Expanding space?

The one cooked in the microwave tastes like crap. Seriously, do not cook a roast in the microwave. That's nasty.

 

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Yeah, and not only that, it will be grey and unappetizing-looking. Yuck! Unless it has a built-in electrical heating element to brown it.

 

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If the planet is rotating, you should be able to detect a coriolis force somehow (I'm not sure what device you might use).

To be honest, I think he understands perfectly. He just won't admit it, and he likes to argue.

 

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:thumbsup: Good on you. I should have covered my ass better...I realized that after I posted... yes there are ways to tell if you that you are probably on a planet... but the fact that you have to resort to measuring something unrelated to the acceleration just goes to show you anyway.

 

Neither would likely help him. A planet with only 0.1g is not likely to have an atmosphere (there goes his cloud chamber) nor a magnetic core (there goes his compass).

 

Ok,

A non-gravitational acceleration will produce a uniform force across the box, whereas a gravitational acceleration due to a spherical planet will produce a force that deviates from normal (vertical) everywhere but the centerline of the box. It might take an extremely sensitive plum-bob to measure it, but it's there.

EDIT:

So I ran the numbers and if your box was a 10m cube then, on the earth, the deflection from vertical over a 10m plum-bob at 5m off the center line would be about 8um. I think a laser measuring device could do this.

 

I really wish there was a simple sketch feature in this forum.

 

Yes, but my praise was in response to his response to my question which specifically mentioned the Earth.

I am trying to set an example, whereby if one of us admits he is right once in a while, maybe it will rub off on him.

 

I've done that a couple of times with him. He has some kind of force field or something...

 

Yes, you are correct of course, super. I would think another way to differentiate between uniform acceleration and normal gravitational acceleration is by using a large box, say one several hundred kilometers square. The force measured in an accelerating box will be identical everywhere within the box and the plumb-bob lines will all be vertical, whereas within such a large box sitting on the Earth, one would measure a difference in gravitational potential between the top and bottom of the box, as well as plum-bobs that are seen to converge from the sides.

 

Right you are.

 

And in that spirit, I should mention that he already pointed out your answer to the problem as well (...I think that's what he meant, anyway):

 

No... I read that and that's not what I took it to mean at all.

On any scale all of the earth attracts us. What else could this mean?

And by implication, what???

I really can't understand this.

 

Ah, yes - thank you.

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I had thought of something quite similar but since the conditions, as stated, involved a 10-meter box and and 0.1g (I think), the deviation would be so small I was guessing it would be undetectable.

 

I have never used one but I am told that browning dishes work very well.

 

Of course I like to argue. Questioning anything is the best way to learn. The air you are breathing would also tell you if you were in a rocket ship since it would not contain the casual impurities Earth's astmosphere does.

 

Our Moon has a G force about 0.16G so not a planet if it only has 0.1G. I would think around 0.25G would be the minimum for what we would recognise as a planet?

 

You could try scanning one into your computer, putting it on photobucket (or similar) and so putting the image here.

 

I've never understood why the effort to try and prove someone wrong rather than just posting what you believe/know to be right. Of course gravity in a room on Earth would be mimicked by being in a spaceship accelerating at 1G, the same as infra-red and microwaves while different can heat something up.

 

Uh huh.