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Why the weight of a 16 ounce pint of liquid varies

Why the weight of a 16 ounce pint of liquid varies - Physics Forum

Why the weight of a 16 ounce pint of liquid varies - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 03-14-2005, 03:47 AM
Don1
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Default Why the weight of a 16 ounce pint of liquid varies



Most of you already know that the weight of a 16 ounce pint of most
water like liquids varies at various locations. This is for those who
may not know that it does or why it does:

The weight of a fluid pint here on Earth is about one pound, or 16
ounces; but only where it will free fall at a rate of g/2=16'/sec^2*,
which is the approximate rate of free fall due to gravity over most of
Earth's surface: Therefore the "quantity of matter", or mass in one
fluid pint numerically equals g/2=16 oz/(16'/sec^2)=1 oz sec^2/foot.

In an environmentally controlled laboratory on the moon, a fluid pint
will only weigh about one sixth of a pound, or about 2.67 ounces:
Because the rate of free fall (g/2) due to gravity there is only about
one sixth as great as it is on Earth: So that g/2=2.67'/sec^2. The
"quantity of matter", or mass in one fluid pint there is still
numerically equal to 2.67 oz/(2.67'/sec^2)=1 oz sec^2/foot; the same as
it was on Earth.

In an environmentally controlled laboratory on any similar planet with
a solid stable surface, the quantity of matter, or mass in a fluid pint
will still be 1 oz sec^2/foot: Because its weight (w), divided by the
rate of free fall (g/2) due to gravity there will still be 1 oz
sec^2/foot.

This can be put into a simple mathematical formula as (m)=2w/g=2f/a= _A
Constant_ :: So that f=2(m)g=2(m)a ....

*Notice that this _rate_ is only one half of the _acceleration_ due to
gravity!

Don

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  #2  
Old 03-14-2005, 07:31 AM
Double-A
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Default Why the weight of a 16 ounce pint of liquid varies


Don1 wrote:
of
about
as
with
pint
_A
to


I have indeed noticed that the weight of a 16 ounce pint pocket flask
does decrease in weight as the night goes on. But I don't if this has
anything to do with gravity.

Double-A

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  #3  
Old 03-14-2005, 12:21 PM
Don1
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Default Why the weight of a 16 ounce pint of liquid varies

Double-A wrote:
who
g/2=16'/sec^2*,
sec^2/foot.
pint
same
the
(m)=2w/g=2f/a=
has

Quit messing around; be serious.

Don

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  #4  
Old 03-14-2005, 02:15 PM
Double-A
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Posts: n/a
Default Why the weight of a 16 ounce pint of liquid varies


Don1 wrote:
most
16
most
one
The
fluid
due
flask

How can I be serious, Don, when all you do all day is mess around with
people's minds and never get serious. You make molehills into
mountains, and trivialize things that are important. But that's OK
with me; it creates conversation. But we all know about how things
weigh differently on the Moon. We don't need you to explain it to us
over and over again. But if you could come up with some funny come
back quips, that would be OK.

Double-A

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  #5  
Old 03-14-2005, 02:51 PM
Don1
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Default Why the weight of a 16 ounce pint of liquid varies

Double-A wrote:
those
fluid
ounces:
only
planet
by
this
with

You've got to think of the people that don't have your high degree of
indoctrination AA. They may _want_ to know about how things weigh
differently on the Moon. Your snappy come back quips can be gotten
anywhere. All they do is distract from the subject, and that's why I
have to do it over and over again.

Give us all a break: Quit messing around; be serious.

Don

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  #6  
Old 03-17-2005, 02:05 AM
Double-A
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Posts: n/a
Default Why the weight of a 16 ounce pint of liquid varies


Don1 wrote:
of
or
over
in
g/2=2.67'/sec^2.
still
the
divided
oz
_acceleration_
us


I know......., until we get it right!

Double-A

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