PIRA 1L10.00 UNIV. GRAVITATIONAL CONSTANT

DCS #DEMONSTRATIONREFERENCEABSTRACT
1L10.00Univ. Gravitational Constant
1L10.01falling apple storyAJP 59(1),84Quotes from the original accounts of the falling apple and Newton.
1L10.10Cavendish balance film loopPIRA 200Time lapse of the Cavendish experiment.
1L10.10Cavendish balance film loop1L10.10Time lapse of the Cavendish experiment.
1L10.20Cavendish balance modelPIRA 1000
1L10.20Cavendish balance model1L10.20A model of the Cavendish balance with sliding masses.
1L10.20Cavendish balance modelMn-1Model of the Cavendish balance.
1L10.30Cavendish balancePIRA 500
1L10.30Cavendish balance1L10.30Set up the standard Cavendish balance with a laser beam.
1L10.30Cavendish balanceTPT 10(8),477A platform is used to decouple the Cavendish balance from the building vibrations.
1L10.30Cavendish balance8-8.7Quite a bit of discussion about the Klinger KM 1115 gravitational torsion balance.
1L10.30Cavendish balanceM-128Standard Cavendish experiment with lead balls and optical lever detection.
1L10.30Cavendish balanceM-9bMount the Cavendish balance permanently in the classroom and adjust hours before the experiment.
1L10.30Cavendish balanceDisc 07-23The commercial device with video over a 1 1/2 hour period.
1L10.33Cavendish balance - dampingAJP 34(2),xvA small ball bearing attached to the bottom of the vane dips into a cup containing silicon oil.
1L10.34Cavendish balance wire replacementAJP 55(4),380Use amorphous metallic ribbon as a wire replacement which gives a higher spring constant and is more durable.
1L10.35do-it-yourself Cavendish balanceAJP 33(11),963A simple Cavendish balance built by sophomore students.
1L10.36modified torsion balanceAJP 57(5),417A very small suspension wire is used allowing the linear accelerations to be measured directly.
1L10.41resonance Cavendish balanceAJP 51(10),913The Cavendish balance is driven into resonance by swinging the external mass. Suitable for corridor demonstration.
1L10.42servo mechanism Cavendish balanceAJP 49(7),700Abstract from the apparatus competition.
1L10.42servo mechanism Cavendish balanceAJP 51(4),367The torsion bar does not appreciably rotate. A simple electronic servomechanism is used to maintain rotational equilibrium as an external mass is introduced. The resulting servo correction voltage is proportional to the torque introduced by gravity. This effect can be observed in tens of seconds.
1L10.43Cavendish balance compensationAJP 54(11),1043Modify the Leybold Cavendish balance with a electromagnetic servosystem of damping that reduces the settling time to a few minutes.
1L10.45automatic recording CavendishAJP 55(9),855The reflected laser light from the Cavendish balance falls on a two-element photodiode mounted on a strip chart recorder with appropriate electronics to keep the spot centered on the diode.
1L10.50gravitational field modelPIRA 1000
1L10.50gravitational field model1L10.50

ReferenceDescription
M-1Sutton
Ma-1Freier & Anderson
M-1dHilton
8-2.8Meiners
1A12.01University of Minnesota Handbook
AJP 52(1),85American Journal of Physics
TPT 15(5),300The Physics Teacher
Disc 01-01The Video Encyclopedia of Physics Demonstrations

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