+RonC Posted November 25, 2013 Share Posted November 25, 2013 BLIMEY!! I must be on the wrong forum!! Link to comment Share on other sites More sharing options...
Sheila Posted November 25, 2013 Share Posted November 25, 2013 Step 1 - Multiply both sides by r squared Step 2 - Multiple both sides by D cubed Step 3 - Divide both sides by G Step 4 - Divide both sides by m Step 5 - Cube root both sides Step 6 - r cubed cancels with the cube root to take r outside the brackets I think ... I've been coding 15 hours straight now ... oh dear what have i let myself in for Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 Step 1 - Multiply both sides by r squared Step 2 - Multiple both sides by D cubed Step 3 - Divide both sides by G Step 4 - Divide both sides by m Step 5 - Cube root both sides Step 6 - r cubed cancels with the cube root to take r outside the brackets I think ... I've been coding 15 hours straight now ... Yup - that's how I did it - simple stuff really - just loads of 0's making it look harder than it is. lol Link to comment Share on other sites More sharing options...
Cazz Posted November 25, 2013 Share Posted November 25, 2013 Step 1 - Multiply both sides by r squared Step 2 - Multiple both sides by D cubed Step 3 - Divide both sides by G Step 4 - Divide both sides by m Step 5 - Cube root both sides Step 6 - r cubed cancels with the cube root to take r outside the brackets I think ... I've been coding 15 hours straight now ... That's what I thought. I got my name right on the registration Link to comment Share on other sites More sharing options...
Daz Type-R Posted November 25, 2013 Share Posted November 25, 2013 So what's the numerical value for D? Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 25, 2013 Share Posted November 25, 2013 So what's the numerical value for D? It was hypothetical - the question says if you are given values for M, m and r can you work out what D is Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 Yup - it doesn't give the values - so I was left with an equation expressing D algebraically. If you can fill in the gaps I'll finish it off using windows calculator lol. Link to comment Share on other sites More sharing options...
Daz Type-R Posted November 25, 2013 Share Posted November 25, 2013 (edited) Nope, still don't get it, I'm obviously thick as horse muck. Think I will pass. Edited November 25, 2013 by Daz Type-R Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 25, 2013 Share Posted November 25, 2013 Nope, still don't get it, I'm obviously thick as horse muck. OK, if M is 5, m is 7 and r is -2, what is the value of D? Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 25, 2013 Share Posted November 25, 2013 Nope, still don't get it, I'm obviously thick as horse muck. Think I will pass. Bonus point question If the units of M are kg ^ 4 m are kg r are m What are the units of D? Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 D = 0.61555276858053820621694101900553 Link to comment Share on other sites More sharing options...
Sheila Posted November 25, 2013 Share Posted November 25, 2013 D = 0.61555276858053820621694101900553 SA Link to comment Share on other sites More sharing options...
Guest Kheldar Posted November 25, 2013 Share Posted November 25, 2013 D = 0.61555276858053820621694101900553 I think 2 s.f. would have sufficed Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 Well - I did say I would use Windows Calculator rofl (Too tempting to copy and paste) Link to comment Share on other sites More sharing options...
Daz Type-R Posted November 25, 2013 Share Posted November 25, 2013 As they said at school, show your workings out please. Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 As they said at school, show your workings out please. Errmmm the workings are already shown Daz - I just substituted the values given by Stephen to get the answer Link to comment Share on other sites More sharing options...
Daz Type-R Posted November 25, 2013 Share Posted November 25, 2013 (edited) Hmmm, that just confirms it, I'm thick (or just really don't get algebra), you lot have fun, I will stick to coding on a mainframe / Unix / Windows boxes. Edited November 25, 2013 by Daz Type-R Link to comment Share on other sites More sharing options...
Sheila Posted November 25, 2013 Share Posted November 25, 2013 Hmmm, that just confirms it, I'm thick (or just really done get algebra), you lot have fun, I will stick to coding on a mainframe / Unix / Windows boxes. i am confused by that too, but i dont let that bother me, just take it as a challenge.... even if i cant do it in the end i will give it my best shot. Maths was my weakest subject, we all have different skills, i loved Chemistry and found it easy, lots of others did not. We can each help the others. Thats why folks are great, we can all do different stuff. Just have to persevere longer on the stuff we find hard. Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 I was wrong anyway - just checked and I misread the equation - the real answer is : 2.2524957608872122339172013540225 You had a chance to trip me up and blew it lol Link to comment Share on other sites More sharing options...
Guest Eddy Posted November 25, 2013 Share Posted November 25, 2013 Blah, sod it, signed up, I'll try do it, I was in the high maths groups at GCSE but didn't do much at A level as I left for a job, so I'll see how it goes Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 i am confused by that too, but i dont let that bother me, just take it as a challenge.... even if i cant do it in the end i will give it my best shot. Maths was my weakest subject, we all have different skills, i loved Chemistry and found it easy, lots of others did not. We can each help the others. Thats why folks are great, we can all do different stuff. Just have to persevere longer on the stuff we find hard. Absolutely - I'm gonna need help with Chemistry - never did twig the way to work out swapping electrons and protons to turn base metals into pure gold lol Link to comment Share on other sites More sharing options...
Sheila Posted November 25, 2013 Share Posted November 25, 2013 Absolutely - I'm gonna need help with Chemistry - never did twig the way to work out swapping electrons and protons to turn base metals into pure gold lol pure alchemy Kim pure alchemy Link to comment Share on other sites More sharing options...
Daz Type-R Posted November 25, 2013 Share Posted November 25, 2013 i am confused by that too, but i dont let that bother me, just take it as a challenge.... even if i cant do it in the end i will give it my best shot.Maths was my weakest subject, we all have different skills, i loved Chemistry and found it easy, lots of others did not. We can each help the others. Thats why folks are great, we can all do different stuff. Just have to persevere longer on the stuff we find hard. I must admit it bothers me, I just can't get my head round it and winds me up. I understand you have to balance the equations, but I struggle to comprehend what I need to move where, under what circumstance a minus becomes a plus, a divide becomes a multiplication, the simple stuff in Stephens example was fine, I got that, but the example given on the web page....... Link to comment Share on other sites More sharing options...
Brantuk Posted November 25, 2013 Share Posted November 25, 2013 pure alchemy Kim pure alchemy Hahaha! - well we can trade maths equations for chemical equivalences till I can make enough gold to get a bigger Tak than yours rofl Link to comment Share on other sites More sharing options...
Sheila Posted November 25, 2013 Share Posted November 25, 2013 I must admit it bothers me, I just can't get my head round it and winds me up. I understand you have to balance the equations, but I struggle to comprehend what I need to move where, under what circumstance a minus becomes a plus, a divide becomes a multiplication, the simple stuff in Stephens example was fine, I got that, but the example given on the web page....... i also have the same problems as that Daz, but its about time i stopped avoiding it and have another crack at this sort of stuff.... old dog new tricks and all that... must prove that adage wrong at some point Link to comment Share on other sites More sharing options...
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