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“Moon Gravity” Experiment Analysis

“Moon Gravity” Experiment Analysis. Peter Reinhardt. Original Purpose. Detect Moon via fluctuations in gravity Expected a sine wave with an amplitude of a few 100 micrograms for a ~100 gram mass. Oops. Expected amplitude was off by 10^6 Gravity fluctuations are nearly unmeasurable.

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“Moon Gravity” Experiment Analysis

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  1. “Moon Gravity” Experiment Analysis Peter Reinhardt

  2. Original Purpose • Detect Moon via fluctuations in gravity • Expected a sine wave with an amplitude of a few 100 micrograms for a ~100 gram mass

  3. Oops • Expected amplitude was off by 10^6 • Gravity fluctuations are nearly unmeasurable

  4. What causes the variation in weight? • Room temperature? • Lighting? • Air currents? • Power fluctuations? Note: Overall fluctuation is about 0.001%

  5. Weekly Fluctuations • Very flat on weekends • 8-hour spikes become more noticeable • Daily fluctuations on school days

  6. Weekly Conclusions • Weekend/school day differences suggest heating causes the large fluctuations • Lighting and power fluctuations are not terribly different between the two types of days • Air currents are unlikely to be as consistent as the data trends

  7. Daily Fluctuations • Level during early morning • Low during day • High after school

  8. Daily Conclusions • Morning: Heat comes on, spring warms and softens slightly • Afternoon: Heat turns off, spring cools and hardens slightly. Micro-dew forms on the copper. • Late night: Micro-dew slowly evaporates.

  9. 8-hour Spikes • Very regular, 8 hour 10 minute period • Power fluctuations? • “Smart Energy is an industry poised for significant growth because of growing demands for "premium power" (electricity free from fluctuations and interruptions) “

  10. Long term trends • Measured mass slowly falls from 103.1335 to 103.1330 over the 50 day period • Spring stretching? • Copper “evaporating”?

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