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The thread on the semi diurnal variability of g raised by Anthony was
quite animated. It needs only a mention of the twice daily change of
force per mass: corresponding to about 10 mg for a 100 kg mass - a
little beyond the resolution offered by the usual scale.
Brian Whatcott Altus OK
On 12/10/2014 10:11 AM, David Bowman wrote:
A) Any possible solar tidal effect will be essentially the same atmidnight as at noon (to leading order in the multipole expansion, i.e.
ignoring higher order multiple effects). Any diurnal solar tidal
discrepancy will be maximum between either midnight/midday and either
sunrise/sunset.
B) The lunar tidal effect is about 2.5 times stronger than the solarone.
Anthony Lapinski
David Bowman
-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@www.phys-l.org] On Behalf Of
Sent: Wednesday, December 10, 2014 8:04 AM(with the Sun above you and pulling opposite to Earth's gravity), and
To: phys-l@phys-l.org
Subject: [Phys-L] apparent weight
If you stand on a sensitive scale, will you be slightly lighter at noon
slightly heavier at midnight (with the Sun below you and pulling in the
same direction as Earth's gravity)? Ignore any lunar effects.
said no because the Earth is in freefall around the Sun, and it is the
This came up the other day, and nobody could really agree. One side
Earth that pulls us to it. The other side said yes due to tidal effects
as seen in the oceans.
I searched online, and found the same conflicting arguments!
Can anyone help with this?
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