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The moment of a force about any point is defined as the force x perpendicular distance from the line of action of the force to the point - moment = F x d the unit is Nm.
Principle of moments states t...

Scalars have a magnitude (size) only. Vectors have both magnitude and direction.

The photoelectric effect is the emission of electrons from the surface of a metal due to exposure of electromagnetic radiation above a certain frequency.
Photon energy (E=hf or E=hc/λ).
The work...

Matter and antimatter will annihilate if they meet:
1) Particle meets antiparticle.
2) Both have rest energies due to their masses.
3) Both have kinetic energies due to their movement (i...

The Strong Nuclear Force keeps protons and neutrons together in the nucleus.Its range is no more than about 3-4 fentometres.
It has equal effects between a proton-neutron, neutron-neutron and proton-...