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[OCR A] A-Level Further Mathematics: Mechanics 18th June 2019

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Reply 20

DragonsOfAsshai

I got r/8(3*3^0.5+11^0.5) for the 11 marker

Reply 21

Backtoearth21

Did you do Tcos + Rsin theta and Tsin theta - Rcos theta?

Original post by DragonsOfAsshai

Really? I got 2.48 as well

Reply 22

Snow wang

Sorry,8.833333

Original post by Snow wang

Reaction force is 8.33333...,direction away the surface

Reply 23

DragonsOfAsshai

Original post by Gabzinc

I cant remember what I got for that. What was your reactions force?

I got 53/6

Reply 24

Snow wang

Same

Original post by DragonsOfAsshai

I got 53/6

Reply 25

Gabzinc

I genuinely can't remember my answer - any other details?

Reply 26

DragonsOfAsshai

Original post by Gabzinc

I genuinely can't remember my answer - any other details?

Then for radius of rotation I got 2.1m

Reply 27

Snow wang

Yes, I use these.

Original post by Gabzinc

I cant remember what I got for that. What was your reactions force?

Original post by Backtoearth21

Did you do Tcos + Rsin theta and Tsin theta - Rcos theta?

Reply 28

DragonsOfAsshai

What did people get for the 11 marker though?

Reply 29

deanyang123

What was the value for the tension of the cone questions was it 30.6N?

Reply 30

DragonsOfAsshai

Original post by deanyang123

What was the value for the tension of the cone questions was it 30.6N?

I got 24N from 32/2 * 1.5

Reply 31

Gabzinc

Original post by deanyang123

What was the value for the tension of the cone questions was it 30.6N?

How on earth did I calculate tension incorrectly fml
I'm probably not getting any marks unless there is ecf for the second part

Reply 32

username4567470

I think it was just 24N

Original post by deanyang123

What was the value for the tension of the cone questions was it 30.6N?

Reply 33

Gabzinc

Original post by DragonsOfAsshai

I got 24N from 32/2 * 1.5

Ok good this is what I got

Reply 34

psu

Does anyone have the answer for the 11 marker?

Reply 35

DragonsOfAsshai

Original post by psu

Does anyone have the answer for the 11 marker?

Idk if i'm right but I got

\frac{r}{8}(3\sqrt{3}+\sqrt{11})

Reply 36

psu

I definitely had r/8 but had an integer and a root 33 in the brackets I think. So not the same answer :-/

Original post by DragonsOfAsshai

Idk if i'm right but I got

\frac{r}{8}(3\sqrt{3}+\sqrt{11})

Reply 37

DragonsOfAsshai

Original post by psu

I definitely had r/8 but had an integer and a root 33 in the brackets I think. So not the same answer :-/

Any chance you multiplied root 3 and root 11 instead of adding or something?

Reply 38

lzyby23

same. I know a lot of people got this as well.

Original post by DragonsOfAsshai

Idk if i'm right but I got

\frac{r}{8}(3\sqrt{3}+\sqrt{11})

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[OCR A] A-Level Further Mathematics: Mechanics 18th June 2019

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