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Higher Physics homework help

MoffatRFC

Posted 31 August 2009 - 05:36 PM

i have been on holiday and am confused on where to start and this is due tommorrow

1) if a gale is blowing 30ms-1 from the west, what is its component in a northerly direction ?

2) if a tide flows north eastwards at 5 ms-1, how quickly is a floating log carried
i) to the north ii) to the east


any help much appreciated

x-amz-x

Posted 31 August 2009 - 06:02 PM

hey smile.gif

if a gale is blowing from west to east, there is no northerly direction
therefore the component is 0ms-1 smile.gif

the tide is flowing at 45 degrees to both directions respectably
to work out the north, it is 5sin(45) from your basic knowledge of trig
hence the east direction can be figured from 5cos(45)

you should get
i) 3.54 ii) 3.54

btw, it is going north east so both components will be the same

hope this helps, just finished doing it myself biggrin.gif

amz x

MoffatRFC

Posted 31 August 2009 - 06:48 PM

thanks verymuch for your reply i understand what you mean but im still a bit unsure on how to lay it out do i not need to draw any diagrams or anything ?

also is question one the same concept ? or something differnet i cant copy question one cause its diagrams sorry for wasting your time tongue.gif

x-amz-x

Posted 31 August 2009 - 08:42 PM

you could do a diagram for question 2, something, like a North, East, West, South, (the crossing straight lines, with each point labelled) with a line going off to the north-east, then label the 45 deg angles, you should be able to see the triangles for the trig.

and question 1 would be similar sort of question

hope this answers some of your questions biggrin.gif

amz x

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