The equation of motion of a pendulum is:
where 
it its length and 
is the gravitational acceleration. Notice that the mass is absent from the equation! This is quite hard to solve, but for <em>small</em> angles (
), we can use:
Additionally, let us define:
We can now write:
The solution to this differential equation is:
where 
and 
are constants to be determined using the initial conditions. Notice that they will not have any influence on the period, since it is given simply by:
This justifies that the period depends only on the pendulum's length.
Speed of sound in cold air, speed of sound in warm air, speed of sound in steel speed of sound in water, and speed of sound in hot molten lead
The answer is C. I<span>s a stretch and/or tear of a ligament.</span>
Answer:
Period becomes 1/3 of the original
Explanation:
Period = 1/f if f becomes 3f then period becomes 1/3 of the original
The statement "like planets orbiting the sun" best explains the Bohr's model. Niels Bohr postulated that electron revolve around the nucleus in specific orbitals which are quantized. These orbits are represented by the letters K.L.M,N. The maximum number of electrons in each orbit is determined by 
, where n is the number of the orbit. When an electron absorbs energy it moves to a higher orbit, and it moves to a lower orbit when it emits energy. This movement produces discrete spectra which explains the reason for quantized energy levels.
