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Quasar

Quasars have large red shifts, indicative of great distance from the earth, but have variability with periods of weeks or months which indicate that they are small. Their size is on the order of ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/astro/quasar.html#c1

Nils Gustaf Dal�n (1869 - 1937) major invention was the sun-valve, which causes a beacon to light automatically at dusk and extinguish itself at dawn, enabled lighthouses to function perfectly and ...

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http://nobelprize.org/nobel_prizes/physics/laureates/1912/dalen-bio.html

Roemer's Hypothesis

Roemer's observations of the periods of Jupiter's moon allowed the first estimate of the speed of light, and confirmed the speed of light as finite. A good site relevant to all college students in ...

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http://mathpages.com/home/kmath103/kmath103.htm

Pendulum Power

A worksheet for younger pupils. Objective: The period of a pendulum depends on the length of the string, not the mass of the bob.

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http://teacher.scholastic.com/lessonrepro/reproducibles/profbooks/pendulumpwr.pdf

Simple pendulum

An animation that shows a pendulum moving with plots for kinetic and potential energy. Mass, length, gravity and period can be adjusted

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http://www.phy.ntnu.edu.tw/~hwang/Pendulum/Pendulum.html

Oscillator

Simple Pendulum simulator. Users can vary amplitude, mass, length and gravity of the system to see how it changes the time it takes the pendulum to swing (period).

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http://www.msu.edu/user/brechtjo/physics/pendulum/pendulum.html

Pendulum, Physical

The derivation of the period of oscillation of a physical pendulum along with interactive calculations to consolidate understanding.

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http://hyperphysics.phy-astr.gsu.edu/hbase/pendp.html#c1

Explorescience: Simple Harmonic Motion

Simple Pendulum and mass-on-spring - change gravity and other variables to see effect on period of oscillation. Good alternative to "real" experiment. Subscription required but with 30 day free trial.

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http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=44

Phase in AC Circuits

When capacitors or inductors are involved in an AC circuit, the current and voltage do not peak at the same time. The fraction of a period difference between the peaks expressed in degrees is said to ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/electric/phase.html#c1

Cygnus X-1

Doppler studies of this blue supergiant in Cygnus indicate a period of 5.6 days in orbit around an unseen companion. The mass of the companion is calculated to be 8-10 solar masses, much too large to ...

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http://hyperphysics.phy-astr.gsu.edu/hbase/astro/blkbin.html#c1

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