An ideal material for making cooking vessels must have

Why should the material used for making permanent magnet have high coercivity?

Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted in 20 min. and 40 min respectively. The ratio of their thermal conductivity is

A fez,the cap used by the Turks,is shaped like the frustum of a cone (seeFig)If its radius on the open side is 10 cm,radius at the upper base is 4 cm and its slant height is 15 cm,find the area of material used for making it.

What is meant by hysteresis loop? What type of magnetic material is used in making permanent magnets?

The following four wires are made of the same material. Which of these will have the largest extension when the same tension is applied ? L is the length and D is the diameter.

A man walking briskly in, rain with speed v must slant his umbrella forward making an angle theta with the vertical. A student derives the following relation between theta and v, tantheta = v and checks that the relation has a correct limit: as v rarr 0, theta rarr -0 , as expected.. (We are assuming there is no strong wind and that the rain falls vertically for a stationary man). Do you think this relation can be correct? If not, guess the correct relation.