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# ENGAA watch

Hi, im struggling to do question 51- I have tried drawing it (have a horizontal parabola) and a straight line but where do i go from there?
2. (Original post by bruh2132)

Hi, im struggling to do question 51- I have tried drawing it (have a horizontal parabola) and a straight line but where do i go from there?
I also dont know how to do question 53 if anyone can help
3. For 53. Search for Descartes rule of signs
4. (Original post by yukeming)
For 53. Search for Descartes rule of signs
just looked it up but I only see two change of signs in the polynomial? maybe I dont get it

bump
5. Bro question 51 or 53 the area under graph is ****ed up. U equate both function to find out the intersection is at y equal 0 and 2. Then u realize the x equals 7 is always bigger than the other function . So integrate 7 minus the other function from y equals 2 to y equals 0. That question cannot be done in 90 seconds . Don't bother
6. (Original post by yukeming)
Bro question 51 or 53 the area under graph is ****ed up. U equate both function to find out the intersection is at y equal 0 and 2. Then u realize the x equals 7 is always bigger than the other function . So integrate 7 minus the other function from y equals 2 to y equals 0. That question cannot be done in 90 seconds . Don't bother
yup I hardly get it and tbh yh timing is so messed up I don't get how anyone could finish the test, Im just aiming for 50% now if im lucky
7. (Original post by bruh2132)
yup I hardly get it and tbh yh timing is so messed up I don't get how anyone could finish the test, Im just aiming for 50% now if im lucky
Bruh can u tell me why spring 3 is the answer to "
which sample does not obey hooke's law up to 2 percent strain"
8. (Original post by yukeming)
Bruh can u tell me why spring 3 is the answer to "
which sample does not obey hooke's law up to 2 percent strain"
what question?
9. (Original post by bruh2132)
what question?
2016 section 2 question 1
10. (Original post by yukeming)
2016 section 2 question 1
well basically I did x/(delta)x= 2% = 0.02
since x= 100mm you can work out (delta) x and from there you can look at the graph at that extension and see which isn't a straight line
11. (Original post by bruh2132)
well basically I did x/(delta)x= 2% = 0.02
since x= 100mm you can work out (delta) x and from there you can look at the graph at that extension and see which isn't a straight line
I thought strain is equals to Delta x/ x?
12. (Original post by yukeming)
I thought strain is equals to Delta x/ x?
yh sorry my mistake, it is deltax/ x and if you do it you actually get an extension of 2mm and if you look on the graph S2 is curved there

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