Bungee question (3 Viewers)

[harry4]

how did u do the question with the bungee jumper. i got the first marks but not the part where x>L

 

[youngminii]

Did not attempt. Ahahaha fail

 

[kaz1]

I tried finding t. lol.

 

[study-freak]

Find the maximum value by differentiating

 

[untouchablecuz]

find dx/dt<br>find value of t for this (like 4.something i THINK)<br>find x at this time<br>if x is greater than (125-L-2) then he hits the water

 

[Dr. Zoidberg]

Yeaah, i did what study freak did, but i have a feeling that i still did it wrong. fail!

OMG!! didn't minus it by 125 and 2

Thought x was the displacement for the whole thing :S

 

[study-freak]

Yeaah, i did what study freak did, but i have a feeling that i still did it wrong. fail!

What answer did you get? whether or not the guy's head stays out or goes into water

 

[lolokay]

yeah differentiate it, to get the stationary points

pretty sure i made a numerical error (or multiple - to many numbers!) in there somewhere but I got about 119 as the minimum points

 

[study-freak]

yeah differentiate it, to get the stationary points

pretty sure i made a numerical error (or multiple - to many numbers!) in there somewhere but I got about 119 as the minimum points

minimum?
I thought it was maximum (couldn't be bothered to check it)

But anyway, the number I got seems similar to, if not the same as, yours.

 

[Dr. Zoidberg]

What answer did you get? whether or not the guy's head stays out or goes into water

I got stays out

I got 12x m (where is some number lol)

But i forgot to minus it by 125 and 2 :S cuz i thought displacement for the second part was for the whole thing

Zoidberg never fails

Ugh, dumb Q but why differentiate? I was about to take the limiting value of t but saw it was 4 marks so i thought it must be something harder.

HAHa, That's true for human anatomy ;P

And yeah, differentiate to find max displacement

 

[study-freak]

I got stays out

I got 12x m (where is some number lol)

But i forgot to minus it by 125 and 2 :S cuz i thought displacement for the second part was for the whole thing



HAHa, That's true for human anatomy ;P

And yeah, differentiate to find max displacement

I got the same, except I'm not sure about the number.

 

[lolokay]

minimum?
I thought it was maximum (couldn't be bothered to check it)

But anyway, the number I got seems similar to, if not the same as, yours.

sorry, I meant the minimum height, which corresponds to the maximum displacement

 

[untouchablecuz]

wait, you had to test the nature of the points

i went on the physical interpretation that when the rope begins to retract, theres a moment where v is zero

 

[lolokay]

wait, you had to test the nature of the points

i went on the physical interpretation that when the rope begins to retract, theres a moment where v is zero

I didn't bother with testing the points. I just said something like "the first stationary point corresponds to the maximum length of the rope", but I don't think I will get full marks for this question

 

[untouchablecuz]

i got he goes into the water, like

42m under the water LOL

 

[Dr. Zoidberg]

i got he goes into the water, like

42m under the water LOL

LOL! he know he dead

 

[harry4]

i don't understand why you have to differentiate in the first place

 

[lolokay]

i got he goes into the water, like

42m under the water LOL

lol

not a nice question. calculations have no place in a mathematics exam!

 

[Aerath]

i got he goes into the water, like

42m under the water LOL

I got worse....I got like 77m deaded.

 

[eldore44]

I didnt work it out properly. I just said 125 = some equation with t.
Then said that if t =3pi/4 125< some equation with t. therefore will go into water. pretty sure its almost completely wrong.