Q13 (3 Viewers)

[RishBonjour]

i got 22hrs 46min for d)ii)

I got 22.something aswell. I subbed in 20, 21, and 22 to check, 22 was correct --> closest to 0.

 

[Timske]

I got 22.something aswell. I subbed in 20, 21, and 22 to check, 22 was correct --> closest to 0.

same

 

[Kieran95]

what did you guys get for 13.c.ii

This. How do you do it?

 

[Nooblet94]

Just checked on wolframalpha and it's 22 something. Ugh.

 

[Timske]

This. How do you do it?

was this the approximation question?

 

[Kieran95]

was this the approximation question?

13cii ) When is the displacement of the particle zero for the first time?

 

[GoldyOrNugget]

I got t=1.511.

 

[RishBonjour]

Just checked on wolframalpha and it's 22 something. Ugh.

dw man. silly mistakes.. fml. (I got 2 so far)

 

[GoldyOrNugget]

RishBonjour same here =\ what external mark do you reckon 68/70 will get?

 

[Peter-PF7]

Was i the only one that use 't-formula' for part a lol?

 

[RishBonjour]

RishBonjour same here =\ what external mark do you reckon 68/70 will get?

68/70 raw? ==>99 buddy!

 

[TheOptimist]

68/70 raw? ==>99 buddy!

nice

 

[kliro_10]

i got 26hours 40mins for 13dii. anyone ?

 

[osak23]

for cii) i got some shitty figure but rounded off to 2 d.p : 1.5 s

for d) i) 5 hours
ii) i just did 1 application of newtons method and got t=25hrs???
i think its wrong..didnt get wtf the 0.3mg/l is?

will i get a mark for doing 1 application of newtons though??

 

[kliro_10]

 

[Kieran95]

I got t=1.511.

How do you actually do it though? I used x = Ancos(nt + alpha) but im guessing that probably wrong. From memory alpha ended up being inverse tan(-4/3) ?

 

[RishBonjour]

How do you actually do it though? I used x = Ancos(nt + alpha) but im guessing that probably wrong. From memory alpha ended up being inverse tan(-4/3) ?

I think it was Ancos(nt - alpha) and you should get 1.511.
(although you could do it with sine, doesn't matter)

 

[mike12345678]

i got 26hours 40mins for 13dii. anyone ?

yeaa i got something like this aswell. but i guess where wrong... according to everyone else

 

[kliro_10]

yeaa i got something like this aswell. but i guess where wrong... according to everyone else

check it out above, i typed it into wolfram alpha and the answer came to 26.66666.. = 26 hrs 40 mins

 

[jennnnnnn]

check it out above, i typed it into wolfram alpha and the answer came to 26.66666.. = 26 hrs 40 mins

you have to minus 0.3 in the equation