Conservation of energy problem.

AI Thread Summary
The discussion revolves around a conservation of energy problem, with specific focus on parts #7 and #8 of the homework assignment. The user shares links to images of the problems and their attempts at solutions, seeking feedback on their approach. There is uncertainty expressed regarding the correctness of the answers provided for both parts. The urgency of the deadline is noted, as the user plans to review responses before submitting. Overall, the thread highlights a collaborative effort to clarify understanding of energy conservation concepts in physics.
the whizz
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Homework Statement



problem is here

http://img151.imageshack.us/img151/1675/question7ql6.th.jpg http://g.imageshack.us/thpix.php

Homework Equations


The Attempt at a Solution


for the #7 part

http://img232.imageshack.us/img232/9079/problem7answerqq9.th.jpg http://g.imageshack.us/thpix.php

and for #8 here is where i wasnt too sure i was on the right track.

http://img222.imageshack.us/img222/1459/problem8answerth8.th.jpg http://g.imageshack.us/thpix.php
 
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due tomorrow...going to bed would like to see if I am on the right track.
 

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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