# Needs New Photo

## L3-33: VANITY MIRROR

Category: L3 Curved Mirrors
Purpose: Show the image produced by a cocave mirror.

## B4-33: EGG CRUSHER

Category: B4 Elasticity
Purpose: Show that an egg can support unexpectedly high forces due to its curved shape.

## L3-25: IMAGE LOCATION WITH TV CAMERA - CONCAVE MIRROR

Category: L3 Curved Mirrors
Purpose: Locate the image position for a concave mirror.

## B4-21: DEFLECTION OF BEAM - OPTICAL LEVER

Category: B4 Elasticity
Purpose: Demonstrate the small deflection of an aluminum beam due to weighting between supports.

## B4-14: ELASTIC LIMIT OF WIRE

Category: B4 Elasticity
Purpose: Demonstrate the variation in tensile strength with wire diameter.

## B4-11: ELASTIC LIMIT OF RUBBER BAND

Category: B4 Elasticity
Purpose: Demonstrate Hooke's law and elastic limit.

## B4-04: SPRING AND STRING THING

Category: B4 Elasticity
Purpose: Illustrate series and parallel springs in a counterintuitive way.

## D1-83: SPOOL

Purpose: Illustrate a counterintuitive problem in rotational dynamics.

## D1-82: ROLLING FRICTION

Purpose: Show the direction of the frictional force when a rolling object is accelerated.

## D1-64: MAXWELL PENDULUM - SMALL

Purpose: Demonstrate transformations between gravitational potential energy and rotational kinetic energy.

## D1-63: MAXWELL PENDULUM - LARGE

Purpose: Demonstrate transformations between gravitational potential energy and rotational kinetic energy.

## D1-55: ROTATING ELASTIC RINGS

Purpose: Demonstrate "centrifugal reaction" and to indicate why the earth is oblate.

## D1-42: ROTATING WATER BUCKET WITH SPONGE

Purpose: Illustrate centripetal force and centrifugal reaction with a trick.

## D1-40: CENTRIPETAL FORCE ON ROTATING RUBBER BAND

Purpose: Demonstrate centripetal force and centrifugal reaction.

## D1-39: PENNY AND COAT HANGER

Purpose: Demonstrate centripetal force and centrifugal reaction in a dramatic way.

## D1-31: TRAJECTORY FROM SPIRAL

Purpose: Show that forces are required to create circular motion.

## D1-30: TRAJECTORY FROM CIRCULAR ORBIT - OVERHEAD PROJECTOR

Purpose: Show that the instantaneous velocity of an object executing uniform circular motion is tangent to the circle.

## D1-21: ANGULAR VELOCITY - OBERBECK CROSS

Purpose: Measure the angular velocity of a rotating object.

## E2-61: GALAXY MODEL

Category: E2 Astronomy
Purpose: Illustrate our galaxy.

## E2-54: REFLECTING TELESCOPE - STRING MODEL

Category: E2 Astronomy
Purpose: Shows how rays are focused by a standard reflecting telescope.
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• #### P4-01: Radiation Monitor (Geiger Counter)

Demonstrate radioactivity, the Geiger counter, and some differences between alpha, beta, and gamma radiation Read More
• #### P4-03: RADON DETECTION

Demonstrate that radioactive radon daughters are present in the air Read More
• #### P4-04: COSMIC RAYS

Demonstrate the existence of cosmic rays. Read More
• #### P4-05: PHOTOMULTIPLIER TUBE - LARGE

Show them what a large photomultiplier tube looks like. Read More
• #### P4-06 RADIOACTIVE CONSUMER PRODUCTS

Show some consumer products and naturally occurring materials that are weakly radioactive Read More
• #### P4-07: SHRINK TUBE - IRRADIATED POLYMER

Demonstrate properties of shrink tube. Read More
• #### P4-08: IONIZATION SMOKE ALARM

Demonstrate how a smoke alarm works. Read More
• #### P4-11 RADIOACTIVE DECAY - DICE

Illustrates the radioactive decay of a sample of nuclei. Shows how a half-life is determined Read More
• #### P4-21: NUCLIDES CHART

Use chart of the nuclides in small class groups. Read More
• #### P4-31: CLOUD CHAMBER - INDIVIDUAL VIEWING

Observe alpha and beta particle paths with a cloud chamber. Read More
• #### P4-33: BUBBLE CHAMBER TRACKS - THREE DIMENSIONAL VIEWMASTER

Allow individual viewing of bubble chamber tracks in three dimensions. Read More
• #### P4-41: RUTHERFORD SCATTERING MODEL

Show difference in scattering from the Thompson and Rutherford models of the nucleus. Read More
• #### P4-51: MILLIKAN OIL DROP MODEL

Demonstrate geometry for the Millikan oil drop experiment. Read More
• #### P4-61: CHAIN REACTION MODEL

Demonstrate a molecular chain reaction, either controlled or uncontrolled. Read More
• #### P4-62: CHAIN REACTION - MOUSE TRAP VIDEO

Model of uncontrolled nuclear chain reaction. Read More
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