1.A round table with four symmetrical pointed legs is lying over a horizontal surface.If mass of the table is m , then normal reaction of surface on each leg is equal to (1) 2mg (2) mg/4 (3) mg/3 (4) mg/2

A block of mass m is placed on a rough horizontal surface. If minimum force to pull the block is (mg)/(2) then coefficient of friction is :

In magnesium sulphide, the ratio by mass of Mg and S is 3:4. What is the ratio of number of Mg and S atoms?

In the reaction 3Mg + N_2 rarr Mg_3N_2

A unifrom cube of mass m and side a is placed on a frictionless horizontal surface. A vertical force F is applied to the edge as shown in Fig. Match the following (most appropriate choice) : (a) mg//4 lt F lt mg//2 (i) Cube will move up. (b) F gt mg//2 (ii) Cube will not exhibit motion. (c ) F gt mg (iii) Cube will begin to rotate and slip at A . (d) F = mg//4 (iv) Normal reaction effectively at a//3 from A, no motion.

Diagonal relationship is shown by (1).B-S (2).Li - Mg (3).Mg – Ca (4).S - Se

[" A cube of side "I" and "mass M" is placed "],[" on rough horizontal surface and the friction "],[" is sufficient "so" that it will not move,if a "],[" constant force "F=Mg" is applied "],[" horizontally "1/4" above the surface.Then "],[" the torque due to normal force about "],[" center of the cube is equal to "]

After 3 hours, only 0.25 mg of a pure radioactive material is left, if initial mass was 2 mg than the half life of the substance is

A horizontal force F = (mg)/(3) is applied on the upper surface of a uniform cube of mass m and slide a which is resting on a rough horizontal surface having mu = (1)/(2) . The distance between lines of action of mg and normal reation is