- #1

- 212

- 0

this is my work

Let l=l(t) be the length of each edge at time t

then volume = l^3

dl/dt = 8.8cm/h = .088m/h

dV/dt = dV/dl * dl/dt

= 3l^2 * .088 m/h

at l = 5

dV/dt = -6.6m/h

where have I made an error?

thanks

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- Thread starter Destrio
- Start date

- #1

- 212

- 0

this is my work

Let l=l(t) be the length of each edge at time t

then volume = l^3

dl/dt = 8.8cm/h = .088m/h

dV/dt = dV/dl * dl/dt

= 3l^2 * .088 m/h

at l = 5

dV/dt = -6.6m/h

where have I made an error?

thanks

- #2

Dick

Science Advisor

Homework Helper

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I don't see any problem except the units. volume/time isn't m/h.

- #3

HallsofIvy

Science Advisor

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- #4

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sorry i put in -6.6m^3/h

thats just a typo

i'm still getting the wrong answer?

thats just a typo

i'm still getting the wrong answer?

- #5

Dick

Science Advisor

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Why do you think the answer is wrong?

- #6

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inputting it for an assignment online and getting an "incorrect" response

- #7

Dick

Science Advisor

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- #8

cristo

Staff Emeritus

Science Advisor

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Have you checked the units the online thing wants the answer in?

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