Calculating Density of a Submerged Object at 0°C | Check My Answer

  • Thread starter Thread starter trickymax301
  • Start date Start date
  • Tags Tags
    Density
AI Thread Summary
The discussion focuses on calculating the density of a submerged object that is 14% underwater at 0°C. The density of water at this temperature is stated as 999.87 kg/m³. The user initially sets up the formula to find the object's density but makes a minor error in the calculation process. A participant points out that the user correctly divided 14% by 100 but clarifies that the conversion should be treated as a ratio rather than a percentage. The final density of the object is confirmed to be approximately 139.98 kg/m³.
trickymax301
Messages
5
Reaction score
0
I believe I have correct answer, but I'd just like to confirm with others...

Question: What is the density of an object that is 14% submerged when floating in water at 0 degrees C?

density of water at 0 degrees C = 999.87, according to my book

So the formula I set up is...

((density of object)/(density of liquid)) x 100 = % submerged

Filling in the blanks...

((density of object)/(999.87)) x 100 = 14%

Divide the 14 by 100...

((density of object)/(999.87)) = .14

Multiply the density of water by .14 ...

(999.87)(.14) = 139.9818 = density of object

Have I solved this correctly? Thanks for looking this over!
 
Physics news on Phys.org
Looks OK except you do not multiply the density ratio by 100. You multiply by 100% = 100/100 = 1. When you divide 14% by 100 you get .0014. That is not what you did (fortunately). You divided 14% by 100% and got .14
 
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...
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...
Back
Top