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# Question on gravity/mass watch

1. Well, question 3)c)ii) on this paper has got me stumped

http://web.aqa.org.uk/qual/gce/pdf/A...4-W-SQP-07.PDF

Despite using the exact same method shown in the mark scheme I have got a different answer and I cannot see how they have got the answer in the mark scheme! The answer I keep on getting is 5.53*10^12 kg but the mark scheme gives it as 2.4*10^24

Here's the mark scheme;
http://web.aqa.org.uk/qual/gce/pdf/A...4-W-SMS-07.PDF

2. (Original post by n_251)
Well, question 3)c)ii) on this paper has got me stumped

http://web.aqa.org.uk/qual/gce/pdf/A...4-W-SQP-07.PDF

Despite using the exact same method shown in the mark scheme I have got a different answer and I cannot see how they have got the answer in the mark scheme! The answer I keep on getting is 5.53*10^12 kg but the mark scheme gives it as 2.4*10^24

Here's the mark scheme;
http://web.aqa.org.uk/qual/gce/pdf/A...4-W-SMS-07.PDF

that was one tricky question..
you need to reslove all the forces..
Resolving Vertically

where
Resolving horizontally one would get;

The F is caused by the gravitational pull by the mountain

Solving this simultaneously would then give your mass of the earth..

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