Help me to figure out how this equation is derived

Thread starter physiker99
Start date Dec 9, 2008
Tags

Figure

AI Thread Summary

The discussion focuses on understanding the derivation of an equation related to time (t) in a specific problem. The user expresses confusion about how the solver arrives at the equation presented in line 5 of part b, referencing the first four lines as sufficient context. The equation involves the relationship Rω = at, which is used to solve for t in line 2. Clarification is sought on the transition from these initial equations to the final form. The conversation emphasizes the need for a clearer explanation of the mathematical steps involved.

Dec 9, 2008

physiker99

Hello, I just couldn't understand how solver comes up with the equation at line 5 of the part b. (equates t (time) to other variables). I think the first 4 lines are enough to figure out this equation so i am not posting the question. i will be grateful if you'd help me.http://www.cramster.com/Answer-Board/Image/200863929416334808218196100003057.jpg

Last edited by a moderator: Apr 24, 2017

Physics news on Phys.org

Dec 9, 2008

Avodyne

Science Advisor

He uses R\omega=at (line 3) in line 2, and solves for t.

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...

View full post »

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...

View full post »

Thread 'Explain this asphalt sheen'

This problem is two parts. The first is to determine what effects are being provided by each of the elements - 1) the window panes; 2) the asphalt surface. My answer to that is The second part of the problem is exactly why you get this affect. And one more spoiler:

View full post »