http://pc5271.org/PC5271_AY2324S2/index.php?action=history&feed=atom&title=Gravitational_Torsion_Balance 2026-10-20T01:45:45Z Revision history for this page on the wiki MediaWiki 1.43.8 http://pc5271.org/PC5271_AY2324S2/index.php?title=Gravitational_Torsion_Balance&diff=50&oldid=prev 2024-02-21T02:50:29Z

<p><span class="autocomment">Procedure</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:50, 21 February 2024</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l26">Line 26:</td> <td colspan="2" class="diff-lineno">Line 26:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>   - Attach the mirror to the wire just below the mount.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>   - Attach the mirror to the wire just below the mount.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>2. Prepare the Large Spheres:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>2. Prepare the Large Spheres:</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>   - Position the larger spheres near the smaller ones<del style="font-weight: bold; text-decoration: none;">, but not too close. Their gravitational attraction should not yet twist the wire significantly</del>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>   - Position the larger spheres near the smaller ones.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>3. Set Up the Laser and Photodiode Array:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>3. Set Up the Laser and Photodiode Array:</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>   - Position the laser so that it shines on the mirror.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>   - Position the laser so that it shines on the mirror.</div></td></tr> </table>

Laphas http://pc5271.org/PC5271_AY2324S2/index.php?title=Gravitational_Torsion_Balance&diff=49&oldid=prev 2024-02-21T02:48:50Z

<p><span class="autocomment">Team members</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:48, 21 February 2024</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Team members==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Team members==</div></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Laphas Precmcharoen, Song Runlin</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>Laphas Precmcharoen, Song Runlin<ins style="font-weight: bold; text-decoration: none;">, Gao Jia</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Idea==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Idea==</div></td></tr> </table>

Laphas http://pc5271.org/PC5271_AY2324S2/index.php?title=Gravitational_Torsion_Balance&diff=48&oldid=prev 2024-02-21T02:47:01Z

<p><span class="autocomment">Team members</span></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:47, 21 February 2024</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Team members==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Team members==</div></td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Laphas Precmcharoen, Song Runlin</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Idea==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>==Idea==</div></td></tr> </table>

Laphas http://pc5271.org/PC5271_AY2324S2/index.php?title=Gravitational_Torsion_Balance&diff=46&oldid=prev 2024-02-21T02:44:48Z

<p>Created page with &quot;==Team members== ==Idea== This project aims to determine the gravitational constant using the gravitational torsion balance based on the Cavendish Experiment ==Materials== 1. Thin, Lightweight Rod (~ 1 m in length) 2. Small Lead or Steel Spheres (~ 1 to 5 cm in diameters) 3. Large Lead or Steel Spheres (~ 20 cm in diameters) 4. Copper Wire (~0.05 mm in diameter ~ 30cm in length) 5. Small Mirror 6. Laser 7. Ruler or Photodiode array to measure the angle 8. Stable...&quot;</p> <p><b>New page</b></p><div>==Team members==<br /> <br /> ==Idea==<br /> This project aims to determine the gravitational constant using the gravitational torsion balance based on the Cavendish Experiment <br /> ==Materials==<br /> 1. Thin, Lightweight Rod (~ 1 m in length)<br /> <br /> 2. Small Lead or Steel Spheres (~ 1 to 5 cm in diameters)<br /> <br /> 3. Large Lead or Steel Spheres (~ 20 cm in diameters)<br /> <br /> 4. Copper Wire (~0.05 mm in diameter ~ 30cm in length)<br /> <br /> 5. Small Mirror<br /> <br /> 6. Laser<br /> <br /> 7. Ruler or Photodiode array to measure the angle<br /> <br /> 8. Stable, Vibration-Free Mount<br /> ==Procedure==<br /> 1. Set Up the Torsion Balance:<br /> - Attach the smaller spheres to each end of the rod.<br /> - Suspend the rod horizontally from its center using the torsion wire. The wire should be attached securely to a stable mount.<br /> - Attach the mirror to the wire just below the mount.<br /> 2. Prepare the Large Spheres:<br /> - Position the larger spheres near the smaller ones, but not too close. Their gravitational attraction should not yet twist the wire significantly.<br /> 3. Set Up the Laser and Photodiode Array:<br /> - Position the laser so that it shines on the mirror.<br /> - Set up the photodiode array at an appropriate distance so that it can detect the laser light reflected from the mirror.<br /> 4. Calibrate the Photodiode Array:<br /> - Shine the laser on each photodiode in the array and record the output. This will give you a calibration curve that you can use to convert photodiode signals into angles of rotation.<br /> 5. Perform the Experiment:<br /> - Carefully move the larger spheres closer to the smaller ones. The gravitational attraction will cause the rod to twist, turning the mirror and shifting the laser spot on the photodiode array.<br /> - Record the photodiode output at regular intervals.<br /> 6. Data Analysis:<br /> - Use your calibration curve to convert the photodiode signals into angles of rotation.<br /> - Calculate the gravitational constant using the observed rotation, the known mass of the spheres, and the properties of the torsion wire.</div>

Laphas