# HW help requested (Tension, Circular motion, Work and Energy Theorum)

1. Oct 10, 2012

### Burnenator

I have attempted each problem, but am getting lost on just what to do to solve. If i could be pointed in the right direction on how i should go about each problem that would be nice. Attached are my attempts at problems 1-3.

1. The problem statement, all variables and given/known data
SEE ATTACHMENT

3. The attempt at a solution
See attatchments for attempts at first 3

attempt at problem 4

M = .150kg D = .65 m
F(x) = 15000 + 10000x -25000X^2
A) work done = ∫F(x)dx = ∫15000 + 10000x -25000X^2 dx
= 15000x + 5000x^2 - ((25000x^3)/3) bounded from 0 to 65 = -9572 Joules

I only need help with part A for problem 4. I feel like i had to have done something wrong or i approuched the problem wrong because a negative answer doesn't seem to make sense.

#### Attached Files:

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• ###### Attempt at Problem 3.jpg
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15.1 KB
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39
Last edited: Oct 11, 2012
2. Oct 10, 2012

### voko

The problem is inaccessible, the server requires a username and a password.