Question

A fuse has a length of 10 meters and burns at a rate of two centimetres per second when lit. What length of fuse (in cm) remains after t seconds and when will it totally burned out?

Answer 1

@amistre64, @Hero

Answer 2

Hint:

D = rt

Answer 3

can we use calculus?

Answer 4

You should always try to solve a problem without calculus if it isn't necessary

Answer 5

would it not be something like 10-0.02t

Answer 6

it burns at a rate of 4 cms; so im sure we can if we need to

Answer 7

2cm*s^-1

Answer 8

for some reason i read it as lit at both ends lol

Answer 9

D - rt = 0

Answer 10

right, so 10m - 0.02cm*s^-1*t

Answer 11

D=10m - 0.02cm*s^-1*t

Answer 12

\[\frac{df}{dt}=-.02\]
\[f(t)=-.02t+C\]initial condition f(0)=10

Answer 13

right, so when will it be totally burned out?