Physics experts: How do you measure gravity without time?

Question

all you have is:

-a long pipe with a valve at the end that dispenses water in drops (buret)
- a meter stick

-clamps, ring stand etc (not important)

thats it, now confirm what we already know: acceleration due to gravity is -9.81 m/s/s

the problem for me is, there is no way to measure time, therefore we cannot find time or final velocity.

Answer 1

OK I'm assuming a very long pipe (more than 10 meters) and the knowledge of the atmospheric pressure (101,325 pascals) and the density of water (1g/cc or 1000Kg/m^3). I had both of these memorized so I think this is fair.

Fill the tube with water. Turn it upside down. The force of the water pushing downward is
F=mg=volume*density*g

And the force of atmosperic pressure upwards is
F=pressure*area

so we have
pressure*area=volume*density*g

or pressure=height*density*g

g= 101,325/height/1000=101.325/height

the height will be a little more than 10 meters, giving you the standard value for g.

I think the word "long" in the question was meant to be a hint.

Answer 2

Just considering anything is referred to as a conception doesn't suggest there is not overwhelming proof to help it. Sure, we do not appreciate the targeted mechanisms of gravity but, however we are running on it, and we certainly will one day, even one day quickly. But simply considering we do not totally appreciate it doesn't suggest it does not exist and paintings flawlessly good in all circumstances. Wow. OK. Read the primary put up there. I did not learn the leisure, however here is a reaction from an specific physicist - me. one million) Yes, there's gravity in house. Any huge item has gravity, which decreases as you progress clear of it. But regardless of how some distance away you're, it has an infantesimal pull. Nearer gadgets have a higher pull. two) The Moon and satellites are held in orbit through gravitational enchantment. They are in steady orbits because of their velocities across the item they're orbiting. three) This men is absolutely both kidding or an fool. No scientist can reply those questions? We've understand this for countless numbers of years. Someone demands to return to 3rd grade.

Answer 3

I believe you are correct, it is impossible to make an instantaneous measurement of the force of gravity. Even if you had a known mass and a calibrated instrument for measuring force, it would take time for the instrument reading to settle, and for you to take a reading.

If you relax the instanaeity requirement, and allow time and a method to measure the acceleration of the water drops, you can measure g. But do it quickly, before the drops approach their terminal velocity.

Answer 4

True.... but you could let the water drip out at a rate of 1 drop per second and therefore have a clock. ;))