Chewing surface of the teeth made of _

Look at the pictures given below and answer the questions that follow : 1. Are the teeth of animals similar to ours ? 2. How is the shape of their teeth related to their food habit ?

A convex lens is made of a material having refractive index 1.2. Both the surface of the lens are convex. If it is dipped into water (mu=1.33) it will behave like

A toy is made in the form of hemisphere sumounted by a right cone whose circular base is joined with the plane surface of the hemisphere . The radius of the base of the cone is 7 cm and its volume is 3/2 of the hemisphere . Calculate the height of the cone and the surface area of the toy correct to 2 places of decimal (Take pi= 3 1/7 )

A hemispherical bowl of radius R is set rotating about its axis of symmetry which is kept vertical. A small block kept in the bowl rotates with the bowl without slipping on its surface. If the surfaces of the bowl is smooth, and the angel made by the radius through the block with the vertical is theta , find the angular speed at which the bowl is rotating.

Determine the focal length of the lens made up of a material of refractive index 1.52 as shown in the diagram. ( Points C_(1) and C_(2) are the centers of curvature of the first and second surface).

Write a note on the teeth of rabbit.

Plague formed on the teeth are mineral salts of ............... .

When two surface are polished, the friction coefficient between them decreases. But the friction coefficient increases and becomes very large if the surfaces are made highly smooth. Explain.

The deposition of calcium and magnesium salts on the teeth forms a hard layer called ………..

A double convex lens is to be made of glass with refractive index. 1.5 One surface is to have twice the radius of curvature of the other surface and focal length is to be 60 mm. What are the radii ?