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Measuring the mass of
an astronaut
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TP
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TP
Doppler Effect
(red shift et bleu shift)
rotation period of Mercury
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TPMeasure of the differential rotation
of the Sun by observing solar spots
Δ
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TPRemote
sensing
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The mass of a black holeTP
Elliptic motion (a)
Period (T)
3°Kepler law
Reference star
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TP
http://eoedu.belspo.be/fr/profs/index.htm
Huriccane speed
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Boyle et Mariotte
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TP
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freefall study
(T48) Matteo Siccardi: Apllet Geogebra
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Screencasting
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Measuring the mass of an astronaut
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Why measuring the mass?
• For the look ?
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Why measuring the mass?
• osteoporosis ?
zero gravity
weightless
environment
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Why measuring the mass?
• For EVA (Extra Vehicular Activity)?
spacesuit
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Problem?
zero gravity
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Harmonic motion
harmonic oscillators
A suspended from a spring
(translation oscillator) object
can oscillate on either side of
an equilibrium position.
0
- Max
+ Max
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All periodic oscillating movements "can be assimilated" to the projection on an axis of
a turning point X at constant speed on a "trigonometric" circle of radius R = Max.
0
- Max
+ Max
yy
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: angular speed (rad/s)
t: time (s)
: angle
= .t
y=Y.sin( )
Where:
Y: amplitude
: pulsation
.t: phase
y: gives the position, the value of an electric field, pressure, ....
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It is possible to calculate the speed at which the position varies, the electric field or
pressure, ... during a time interval t.
We can also calculate how the speed varies during time interval t.
To get an accurate speed and instant acceleration, just use a very small t that the limit
tends to zero, or just take the derivative with respect to time.
The speed
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L’accélération
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Dynamics of the harmonic oscillator
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remark:
The time (and therefore frequency) is independent of the amplitude (A)
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Spring constant
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Force sensor
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