How Far is the Center of Mass from the Center of a Square with a Circular Hole?

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AI Thread Summary
The discussion revolves around calculating the distance between the center of mass and the center of a square sheet metal with a circular hole cut out. The square has sides of 20 cm, while the circular hole has a diameter of 10 cm. Participants encourage the original poster to show their attempts and identify where they are struggling to facilitate better assistance. The use of moments is suggested as a method to solve the problem. The conversation emphasizes collaborative problem-solving in physics.
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Welcome to PF!

Hi kalemi19! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help!

(use moments :smile:)
 

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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