Nuclear energy is..

a. energy contained in the bonds between atoms
b. energy contained in the neutrons of the atom
c. energy contained in the nucleus of an atom
d. energy contained in the protons of an atom

Two particles of masses m and 2m are placed on a smooth horizontal table. a string, which joins these two masses, hangs over the edge supporting a pulley, which suspends a particle of mass 3m.the pulley has negligible mass. the two parts of the string on the table are parallel and perpendicular to the edge of the table. the hanging parts of the string are vertical. find the acceleration of the particle of mass 3m.

What is hidden during a lunar eclipse? isn't the moon hidden?

Anybody wanna ? (picture included? )