AQA MM1B - Mechanics 1 -Tuesday 21st June 2016

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Reply 40

PiTheta97

Original post by koolgurl14

did anyone get 80.6 for the ten marker?

Well I got 80.5 which is probably a rounding error on my part but yeah I did

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Reply 41

Dukey98

What times did you get when the velocitys were parrallel? I got t=5 and t=25 which I then used in the position vector equation to get 309m between them?

Reply 42

Chickenslayer69

I got 80.5 for the last question. Projectile question was awful, and that 4 mark question on the ramp one asking for the angle I didn't understand. What did people get for that? Got 5 degrees or something but it's probably wrong.

Reply 43

Hep123

Original post by Dukey98

What times did you get when the velocitys were parrallel? I got t=5 and t=25 which I then used in the position vector equation to get 309m between them?

I got 12s sorry Im stressing now haha because vectors will be parallel when vector a is a multiple of vector b

(edited 7 years ago)

Reply 44

1TrueMeaning

Original post by RUNSran

You got t= 5 and t= 25 right? if you sub either of both value to the equation of Va =Vb you wont get the same i or j components

Oooo. I got to that stage but didnt know how to proceed. hopefully get some marks.

Reply 45

RUNSran

Original post by smartsy

I got around 13

yeah same

Reply 46

MLW12345

Original post by Examguy123

For the plane wind question you do 240/20 to get 12 ms for the speed of the wind then from there u can work out the resultant velocity

Magic that's what I got ended up using that data for the next questions though, probably got bearing wrong around 007deg

Reply 47

Hep123

Original post by Hep123

I got 12s sorry Im stressing now haha because vectors will be parallel when vector a is a multiple of vector b

the multiple will be the time

Reply 48

RealistZ

I got 13.2 on the 7 mark proj ans 97.6 on last 10 mark one

Reply 49

fizach

Original post by Chickenslayer69

yeah got 4. something when rounded its 5

Reply 50

Hep123

Original post by RealistZ

I got 13.2 on the 7 mark proj ans 97.6 on last 10 mark one

I got the same for the 7 mark but not the 10 mark

Reply 51

gardenGnostic

This paper's got me feeling like

Reply 52

fizach

any idea about the grade boundaries folks ?

Reply 53

Conte'sBlueArmy

How did you do the finding the angle of the ramp question? I did some weird thing where I cancelled mass, (f=ma), probably didn't work.

Reply 54

RUNSran

Original post by Dukey98

What times did you get when the velocitys were parrallel? I got t=5 and t=25 which I then used in the position vector equation to get 309m between them?

I got same but I didnt know which to use and both values didnt satisfy the equation Va=Vb. i was so confuse

Reply 55

1TrueMeaning

Original post by Hep123

I got the same for the 7 mark but not the 10 mark

Did you have to subtract the two different values for t?

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Reply 56

1TrueMeaning

Original post by Hep123

I got the same for the 7 mark but not the 10 mark

What did you get for t in the first question.

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Reply 57

liemluji

I got 14.6 m/s for the 7 marker.

I did Vcos50 × t = previous horizontal length (13. sth + 3) .

it took 1.7 sth seconds to hit the top of the box so I subbed the same time into the equation above to get 14. 6

Reply 58

Hep123

did people get 8 for the bearing?

Reply 59

Applicant75235

Original post by RUNSran

You got t= 5 and t= 25 right? if you sub either of both value to the equation of Va =Vb you wont get the same i or j components. I was really confuse on where to go from there

well i used t=5 because only the i component of the velocity is the same therefore i subbed 5 into the r=ut+1/2at^2 of the A and the r=ut+1/2at^2 + r original of the B then i subtracted the two r from each other to get the distance then i added the square of the i component and the square of the j component and square rooted the answer. Its really hard to explain it without paper and pen I'm not even sure of my answer lol