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# C4 help edexcel watch

1. will post in a min

2. part b
3. I assume you've done part (a)?
If so, you should be able to relate (b) to (a) - if not, reread the question, and think about the similarities and differences between the candle and the solid generated in part (a). You should see a relationship between the 2 solids
4. (Original post by JSG29)
I assume you've done part (a)?
If so, you should be able to relate (b) to (a) - if not, reread the question, and think about the similarities and differences between the candle and the solid generated in part (a). You should see a relationship between the 2 solids
yeah I have done A
5. (Original post by Qer)
yeah I have done A
Can you see the relationship I mentioned?
6. (Original post by JSG29)
I assume you've done part (a)?
If so, you should be able to relate (b) to (a) - if not, reread the question, and think about the similarities and differences between the candle and the solid generated in part (a). You should see a relationship between the 2 solids
I think part a and b is exactly the same thing except they gave AB =15 and in part A they gave -1 and 2/3
so what i have done so far is that i used the expression that I got in part a but replace it limits with 0 and 15 but I get the wrong answer
7. I'm thinking volume scale factor = linear scale factor cubed.
8. The original length would be 1+2/3 = 5/3. The new is 15. The linear scale factor = 9 so the volume will be 729x bigger.
9. (Original post by Qer)
I think part a and b is exactly the same thing except they gave AB =15 and in part A they gave -1 and 2/3
so what i have done so far is that i used the expression that I got in part a but replace it limits with 0 and 15 but I get the wrong answer
Changing the limits will give you a different shape. You have the right idea in terms of the relationship between the 2 shapes, but you need to use a scale factor instead of changing the limits (remember volume scale factor != linear scale factor)
10. (Original post by Qer)
I think part a and b is exactly the same thing except they gave AB =15 and in part A they gave -1 and 2/3
so what i have done so far is that i used the expression that I got in part a but replace it limits with 0 and 15 but I get the wrong answer
The height of the generator solid is units, let's say these units are cm, then to go from this height to 15cm you need to multiply by 9. Hence 9 is your linear scale factor, use it for the candle volume.
11. What paper is this?
12. (Original post by Titanium_Man)
What paper is this?
jan2016 ial
13. Thanks for everyone:h

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