Vehicles carrying inflammable materials usually have metallic ropes touching the ground during motion. Why?

Why does a place of wood floating on water have no Brownian motion?

Two metals spheres of the same material and of equal radius R are touching each other.Prove that the force of attraction between them is proportional to R^4

Why alkali metals have low melting and boiling points?

Same quantity of ice is filled in each of the two metal containers P and Q having the same size, shape and wall thickness but made of different materials. The containers are kept in identical surroundings. The ice in P melts completely in time t_1 whereas that in Q takes a time t_2 . The ratio of thermal conductivities of the materials of P and Q is

Why alkali metals have strong electropositive character?

Explain why the alkali metals have the largest atomic size in their respective periods.

On a planet from a distant galaxy, the pilot vehicle collected a sample of bacteria-like material. On analysis, it showed proteins having 30 types of amino acids while the DNA has 6 types of bases. In the genetic code, a sequence of how many bases should be serving as a codon?

On a smooth plane inclined at 30^(@) with the horizontal, a thin current carrying metallic rod is placed parallel to the horizontal ground. The plane is in a uniform magnetic field of 0.15T alon the vertical direction. For what value of current can the rod remain stationary ? the mass per unit lenght of the rod is 0.30 kg/m.