What is the velocity of wave in a sting of line or mass density m when strotched to tension T?

What is the velocity of e.m. waves in free space?

The escape velocity of a particle of mass m varies directly as

What is the velocity of wave in monoatomic gas having pressure 1 kilo-pascal and densitry 2.6 kg/m^3 ?

What is the momentum of an object of mass m moving with velocity v ?

If A is the areal velocity of a planet of mass M,then its angular momentum is :

Consider a rectangular block of wood moving with a velocity v_(0) in a gas at temperature T and mass density rho . Assume the velocity is along X-axis and area of cross section of the block perpendicular to v_(0) is A. Show that the drag force on the block is 4(rho) A v_(0) (sqrt(KT))/(m) , where m is the mass of the gas molecule.

What is the de-Broglie wavelength of an atom of mass m, moving at absolute temperature T K?