Friday, March 31, 2017

Simple Harmonic Oscillation - PHYSICS


In order for mechanical oscillation to occur, a system must posses two quantities: elasticity and inertia. When the system is displaced from its equilibrium position, the elasticity provides a restoring force such that the system tries to return to equilibrium. The inertia property causes the system to overshoot equilibrium. This constant play between the elastic and inertia properties is what allows oscillatory motion to occur.

The animated gif shows the simple harmonic motion of three undamped mass-spring systems, with natural frequencies (from left to right) of ωo, 2ωo, and 3ωo. All three systems are initially at rest, but displaced a distance xm from equilibrium.


Source:
http://www.acs.psu.edu/drussell/Demos/SHO/mass.html

Reference:http://farside.ph.utexas.edu/teaching/315/Waves/node4.html
http://scipp.ucsc.edu/~haber/ph5B/sho09.pdf

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Thursday, March 30, 2017

Ganymede's Shadow - UNIVERSE


Approaching opposition early next month, Jupiter is offering some of its best telescopic views from planet Earth. On March 17, this impressively sharp image of the solar system's ruling gas giant was taken from a remote observatory in Chile. Bounded by planet girdling winds, familiar dark belts and light zones span the giant planet spotted with rotating oval storms. The solar system's largest moon Ganymede is above and left in the frame, its shadow seen in transit across the northern Jovian cloud tops. Ganymede itself is seen in remarkable detail along with bright surface features on fellow Galilean moon Io, right of Jupiter's looming disk.

Image & info via APOD
https://apod.nasa.gov/apod/astropix.html
Image Credit & Copyright: Damian Peach, Chilescope

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