Discovery Homework Help Kiosk!

[jxie93]

I'm stuck at a Physics practice question I got recently and I'm quite frustrated. I thought I might give this a try even though it hasn't been active for the past couple of months. Here it is.

A solid winding drum around which a rope is wound has a mass 5kg, a radius 0.1m and is attached to a turning wheel in the form of a disc of mass 2kg and radius 0.5m. When a 5kg bucket, tied to the rope, is dropped from rest it takes 10s to reach the water 40m below. The rope and handle have negligible masses.

Calculate the frictional torque at the axle of the winding mechanism.

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[Chev]

Epic grave digging is epic. I want to know, is this one still works? I pretty need some help with my Maths.

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[ugliestmoose]

Epic grave digging is epic. I want to know, is this one still works? I pretty need some help with my Maths.

Well it's pinned so yeah I guess it still works. What's your question?

[Chev]

Here:
Maths homework
I'll update it. Since there's some lowercases and stuffs, I made it in external link. Any help appreciated.
Thank you.

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[Strichev]

Would anyone want to solve this equation step by step?

9*(x*x+8)=8*(1+6x)

It's simple, however for some reason I can't solve it. Hurry, I'm running low on time.

Oh and the result is:

8/3

I just can't find a way to solve it on my own...

[Jason]

Would anyone want to solve this equation step by step?

9*(x*x+8)=8*(1+6x)

It's simple, however for some reason I can't solve it. Hurry, I'm running low on time.

Oh and the result is:

8/3

I just can't find a way to solve it on my own...

Simple polynomial with the use of quadratic formula.

9(x^2 + 8) = 8(1 + 6x)

> expand both sides

9x^2 + 72 = 8 + 48x

> equate to zero

9x^2 - 48x + 64 = 0

> quadratic formula

x = (-b +/- (b^2 - 4ac)^(1/2))/2a

x = (48 +/- ((-48)^2 - 4(9)(64))^(1/2))/2(9) = (48 +/- 0)/18 = 48/18 = 8/3

[Sly]

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