Forces are considered balanced when all of the combined forces lead to no change in the motion of the object. For example, when a book is sitting on a table, the force of gravity is pushing downward and the normal force is pushing upward with exactly the same amount of force. Since they are equal and opposite forces, the book does not move.
Unbalanced forces exist when there are unequal forces acting upon the object, which leads to a change in the state of motion. Unbalanced forces can lead to a change in direction, a change in speed, or both a change in direction and in speed.
Number of atoms equal the number of molecular orbitals as each atom has 1 atomic orbital and 1 electron.
Therefore,
Number of atoms = (mass/molar mass)*Avogadro's number = (7.90/22.99)*1.36*10^23 = 4.67*10^22 atoms.
Then,
Number of molecular orbitals = 4.67*10^22
Answer:Angular width of the electromagnetic wave after it emerges from between the buildings is 2.761 degree
Explanation:
The wavelength of the electromagnetic wave is
Consider two buildings as a single slit, for single slit diffraction dark fringes are located an angle of
where 
is frequency, 
is space between buildings.
For the first dark fringes
Angular width of the electromagnetic wave after it emerges from between the buildings is
