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#### Astrophysics

The Sound of Earthsong

A NASA spacecraft has recorded eerie-sounding radio emissio coming from our own planet. These beautiful "songs of Earth" could, ironically, be respoible for the proliferation of deadly electro in...

Rare Type 1a Supernova Progenitor System Observed

The multi-ititutional Palomar Traient Factory (PTF) team has released the fit-ever direct observatio of a Type 1a supernova progenitor system.
Astronome have collected evidence indicating tha...

Dark Matter

We take a look at mysterious dark matter - and a chocolate pie.77yXhAibQp4

Gigayear

Astronome have a symbol for 1,000,000,000 yea - that's a billion yea.1_0cw6OrBeY

2012 Perseid Meteor Shower

The Peeid meteor shower is underway. There's more to see than meteo, however, when the shower peaks on August 11th through 13th. The brightest planets in the solar system are lining up in the midd...

#### Classical Mechanics

Projectile Motion – Fired at ground level

A football is kicked with an initial velocity of 25 m/s at an angle of 45-degrees with the horizontal. Determine the time of flight, the horizontal displacement, and the peak height of the football .....

Projectile Motion – Pool ball leaves the table with initial horizontal velocity

A pool ball leaves a 0.20-meter high table with an initial horizontal velocity of 2.4 m/s. Predict the time required for the pool ball to fall to the ground and the horizontal distance between the tab...

Force on a batted ball – Impulse

A baseball (m = 0.14 kg) thrown by a pitcher reaches a bat with a velocity of 32.0 m/s in a horizontal direction.
a) Computer the impulse that must be applied to the ball if it is to leave the...

Average impact force between and airliner and a bird

Estimate the average impact force between an airliner traveling at 260 m/s and with a 0.3 kg bird whose length is 20 cm?The change in velocity of the bird is estimated to be 260 m/s
Thes...

Find Earth angular momentum

Find Earth angular momentum using Earth-Sun distance and mass of Earth?
Earth - Sun distance 149.6x109 m
Mass of the Earth 5.9742x1024 kgEarth angular momentumFor an orbit, angular momen...

Find speed of a satellite placed at geostationary orbit

A 270 kg communication satellite is placed in a geostationary orbit 35,780 km above a relay Earth ground level. What is the speed of the satellite in orbit?
A geostationary o...

#### Classical Mechanics

Momentum

Momentum in classical mechanics
If an object is moving in any reference frame, then it has momentum in that frame.The amount of momentum that an object has depends on two physical quantities: th...

Newtons second law of motion

Newton's second law: Law of Motion
The rate of change of momentum of a body is equal to the resultant force acting on the body and is in the same direction.
Newton's second law as originally state...

Point kinetics in a fixed coordinate system

DefinitioThe position the velocity and the acceleration are defined by:The following holds:When the acceleration is cotant this gives:
For the unit vecto in a direction perpen...

Point dynamics in a fixed coordinate system

Force, (angular)momentum and energy
Newton's 2nd law connects the force on an object and the resulting acceleration of the object where the momentum is given by ::Newton's 3rd law is given by...

Point dynamics in a moving coordinate system

Apparent forces
The total force in a moving coordinate system can be found by subtracting the apparent forces from the forces working in the reference frame: . The different apparent forces are give...

Dynamics of masspoint collections

The centre of mass
The velocity with respect to the centre of mass is given by The coordinates of the centre of mass are given by:In a 2-particle system, the coordinates of the centre of mas...

#### Classical Mechanics

Unit Conversion

Paul discusses unit conveion by mea of cancellation, illustrated with a simple average-velocity problem featuring Fast Freda.4EhkFuVGmco

Centrifugal Force

Hank addresses the so-called centrifugal force, and explai why you really mean centripetal force.DLgy6rVV-08

Bikes and Bee Problem

Paul shows a simple solution to a classic problem involving the motion of a bee that flies to-and-fro between approaching bikes.lw-rhXczLGI

Linear Motion Definitions

Paul links central kinematic definitio and equatio to Barry Biker.MfDv4FMDlpI

Gravitation: The Four Fundamental Forces of Physics

Hank continues our series on the four fundamental forces of physics with a description of gravitation - the interaction by which physical bodies attract with a force proportional to that of their ma...

Usain Bolt vs. Gravity

Who's faster over 10 mete - the fastest sprinter in the world, or gravity9YUtFpLpGfk

#### Classical Mechanics Tools

Projectile Motion

Physics Tools for projectile motion
Use this simple tool to solve physics problem related to projectile motion. You can use this tool for any projectile fired on ground level at an angle of theta de...

Projectile Motion – Projectile fired above the ground level

Use this simple tool to solve physics problem related to projectile motion. You can use this tool for any projectile fired above the ground level with initial velocity at horizontal direction. Simply...

Solve physics problem related to collision between airliner and a bird

Physics Tools for classical mechanics- Use this simple tool to solve physics problem related to collision between airliner and a bird
Use this simple tool to solve physics problem related to collisio...

Solve problem related to object falling from rest

As an object falls from rest, its gravitational potential energy is converted to kinetic energy. Coider a mass m which is falling vertically under the influence of gravity.Potential Energy...

Solve problem related to impact force from falling object

As an object falls from rest, its gravitational potential energy is converted to kinetic energy. Coider a mass m which is falling vertically under the influence of gravity.Object is falling...

#### Demonstration

Schrödinger’s cat

Schrödinger's cat is a thought experiment, sometimes described as a paradox, devised by Austrian physicist Erwin Schrödinger. It illustrates what he saw as the problem of the Copenhagen interpreta...

Foam Physics

What is the link between giraffes, wine corks and the map of the Univee?yLTrD9LYQTs

How Does A Boomerang Work?

A boomerang can execute its unique roundtrip flight by making use of three fundamental physics principles: lift, relative velocity, and gyroscopic precession.ADJKsLEAOHo

The Electric Cannon

We use an unusual cannon to demotrate electrical conductivity at different temperatures.eA3SDiyMiWU

Yo-Yos in Space

NASA Astronaut Don Pettit uses his off-duty time to practice his microgravity yo-yo skills.ni4j5K4Lz3o

Touch Screens and Quantum Tunnelling

We look at the latest touch screen technology and how it uses the strange phenomenon of quantum tunnellingqI5q6OqSo4s

#### Fluids and Thermodynamics

Solid Nitrogen, Vacuum Cooling and Dry Ice

What happe when you decrease the pressure around a liquid? It boils. Water boils at room temperature once the pressure is low enough. What is interesting is that this decreases the temperature of t...

Effects of water pressure

This clip illustrates the effects of water pressure on a ball filled with air. The same compression happe to the air iide the human ear, which is why we have to equalize the ea when freediving....

Heat conduction

Heat conduction. Wooden and metal pedestal stand in hot water. Since metal is a better heat conductor than wood, the ice cube on a metal pedestal melt faster than the ice cube on wooden pedestal....

Paramagnetism of Oxygen

Oxygen gas is condeed into liquid form and then poured between the poles of a strong magnet so we can observe its paramagnetic properties.We send O2 gas through a copper coil, which is then imm...

Lenses and Vortices

NASA Astronaut Don Pettit takes advantage of the weightless environment
aboard the ISS to do diffusion and le experiments with pure water.
Distributed as part of a collaboration between NASA and...

Anti-Gravity Water Trick

It's easy to keep water in an upside down container with nothing but a card. However, only those possessing extreme skill can keep the
water from falling out when the card is removed. Are YOU skil...

#### FORTRAN

Fortran Online Resouces

Univeity of Michigan-Dearborn, Computer and Information Science This site contai History of Fortran Language and lot of links to useful sites.
http://www.engin.umd.umich....

Variables and the names of variables

Fundamentals of Fortran Computation
Variables and the names of variables
Integer
A whole number. It may...

Operations and Expressions

Operatio and Expressio
FORTRAN provide five basic arithmetic operatio:
Addition +
Subtraction -
Multiplication *
Div...

FORTRAN Tutorials – Input and Output

Input and Output
FORTRAN provides a great deal of power and flexibility in the reading of data and printing of results. And for the experienced programmer this power and fle...

Writing and Running a FORTRAN Program

STOP and END Statements
STOP
This statement may be written whenever it is necessary to stop executing statements in a program. There is normally a STOP a...

FORTRAN DO Statement

The DO Statement
This statement makes it possible to execute a section of a program repeatedly, with automatic changes in the value of an integer variable between...

#### Mathematical Tools

Calculate Linear Regression and Graph Scatter Plot and Line of Best Fit

What is simple linear regression?
Simple linear regression is a way to describe a relatiohip between two variables through an equation of a straight line,
called...

Google smart graphing functionality

Google launched a graphing functionality right in search to help students and math love plot functio in an easy, simple way.
In addition to calculating something simple like dividing up a re...

Google Smart Calculator

Want to add up a list of numbe, convert from miles to kilomete, or evaluate
some other mathematical expression? Itead of using a piece of paper, your
calculator, or a computer math software...

Bitwise Operation

Decimal to Hexadecimal and Hexadecimal to Decimal ConverterOnline Bitwise Calculator
In computer programming, a...

Morse Code Conversion Tool

Moe code is a method for tramitting telegraphic information,
using standardized sequences of short and long elements to represent
the lette, numerals, punctuation and sp...

Roman Numeral Conversion with Roman Calculator and Roman Tests

Roman numerals are a numeral system originating in ancient Rome,
adapted from Etruscan numerals. The system used in classical antiquity
was slightly modified in the Middle...

#### Modern Physics

Michio Kaku Explains String Theory

Theoretical physicist Michio Kaku explai the basics of String TheorykYAdwS5MFjQ

Strong Interaction: The Four Fundamental Forces of Physics

Part one of a four part series on the fundamental forces (or interactio) of physics begi with the strong force or strong interaction - which on the small scale holds quarks together to form proto...

What is Antimatter?

Fermilab scientist Don Lincoln describes antimatter and its properties. He also explai why antimatter, though a reality, doesn't pose any current threat to our existence!en2S1tBl1_s

Higgs Boson: How do you search for it?

Fermilab scientist Don Lincoln describes the concept of how the search for the Higgs boson is accomplished. Several large experimental groups are hot on the trail of this elusive subatomic particle...

What is the Wave/Particle Duality?

Wave Particle Duality and why quantum mechanics is weirder than anything we're used to in our daily lives!Q_h4IoPJXZw_riIY-v2Ym8

Neutrons and Nanoscience

Beams of neutro can be used to make important discoveries in the world of nanoscience. Here we explore three itruments (and beamlines) at the ISIS facility in Oxfordshire, where Neutro are put to...

#### Optics Tools

Snells Law

Use this simple tool to solve physics problem related to simple light ray reflection problems. You can use this tool for light ray passes from a one medium to another. Simply enter the values you know...

Find Critical Angle

Use this simple tool to solve physics problem related to critical angle condition for reflection. You can use this tool for light ray passes from a one medium to another to find the critical angle...

Find critical angle and condition for total reflection

Use this simple tool to solve physics problem related to critical angle condition for total reflection or tramittance. You can use this tool for light ray passes from a one medium to another medium w...

Focal length for thin lens

Physics Tools for optics - Find Focal Length of thin le using R1 and R2 radii
Use this simple tool to solve physics problem related to thin lees. You can use this tool find focal length for thin...

Two lens system tool – Image distance and magnification

Physics Tools for optics - Find image distance and magnification for two le system
Use this simple tool to solve physics problem related to two le system. You can use this tool find position o...

#### Physical Constants in Mechanics

Densities of Common Substances

Deity is defined as mass divided by volume, or mass per unit volume. The deity in kilograms per cubic meter can be obtained by multiplying the table values by 1000.
The deities of most of the pure...

Viscosity of Liquids and Gases

Viscosity has the SI units Pascal seconds (Pa s) which is called the Poiseuille. More commonly used is the dyne sec/cm2 which is called Poise. One Pa s is 10 Poise. The Poise is used in the table bec...

Compressibility of Liquids

Compressibility is the fractional change in volume per unit increase in pressure. For each atmosphere increase in pressure, the volume of water would decrease 46.4 parts per million. The compressibili...

Physical Properties of Some Typical Liquids

Property
Argon
Benzene
Solid
Liquid
Solid
Liquid
Deity (kg/m3)
1636
1407
100...

Angular Speed of Earth

The average angular speed Wav is the average rate of change of the angular displacement.The Earth's angular velocity is cotant (or nearly cotant). Therefore we can calculate the average ang...

Moment of Inertia for Uniform Objects

Object
Axis of Rotation
Moment of Inertia
Solid Disk
Central axis of disk...