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With the pivot point at the center of mass it rotates with a constant speed. Six pictures were taken using the burst mode on the camera. Photoshop was used to make them into one image. ASU copyright With the pivot point at the geometric center the speed varies as it spins. A strobe was used to take this picture. ASU copyright The two spheres pivoted about the geometric center. ASU copyright The two spheres pivoted about the center of mass. ASU copyright
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PHYSICS |
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| 1D40.35A | Two Spheres Center of Mass | Rating:![]() |
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Captions and Credits to the left in the sidebar. |
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Description: Two spheres, one is one inch in diameter and the other is three inches in diameter, are connected by a rod. There are two holes in the rod. Once at the geometric center and the other at the center of mass. |
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| Room:PS F175 & H156 | Location: Aa3 & Ad6 | Sublocation: | ||
| Type: demo | Date Added:3/15/2006 | Condition: | ||
| Quantity:1 | Complete: | Last updated: 6/7/2006 | ||
| Purpose: | ||||
| Safety Issues: Disclaimer (Warning - work in progress - may be incomplete) | ||||
| Equipment Issues: | ||||
| Parts:
Large Black sphere is 3 in diameter and 182 g. Small wood sphere is 1" diameter and 5 g Rod is 43 g and 52 cm long Center-of-mass is 6 cm to black sphere and 48 cm to small sphere. |
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| Copyright © 2000 | Instructions: Put the handle at the geometric center of mass and start the large sphere at the top. It has a variable speed motion speeding up as it goes down and slows as it goes up. Put the handle in the center-of-mass hole and spin the two sphere system. The motion has a constant velocity. |
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| Arizona Board of Regents | Notes: | |||
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| Accessibility | References: | |||
| Links: | Movie: | Caption: | ||
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| 1A0 | MEASUREMENT |
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| 1A10 | Basic Units |
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| 1A10.10 | Basic units set-Video | Video Encyclopedia: Show a clock with a second sweep, meter & yard sticks, and kilogram and pound mass |
VE01_01
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3_1
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PS F175
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| 1A10.35 | Meter stick - 4 sided | Graduated in meters, decimeters, centimeters, & millimeters |
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Aa2
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PS F175
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| 1A10.50 | Liter Cube/set |
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Aa2
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PS F175
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| 1A10.510 | Meter Cube | Meter cube frame, stored dismantled |
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Aa2
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PS F175
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| 1A10.520 | Volume Perception Paradox | One liter of colored water is poured from a sphere to cylinder. The sphere seems smaller but is of equal volume. |
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PS F175
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| 1A10.60 | Avogadro's Number box | Black 22.4 liter cube |
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Aa2
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PS F175
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| 1A20 | Error and Accuracy |
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| 1A20.10 | Gaussian curve - Video | Video Encyclopedia: A commercial device for the overhead projector where ball bearings roll through an array of nails into parallel chutes. |
VE16_12
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3_1
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PS F175
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| 1A20.25A | Dice - ordinary |
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Aa2
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PS F175
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| 1A20.25B | Dice - overhead |
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Aa2
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PS F175
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| 1A20.25C | Dice - polyhedral |
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Aa2
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PS F175
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| 1A20.25D | Dice - large foam |
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Aa2
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PS F175
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| 1A30 | Coordinate System |
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| 1A30.10A | XYZ Coordinate axes | Long arrow shafts with label attachments |
top
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7
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PS F175
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| 1A30.10B | XYZ Coordinate axes | Zometool version |
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Aa3
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PS F175
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| 1A30.10C | XYZ Coordinate axes | Medium arrow shafts with dull broadheads |
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cabinet
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PS H356
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| 1A30.30 | Polar Coordinates | A semi circle is rotated about an axis to demonstrate why integration over theta is from zero to 180 degrees. |
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Aa3
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PS F175
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| 1A30.30 | Polar Coordinates |
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| 1A30.40A | Chalkboard Globe - Large |
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Af6
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PS H156
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| 1A30.40B | Chalkboard Globe - Small |
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Af6
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PS H156
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| 1A40 | Vectors |
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| 1A40.001 | Vector models, Magnetic Field model, Electric Field model, Electromagnetic Field model | Three cardboard vector models. 1) A uniform vector field represented by 9 arrows in 3 by 3 array. 2)Single vector represent by an arrow perpendicular to cardboard. 3) Same as 2) except a circle is drawn around the arrow to represent the curl of the vector |
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Aa3
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PS F175
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| 1A40.10 | Vector components (3D)-Video | Video Encyclopedia : Metal arrows define a three dimensional coordinate system. An arbitrary vector is viewed in three planes. |
VE01_07
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3_1
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PS F175
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Records 1 to 25 of 1978
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