# Needs New Photo

## B1-17: CENTER OF MASS - STICKS

Purpose: Illustrate the center of mass in a surprising way

## B1-12: CENTER OF MASS - HINGED STICK PARADOX

Purpose: Illustrate the center of mass in a surprising way

## B1-11: BALANCE MAN

Purpose: Illustrate stable equilibrium

## B1-09: CENTER OF MASS - TRIANGLE

Purpose: Demonstrate the process of locating the center of mass

## B1-07: DOUBLE CONE - SMALL

Purpose: Demonstrate a center of mass paradox

## A2-32: HEIGHT MEASUREMENT BY TRIGONOMETRY

Category: A2 Mathematics
Purpose: Determine the height of a student using trigonometry

## A2-23: VECTOR PRODUCT

Category: A2 Mathematics
Purpose: Illustrate the product of two vectors

## A2-21: MAGNETIC VECTOR BOARD

Category: A2 Mathematics
Purpose: Demonstrate properties of vectors

## A2-15: HYPERBOLOID FROM STRAIGHT LINES

Category: A2 Mathematics
Purpose: Approximate the hyperboloid

## A2-12: SLATED SPHERE

Category: A2 Mathematics
Purpose: Demonstrate rotation and spherical geometry

## A2-11: CIRCUMFERENCE VS. DIAMETER - CHAIN ON CYLINDER

Category: A2 Mathematics
Purpose: Show the relationship between the diameter and the circumference of a circle

## A2-02: XYZ AXES ON EXTENDED HANDLE

Category: A2 Mathematics
Purpose: Aid in discussing angular momentum

## A2-01: CARTESIAN COORDINATE AXES

Category: A2 Mathematics
Purpose: Illustrate a standard right-handed cartesian coordinate system

## D5-13: FOCAULT PENDULUM - MODEL

Purpose: Model the Foucault pendulum

## O1-01: EYE MODEL - OPTICS

Purpose: Demonstrates optics of the eye and corrections of optical defects

## L3-16 FOCUSING OF HEAT WAVES BY MIRRORS

Category: L3 Curved Mirrors
Purpose: Demonstrates that concave mirrors can focus heat waves

## K2-03 FARADAY'S EXPERIMENT ON INDUCTION

Purpose: Demonstrates the induction between two coils

## H4-04 FOURIER ANALYSIS - DIGITAL OSCILLOSCOPE

Category: H4 Music
Purpose: Demonstrates the Fourier spectrum of complex waves

## G3-53 STANDING WAVES IN A STRING

Purpose: Demonstrates standing waves on a thin string

## D1-61: Rolling versus Sliding

Purpose: Applies conservation of energy to a rolling object
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• #### E2-01: WORLD GLOBE

Illustrate the globe Read More
• #### E2-02: MEASUREMENT OF RADIUS OF EARTH

Demonstrate how the radius of the earth can be measured using trigonometry. Read More
• #### E2-03: CRATER FORMATION MODEL

Illustrate how a crater forms as a result of an impact or a blast from below. Read More
• #### E2-11: SOLAR PLASMA MODEL

Mass driver and ring heater show coronal holes and coronal heating. Read More
• #### E2-12: FUSION MODEL

Demonstrate how nuclei attract each other if they come close enough together. Read More
• #### E2-13: SUNSPOT MODEL

Show how sunspots are darker than their surroundings due to lower temperatures. Read More
• #### E2-21: PHASES OF THE MOON

Show the relationship between the phases of the moon and the relative earth-sun-moon positions. Read More
• #### E2-22 UMBRA AND PENUMBRA

Illustrates shadow umbra and penumbra Read More
• #### E2-23: UMBRA AND PENUMBRA - EXTENDED SOURCE

Show umbra and penumbra with an extended source, as in an eclipse. Read More
• #### E2-24: UMBRA AND PENUMBRA - COLOR FILTERS

Identify the source of penumbra regions. Read More
• #### E2-31: SOLAR SYSTEM MODEL

Illustrate the approximate angular disposition of the planets around the sun. Read More
• #### E2-32: EPICYCLE MODEL - PTOLEMAIC SYSTEM OF PLANETS

Illustrate the epicycle nature of Ptolemy's model of the solar system Read More
• #### E2-33: RETROGRADE MOTION

Demonstrate the observation of another planet as seen from the earth. Read More
• #### E2-34: BASIC ORRERY (PLANETARIUM)

Demonstrate the sun-earth-moon spatial relationship and related concepts.. Read More
• #### E2-35: PLANETS - RELATIVE SIZES MODEL

Illustrate the relative sizes of the planets Read More
• #### E2-36: DENSITY STRATIFICATION - FORMATION OF PLANETS

Demonstrates how density stratification (differentiation) in interior of planets occurs. Read More
• #### E2-37: PLATONIC SOLIDS AND KEPLER

Visualize the Platonic solids and Kepler's dream for using them to explain planetary orbits. Read More
• #### E2-41: TRANSPARENT CELESTIAL GLOBE

Illustrate some relationships between the earth, the sun, and certain heavenly bodies Read More
• #### E2-42: TELESCOPE MODEL

Show how a telescope can view any point in the sky using a universal mount. Read More
• #### E2-43: ROTATING STAR FIELD

Show the apparent motion of the night sky. Read More
• #### E2-44: BINARY STAR MODEL

Illustrate the orbital motion of a binary star system. Read More
• #### E2-45: ECLIPSING BINARY STAR MODEL - LIGHTS

Show how we view a rotating binary star. Read More
• #### E2-46: ECLIPSING BINARY STAR MODEL - SPHERES

Illustrate the orbits of stars in an eclipsing binary. Read More
• #### E2-47: TWINKLING STAR

Show how air currents cause the "twinkling" of a star. Read More
• #### E2-48: NON-TWINKLING PLANET

Illustrate why a planet does not "twinkle" like a star. Read More
• #### E2-49: PULSAR MODEL - RADIOWAVES

Show the changing field pattern from a rotating dipole. Read More
• #### E2-50: PULSAR MODEL - FLASHLIGHTS

Illustrate beaming pattern of pulsars and pulsed binary X-ray sources. Read More
• #### E2-51: GRAVITATIONAL COLLAPSE - MODEL

Model gravitational collapse. Read More
• #### E2-53: STELLAR EVOLUTION - HYDROGEN BURNING

Provides models for hydrogen burning to produce helium in stars via the proton-proton chain. Read More
• #### E2-54: REFLECTING TELESCOPE - STRING MODEL

Shows how rays are focused by a standard reflecting telescope. Read More
• #### E2-61: GALAXY MODEL

Illustrate our galaxy. Read More
• #### E2-62: SPIRAL GALAXY - WATER MODEL

Show that "permanent" spiral structure can exist as a wave which moves independently from the fluid Read More
• #### E2-63: EXPANDING UNIVERSE

Demonstrate the concept of the expansion of the universe. Read More

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