- #1

- 208

- 0

so i take the derivative of the function which is (-1/R^2)dR/dt=(-1/R1^2)dR1/dt-(1/R2)dR2/dt

and then can calculate R to be 1/180 and i know R1, R2, and dR1/dt=.6 and

dR2/dt=.7

i get 5.052E-9 for dR/dt....which is not right

please help me

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter Rasine
- Start date

- #1

- 208

- 0

so i take the derivative of the function which is (-1/R^2)dR/dt=(-1/R1^2)dR1/dt-(1/R2)dR2/dt

and then can calculate R to be 1/180 and i know R1, R2, and dR1/dt=.6 and

dR2/dt=.7

i get 5.052E-9 for dR/dt....which is not right

please help me

- #2

Curious3141

Homework Helper

- 2,850

- 88

Your derivative is correct (except for the typo where you left out the square on the R2 term). Check your algebra, and it should work out.

- #3

AlephZero

Science Advisor

Homework Helper

- 7,002

- 297

1/80 + 1/100 does not equal 1/(80+100) = 1/180

.. and also the formula says

Share: