Torque (of a couple) and centre of gravity MCQ

AI Thread Summary
The discussion revolves around understanding the concept of torque, specifically in relation to a couple and the center of gravity. The participant expresses confusion about calculating the torque exerted by the weight of a cube about a specific axis. Key points include the formula for torque of a couple, which involves one of the forces multiplied by the distance between them. The conversation highlights the importance of analyzing forces and torques acting on a stationary object. Clarification on these concepts is sought to solve the homework problem effectively.
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Homework Statement



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Homework Equations



I know torque of a couple = One of the forces x the distance between the 2 forces.

The Attempt at a Solution



I don't know how to approach this blasted problem. Any help would be very much appreciated.
 
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What torque does the weight of the cube exert about that axis?
 
What do you know about the forces (or torques) acting on an object that isn't moving or which you don't want to move (or rotate)?
 

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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