Silly question

Lloyd Jones wrote:
How much would a person weighing 12 and half stone weigh on the moon.

(that's my weight)

LJ


The moon is 1/6th the gravity.

Going to google and searching "12.5 stones in pounds" gives me your
weight of 175 pounds.


1/6 * 175 = 29.167 pounds.

Now if we go back to stones with google because that's the unit you gave
me at first, putting "29.167 pounds in stones" says
29.16700 pounds = 2.08335714 stones


Therefore you would weigh 2.0834 stones on the moon.

Hope it helps

That's mad.

What about when your in a car say doing about 50 Mph. I heard that it
multiplies your weight many times haven't researched it though.

LJ

Lloyd Jones wrote:
That's mad.

What about when your in a car say doing about 50 Mph. I heard that it
multiplies your weight many times haven't researched it though.

LJ



Well 50 mph is still 50 mph. That's a speed. Speed is not affected by
gravity.

well in all fairness i think the engine wouldn't run as well because 1)
it doesn't have oxygen for your motor, 2) the fuel injection system
works on gravity, your car's computer is expecting fuel to be even at a
specific time. Gravity could slow that down.


Basically it works like this.

Mass is mass, it stays everywhere the same. So if you say your 10 kilos
or 10 slugs, its alwaise the same.

Weight is a force. 10 pounds is a force, to do that you just multiply
mass by the force.

Gravity is the amount of force that pulls you down.

On earth, the gravity pulls an object at 32 feet per second. That is
(if there is no air resistance), you keep on accelerating 32 feet for
every second you fall.

So like on earth:
time(s) speed(feet per second)
0 0
1 32
2 64
3 128


In actuality the air pushes against something falling so that there is a
'terminal velocity'. For a human sky diver its around 50mph if i remember.


Now on the moon we have 1/6th that. Note that it doesn't matter if you
weigh 1 oz or 1 ton, you will alwaise fall at this speed. If you drop a
hammer and a feather both at the same time, they will touch the ground
at the same time. But on earth the feather hits air and fly's thats why
it doesn.t If you do it with no air, you will see its the same.

So on the moon, 1/6 of the force of earth is:
1/6 * 32 feet per second = 5.35870517 feet per second. Lets say 5.

time(s) speed(feet per second)
0 0
1 5
2 10
3 15
4 20

You see it falls a lot slower, but it still falls. The moon isn't
pulling as hard on the object as on earth.

On 9/14/2004 16:21, F. Kuik wrote:


This question just come on the radio:

"What would a person that weighs 100 pounds weigh on mars"

LJ



Doing a Google on Mars and Gravity, I see that Mars has about 1/3
the gravity of Earth, so a person weighing 100 pounds on Earth
would weigh about 33 pounds on mars.


Isn't 100 pounds a mass? Masses dont change when you take em to mars right?
... The force on which the mass is pulled down in Newton would be less
ofcourse. So if someone on earth has a mass of 100 pounds and "g" is 9.8
he's pulled down by 980 Newton. This would be less on mars cause it's
constant "g" would be less.

Sorry. I used common sense to determine the question which I believed the
original poster was asking ;-)

"Lloyd Jones" wrote in message
...
This question just come on the radio:

"What would a person that weighs 100 pounds weigh on mars"

LJ


I've heard this joke before,

He would weight meat - he's a butcher

beavith wrote in
:

pounds are weight. slugs are mass (in english units)

Not quite. Pounds are either mass or force. Slugs are always mass and
poundals are always force.

kilograms are weight. newtons are mass (in mks)

But what do you mean by "weight"? People love to argue about this, but
the term weight is imprecise. It is used to refer to either force or
mass. It's a trick question. If you think of weight as downward force
due to gravity, then a 100 pound Earth person would weigh less on Mars.
If you think of it as mass, then a 100 pound Earth person still "weighs"
100 pounds on Mars.

--
Steve Gray

Lloyd Jones wrote:


What about when your in a car say doing about 50 Mph. I heard that it
multiplies your weight many times haven't researched it though.

Certainly not: 50 mph can't be reasonably considered a 'relativistic
speed'. In other words the relativistic effects of travelling at such
a small fraction of c (about 0.000,004) are practically
infinitesimal. You do gain kinetic energy, though, in proportion to
the square of your velocity, so for example a car doing 50 mph has
twenty-five times the kinetic energy as when moving at only 10 mph.

Take a one-tonne vehicle travelling at 30 m/s (about 67 mph): its
kinetic energy will be

E_k = (m*v^2)/2 = 1000 kg * (30 m/s)^2 / 2 = 450 kilojoules.

By Einstein's famous equation,

m = E/c^2 = 450 kJ / (3.0*10^8 m/s)^2 = 5*10^-12 kg = 5 nanograms,

so its kinetic energy is equivalent to a very insignificant
additional mass.

--
Odysseus

Barry Schwarz wrote in message ...
On Wed, 15 Sep 2004 01:35:10 GMT, beavith
wrote:

On Wed, 15 Sep 2004 01:21:06 +0200, "F. Kuik"
wrote:


This question just come on the radio:

"What would a person that weighs 100 pounds weigh on mars"

LJ



Doing a Google on Mars and Gravity, I see that Mars has about 1/3
the gravity of Earth, so a person weighing 100 pounds on Earth
would weigh about 33 pounds on mars.


Isn't 100 pounds a mass? Masses dont change when you take em to mars right?
... The force on which the mass is pulled down in Newton would be less
ofcourse. So if someone on earth has a mass of 100 pounds and "g" is 9.8
he's pulled down by 980 Newton. This would be less on mars cause it's
constant "g" would be less.


pounds are weight. slugs are mass (in english units)

True

kilograms are weight. newtons are mass (in mks)

Backwards


F=MA

lbs= slugs*ft/sec^2

kgs= newtons*m/sec^2

Also backwards


slugs are so useless, i'm digging deep into the memory banks to come
up with the weight equivalent. ummm. 32 pounds at earth gravity.

to the following posters, yeah, mars gravity is about 1/3 earth's.

33 pounds on mars. plus or minus.


Remove the del for email


Where is Donald Shead when we need him!

Double-A

I was waiting for someone to say that, but yes pounds are force and slugs
are mass.

Source "An Introduction to Mechanics", Kleppner and Kolenkow, p.65.

However... sorry, kilograms are mass and Newtons are force.

N=km*m/sec^2

"The kilogram is the mass of an international prototype of the kilogram. It
is a Pt-Ir cylinder deposited at the BIPM in Severs, near Paris."

Source "Handbook of Physics" Bennison, Harris, Stocker, Lutz, page 1125.
Meter, Kilograms, Second refers to Length, Mass, and Time.

You are XX kilograms no matter where you are in the galaxy.

BP
pounds are weight. slugs are mass (in english units)
kilograms are weight. newtons are mass (in mks)

F=MA

lbs= slugs*ft/sec^2

kgs= newtons*m/sec^2

slugs are so useless, i'm digging deep into the memory banks to come
up with the weight equivalent. ummm. 32 pounds at earth gravity.

to the following posters, yeah, mars gravity is about 1/3 earth's.

33 pounds on mars. plus or minus.

Only if you hit a wall at 35 mph then you are deceleration at around 25 Gs.
The weight increase is only when you get closer to the speed of light. That
would be done like this:

M(v)=Mo/Sqrt(1-v^2/c^2)

BP

"Lloyd Jones" wrote in message
...
That's mad.

What about when your in a car say doing about 50 Mph. I heard that it
multiplies your weight many times haven't researched it though.

LJ