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Idle Banter For non SV and non bike related chat (and the odd bit of humour - but if any post isn't suitable it'll get deleted real quick). There's also a "U" rating so please respect this. Newbies can also say "hello" here too. |
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03-07-08, 04:23 PM
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#1 |
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Trinity
Mega Poster
Join Date: Jun 2006
Location: Guildford
Posts: 8,027
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Time to redeem yourselves (maffs)
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03-07-08, 04:41 PM
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#2 |
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Guest
Posts: n/a
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Re: Time to redeem yourselves (maffs)
20/20
I iz good maffs to 
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03-07-08, 05:02 PM
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#3 |
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Member
Mega Poster
Join Date: Sep 2005
Location: Ex motorcyclist
Posts: 1,961
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Re: Time to redeem yourselves (maffs)
19/20, didn;t get the last no. squared -1.
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https://www.facebook.com/pete.philli...04?ref=tn_tnmn |
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03-07-08, 05:03 PM
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#4 |
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Guest
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Re: Time to redeem yourselves (maffs)
no comment i was totally rubbish
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03-07-08, 05:07 PM
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#5 | |
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Captain Awesome
Mega Poster
Join Date: Jan 2007
Location: Hamble
Posts: 4,266
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Re: Time to redeem yourselves (maffs)
Quote:
if it's rolled with twice the force it will accelerate twice as fast (assuming it's not approaching the speed of light where relativistic equations should be used) as we dont know the speed at which it starts i will assume it is stationary... the tennis ball rolls 40m in 20 seconds, therefore it's rate of acceleration is calculated using the equation of motion: s = ut + 1/2 (at^2) 40 = 0*26 + 0.5 * (a * 26^2) therefore a = 80 / 676 = 0.1183m/s^2 the acceleration of the ball is proportional to the force applied, therefore if the ball is rolled with twice the force the rate of acceleration will be 0.2367m/s^2 put that back into the equation and you have: t = sqrt[2s/a] = sqrt[(2*80 / 0.2367)] = 26 seconds somehow i don;t think that's how they intended you to calculate it though, i think they meant "if the ball is rolled at twice the speed" 
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Official "Dumbass of the Year" 2011 (_) ( _)>⌐■-■ (⌐■_■) Deal with it... |
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03-07-08, 05:23 PM
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#6 |
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Guest
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Re: Time to redeem yourselves (maffs)
Argh, 18/20, I forgot to add "squared" after doing the maths of the rectangle one!
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03-07-08, 05:40 PM
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#7 | |
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Guest
Posts: n/a
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Re: Time to redeem yourselves (maffs)
Quote:
Bravo. |
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03-07-08, 05:49 PM
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#8 |
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Guest
Posts: n/a
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Re: Time to redeem yourselves (maffs)
20/20
 Number sequence took me a while though. |
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03-07-08, 06:29 PM
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#9 | ||
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Captain Awesome
Mega Poster
Join Date: Jan 2007
Location: Hamble
Posts: 4,266
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Re: Time to redeem yourselves (maffs)
Quote:
__________________
Official "Dumbass of the Year" 2011 (_) ( _)>⌐■-■ (⌐■_■) Deal with it... |
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03-07-08, 07:54 PM
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#10 |
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Guest
Posts: n/a
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Re: Time to redeem yourselves (maffs)
95% - messed up on the number sequence, so happy to have realised it was the square of the previous number that I forgot the -1 bit Dooh!
I missed the force/speed error and made the same mistake as they did. Good spot from lone wolf and a nice explanation as well! |
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