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# centre of mass watch

1. Q3 - The answer in the book is 8.31cm?
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2. (Original post by pippabethan)
Q3 - The answer in the book is 8.31cm?
May be a little rusty, but I agree with your value, provided the densities of the two shapes are the same.
3. I worked through your working and got the same.
4. (Original post by joostan)
May be a little rusty, but I agree with your value, provided the densities of the two shapes are the same.
(Original post by nerak99)
I worked through your working and got the same.
Thank you both I'll change the answer in the book
5. Please could you help with this one too (part b)? I got a different answer to the book again :/
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6. (Original post by pippabethan)
Please could you help with this one too (part b)? I got a different answer to the book again :/
What was the answer the book gave?
7. (Original post by joostan)
What was the answer the book gave?
19.7*
8. I get 20.85 from
9. (Original post by pippabethan)
19.7*
Hmm, I wondered if the two answers were somehow equivalent or they were using CD as the vertical for some reason - it would seem not.
Again I agree with you.
10. (Original post by joostan)
Hmm, I wondered if the two answers were somehow equivalent or they were using CD as the vertical for some reason - it would seem not.
Again I agree with you.
Thank you! I'm getting different answers on quite a few of these, so I'm really grateful for your help!!
11. (Original post by nerak99)
I get 20.85 from

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