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Author Topic: How Does Astro The Astronaut Check His Weight ?  (Read 12962 times)

Offline Soul Surfer

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How Does Astro The Astronaut Check His Weight ?
« Reply #25 on: 15/05/2008 17:30:16 »
He has a specially designed scale with a weight on a rope and a spring. He  straps this to himself and moves into the centre of his spaceccraft and releases the weight which accelerates away from him and pushes him backwards  eventually the weight reaches the end of the string and he and the weight stop with a jolt and the scales by masuring the time it took to reach the end of the string and the strength of the spring and mass of the weight can calculate the astronaut's weight.
 

Offline Make it Lady

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How Does Astro The Astronaut Check His Weight ?
« Reply #26 on: 15/05/2008 21:47:08 »
Astro would have to keep himself toned in space especially if he is spending a long time up there. I guess he would need to keep track of his body mass to check on his muscle deterioration.
 

Offline Make it Lady

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How Does Astro The Astronaut Check His Weight ?
« Reply #27 on: 15/05/2008 22:04:00 »
Try this out. It shows the oscillating seat that Astro has to sit on every morning....oh! good vibrations.

www.usatoday.com/tech/columnist/aprilholladay/2005-02-04-wonderquest_x.htm
 

Offline turnipsock

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How Does Astro The Astronaut Check His Weight ?
« Reply #28 on: 15/05/2008 22:40:53 »
Don't they just use a big Inertia Balance?

Quote from: somewhere
Description: The inertia balance is designed for use in a laboratory experiment in which mass is quantitatively measured independent of the earth's gravitational force. This same method is used in determining the mass of an object under weightless conditions in space flights.
The apparatus consists of two small platforms connected by two horizontal, nonsagging, spring-steel blades. A cylinder with a shoulder on which it can rest in a hole in the platform and a hook by which it can be suspended are included. This cylinder may be used as an object of unknown mass.
 

Offline LeeE

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How Does Astro The Astronaut Check His Weight ?
« Reply #29 on: 16/05/2008 00:50:26 »
Heh - mass is a concept that everyone knows about but it's inertia that everyone actually knows.  'Weight' is just a distraction that only occurs when you've got two bodies, which admittedly is what applies to most people.

You could use an ordinary set of bathroom scales to measure the 'weight' of astro.  What a set of bathroom scales does isn't really measure a weight but apply a force that is calibrated to the Earth's gravity.

So stick astro on the scales and then accelerate the scales (including astro) at one Earth 'g' to just read off his 'weight'.
 

Offline turnipsock

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How Does Astro The Astronaut Check His Weight ?
« Reply #30 on: 16/05/2008 01:02:17 »

So stick astro on the scales and then accelerate the scales (including astro) at one Earth 'g' to just read off his 'weight'.


doh! I wish I had thought of that. Wouldn't that affect his orbit though?
 

Offline LeeE

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How Does Astro The Astronaut Check His Weight ?
« Reply #31 on: 16/05/2008 14:29:36 »
Erm... yes, it would, although the period of time that astro needs to be accelerated isn't a factor so it could be very small, resulting in a very small change of velocity.

But if we assume this is all done inside a space vehicle, the net change will be zero, at least once he bounces off the wall.

Alternatively, he could be accelerated and then deccelerated.
 

Offline turnipsock

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How Does Astro The Astronaut Check His Weight ?
« Reply #32 on: 16/05/2008 16:44:01 »

Alternatively, he could be accelerated and then deccelerated.


What! Like in an inertia balance you mean?
 

Offline LeeE

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How Does Astro The Astronaut Check His Weight ?
« Reply #33 on: 17/05/2008 21:53:14 »
Oh, is that what they're called? ;D
 

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How Does Astro The Astronaut Check His Weight ?
« Reply #33 on: 17/05/2008 21:53:14 »

 

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