

A sphere has the same curved surface area as a cone of height 40 cm and radius 30 cm. The radius of the sphere is

A sphere has the same curved surface as a cone of height 12 cm and base radius 5 cm. Find the radius to the nearest cm .