Measuring Density of Swimming Pool Water - Tips & Equations

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Various methods for measuring the density of swimming pool water include using a mass and volume approach, where the mass of a known volume of water is measured. The discussion highlights the importance of knowing the volume of the water sample to calculate density accurately. Additionally, hydrometers are suggested as an alternative method for measuring density. The conversation emphasizes the need for precise measurements to ensure accurate density calculations. Overall, understanding these methods is crucial for effective density measurement in swimming pool water.
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Homework Statement


What are the various methods of measuring the density of a swimming pool water sample.


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The Attempt at a Solution


I thought the best way of measuring the density would be to fill a tube which you know the mass of with the liquid, then subtract the original mass of the tube and it would give you the density of the liquid. Am I correct? Please help me, thank you!
 
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You're right so far. Make sure that you know the volume that the water takes up.
 
Thank you, but what other methods are there to measuring density?
 
Look up hydrometers.
 
Thank you very much gentlemen, you have been brilliant, many thanks!
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
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Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
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