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Mechanics - Vectors



Any hints on how to do this question?
(edited 9 years ago)
Original post by khanpatel321


Any hints on how to do this question?


Think of the information you're given in the question and which equation from a set you know that you want to use.

Then think about what you've just calculated and the angle they've given.

As with a lot of Mechanics it may help to draw a diagram.
Original post by SeanFM
Think of the information you're given in the question and which equation from a set you know that you want to use.

Then think about what you've just calculated and the angle they've given.

As with a lot of Mechanics it may help to draw a diagram.




s = 0*3 + 0.5 * 2^2 * 3^2 = 9

s = 9 meters so r = 9 meters

r = 4.5i + 7.794j

The magnitude or r = sqrt(4.5^2 + 7.794^2 ) = 8.99980.. = 9

Is this correct?
Original post by khanpatel321
s = 0*3 + 0.5 * 2^2 * 3^2 = 9

s = 9 meters so r = 9 meters

r = 4.5i + 7.794j

The magnitude or r = sqrt(4.5^2 + 7.794^2 ) = 8.99980.. = 9

Is this correct?


Well done :smile: It may help to show how you got from r to its components, and you've already found the length and split it up into its components, but I suppose putting the components back together using Pythagoras as you've done is a good way to double check the answer.
Original post by SeanFM
Well done :smile: It may help to show how you got from r to its components, and you've already found the length and split it up into its components, but I suppose putting the components back together using Pythagoras as you've done is a good way to double check the answer.


Thank you

Please can you help me with the second part
It looks like someone is helping you here. :smile:

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