Pleasebe

Seated

Summer Programsfor

Pre-College Students

New from Lecture-Demonstration

Now on a two-DVD set:The classic four-hour video collection:

Demonstrations in Acousticsfor only $20. Discount for direct cash Sales. Inquire in front.

Dr. Richard E. Berg, demonstrating over 70 experiments, in 29 titled segments, covering vibrations, waves and sound.

You are welcometo visit our

Physics Question of the Week

http://www.physics.umd.edu/lecdem/outreach/QOTW/active/questions.htm

Physics is Phun

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Water

Physics is PhunMay 2009

Image compliments of http://www.inmagine.com/v3058/v3058059-photo

Topics:Physical propertiesElectrical properties

Changes of StateAtmospheric phenomena

Physical Properties of Water

Density = 1 g/cm3 = 1 kg / liter

Specific Gravity = 1.000 @ 3.98oC

Specific Heat = 1 cal / gram oC = 1 Btu / lb oF

Heat of Fusion = 80 cal / gram = 144 Btu / lb

Heat of Vaporization = 540 cal / gram = 970 Btu / lb

Weight and Pressure

Crush the can usingatmospheric pressure

Equilibrium tubes

Quiz question:

What animal has the highest blood pressure?

Mammal, fish, bird, or reptile?

Quiz question:

What animal has the highest blood pressure?

Quiz answer:The giraffe!!

Pascal’s Law

Hero’s Fountain(Hero of Alexandria)

Pressure is distributed uniformly throughout

a confined fluid.

Buoyancy andArchimedes’ Law

An object immersed in a fluidexperiences a buoyant force

equal to the weightof the fluid displaced.

Quiz Question

Adhesion and Cohesion:Surface Tension

Thread loop on water

Capillary tubes

Dilatancy

Electrical Properties

2. Polarization - wood - water

1. Conductivity

Superheated water in a

Microwave Oven

Changes of State

Ice Crystals

Freezing and melting

Putting salt on snow and ice

The Ice Bomb

Evaporationand Condensation

Can collapse by condensation

Freezing water by pumping

Sublimation

Ice disappears in freezer orsub-freezing weather

Frost patterns onwindows(Ice Ferns)

Hailstones

Form in layers

Can be seen usingpolarized light

Waterin the

Atmosphere

RainbowMie scattering

Rainbow

DoubleRainbow

Rainbow with Supernumerary Arc

Glass Bead Rainbow N1-43

“World’s largest human rainbow”

31,000 people at the Polytechnic University of the Philippines.

Correct Rainbow!

South side of Route 50 on Kent Island, MD

Glory

Diffraction effect

Glory 1

Glory 2

Ice crystalsin the

atmosphere

Pencil and

Plate Ice

Crystals

Dispersion by Hexagonal Crystal

Sundog

Dispersion effect

SundogwithSun

Pillar

Halo

Dispersion effect

Halo

Halo with Sundog and Sun Pillar

“Fire Rainbow”

Sunlight enters the hexagonal plate crystals' vertical side faces and leaves through their bottom faces, is refracted (as through a prism) and separated into an array of visible colors

Various atmospheric Phenomena

Wisdomfor theYear

If you are not part of the solution,

you are part ofthe precipitate.

We are on the web at

http://www.physics.umd.edu/lecdem/

Animated Gifs compliments of bellsnwhistles.com

The EndSee you next year!