JulesMaximus
No Lifer
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Zenmervolt
Elite member
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JulesMaximus
No Lifer
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You would have to know the exact force of gravity at the location the baby is being weighed, and then know the conversion factor between that and the earths gravity. I believe even in earths orbit, the earth still exerts a gravitational force, so you would just have to somehow measure that, and calculate the earths gravitational pull at the surface.
Then again I could just be full of shit.
Then again I could just be full of shit.
RedRooster
Diamond Member
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JulesMaximus
No Lifer
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MrPickins
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Your 2nd premise is correct and many are too ignorant to know this fact: an object in orbit (around the Earth in this case) is kept in orbit by gravity. (For brevity, I'm ignoring Einstein's GR in which gravity is a fictional force.)
If the Earth had a gravity "on-off" switch, and some foolhearty person switched the switch to the "off" position, all objects orbiting the Earth would fly off in a tangental direction. Gravity keeps the object in orbit, but the object is always falling towards the Earth which results in freefall, and the feeling of weightlessness. As an analogy, suppose you are standing on a scale in an elevator when all the cables snap and the elevator plummits downward. Looking at the scale in the falling elevator, you discover you now weigh nothing! (Or close to zero as air friction and elevator guide friction will retard your acceleration a bit.)
Your first premise ignores the fact that the object (baby in this case) is in freefall, but the basic idea can be done; there are satellites in orbit around the Earth measuring minute differences in surface gravity.
Strap the baby to one end of a long pole, and attach weights at the other. Spin the pole. When the axis of rotation is exactly between the center of mass of the baby and the weights, the mass at each end is equal. You could also use any old known mass, determine the distance between the axis of rotation and the baby, and the axis of rotation and the known mass, and do the math.
DrPizza
Administrator Elite Member Goat Whisperer
You could use an inertial balance...
here
That site explains how they're used.
Alternatively, you can measure the volume of the baby in a variety of ways and assume the density of a baby is approximately that of water.
Note: depending on the size of the inertial balance you use, it could lead to quite a bit of oscillating mostion for the baby, leading to the baby spitting up the milk and mashed peas it had for lunch. It's pretty gross in gravity environments; I'm thinking it may be grosser in zero gravity environments.
here
That site explains how they're used.
Alternatively, you can measure the volume of the baby in a variety of ways and assume the density of a baby is approximately that of water.
Note: depending on the size of the inertial balance you use, it could lead to quite a bit of oscillating mostion for the baby, leading to the baby spitting up the milk and mashed peas it had for lunch. It's pretty gross in gravity environments; I'm thinking it may be grosser in zero gravity environments.
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