The Young's modulus for steel is much more than that for rubber. For the same longitudinal strain, which one will have greater tensile stress?

Steel is more elastic than rubber. Explain why?

Two spheres of the same radii, one solid and other hollow are charged to the same potential, which one has greater charge?

A toaster produces more heat than a light bulb when they are connected in parallel. Which has the greater resistance.

Define Young's modulus of elasticitiy. normal stress and longitudinal strain. Give unit of each of them. Derive an expression for the elastic potential energy of a wire, when stretched.

A light and a heavy body have same linear momentum. Which one has greater K.E.?

Electron and proton are moving with the same speed, which will have more wavelength?