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September 22, 2019, 01:49:59 am

### AuthorTopic: Maths help  (Read 181 times) Tweet Share

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#### TyranT

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##### Maths help
« on: August 23, 2019, 04:16:01 am »
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I am confused on 18b). I think u have to work out 18a) and i got 115 degrees True North. 18b im not sure what to do the answers say 3.32 km and i am getting 3.2. Any help will be appreciated

#### SmellsLikeTeenSpirit

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##### Re: Maths help
« Reply #1 on: August 23, 2019, 11:37:07 am »
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Hi Tyrant,
1) After moving 2.7 km NE, the coordinates in x-y terms are (1.91, 1.91), i.e. 2.7 divided by the square root of 2. The person moved 1.91 km northwards and the same distance eastwards.
2) By moving then 7.4 km SE, the person moved 5.23 km southwards and 5.23 km eastwards (7.4 km divided by the square root of 2).
3) In the first run, the person moved 1.91 km northwards, in the second run it moved 5.23 km southwards, i.e. in the opposite direction.
4) Hence, the person's total shift southwards is 5.23 - 1.91 = 3.32 km. The shift in part (b) does not affect the southern position, taking place only in the east-west direction.

Cheers

#### TyranT

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##### Re: Maths help
« Reply #2 on: August 27, 2019, 07:49:36 am »
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