Thedelldays Posted 5 September, 2012 Share Posted 5 September, 2012 (edited) to get the brain going.. The speed of light is 3x108 meters per second jupiter is 778 million km from the sun calculate the number of minutes it takes for sunlight to reach jupiter Edited 5 September, 2012 by Thedelldays Link to comment Share on other sites More sharing options...
ALWAYS_SFC Posted 5 September, 2012 Share Posted 5 September, 2012 to get the brain going.. The speed of light is 3x108 meters per second jupiter is 778 million km from the sun calculate the number of minutes it takes for sunlight to reach jupiter (answer is standard form of course) Very quickly... Link to comment Share on other sites More sharing options...
Hatch Posted 5 September, 2012 Share Posted 5 September, 2012 is it 2m and 36 seconds by any chance Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 is it 2m and 36 seconds by any chance how did you come to this? Link to comment Share on other sites More sharing options...
Hatch Posted 5 September, 2012 Share Posted 5 September, 2012 with a calculator Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 with a calculator what did you do..? Link to comment Share on other sites More sharing options...
Hatch Posted 5 September, 2012 Share Posted 5 September, 2012 may be wrong, probably is, I failed A level maths I reckon 10 to the power of 8 is 100,000,000 x 3 = 300,000,000 778 / 300 is 2.6 so 2mins 36 secs Link to comment Share on other sites More sharing options...
andysstuff Posted 5 September, 2012 Share Posted 5 September, 2012 is it 2m and 36 seconds by any chance No, it's 8 minutes to the earth 40 minutes or thereabouts Link to comment Share on other sites More sharing options...
Hatch Posted 5 September, 2012 Share Posted 5 September, 2012 may be wrong, probably is, I failed A level maths I reckon 10 to the power of 8 is 100,000,000 x 3 = 300,000,000 778 / 300 is 2.6 so 2mins 36 secs hang on , i got my kms and m mixed up Link to comment Share on other sites More sharing options...
Hatch Posted 5 September, 2012 Share Posted 5 September, 2012 new guess. 43 mins and 12 secs Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 may be wrong, probably is, I failed A level maths I reckon 10 to the power of 8 is 100,000,000 x 3 = 300,000,000 778 / 300 is 2.6 so 2mins 36 secs you have got....300m meters per second... 778m KM.....dividing distance by speed on this one is a bit off and they are not at the same level if you get me..? Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 new guess. 43 mins and 12 secs correct Link to comment Share on other sites More sharing options...
andysstuff Posted 5 September, 2012 Share Posted 5 September, 2012 778,000,000 KM = 778,000,000,000 meters distance 300,000,000 = speed of light. Cross off the 0's = 7780/3 seconds = 2593 seconds = 43 minutes 18 seconds Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 (edited) we were doing this at work to pass some time lol... this one stumped me as I cocked up and got the term "light year" wrong... A star is 500 light years away from earth of the speed of light is 3x105 km/s. what is the distance from the star to Earth answer to be given in KM and in standard form Edited 5 September, 2012 by Thedelldays Link to comment Share on other sites More sharing options...
Smirking_Saint Posted 5 September, 2012 Share Posted 5 September, 2012 Why are you doing maths ? Badly ? Link to comment Share on other sites More sharing options...
Deano6 Posted 5 September, 2012 Share Posted 5 September, 2012 Just did it on some paper (no calculator) scraping what I remembered of long division from primary school and making a few close simplifications and got 42 1/3 mins. I do have a maths degree tho for full disclosure. Link to comment Share on other sites More sharing options...
gaz Posted 5 September, 2012 Share Posted 5 September, 2012 Why are you doing maths ? Badly ? Backyard astrophysics project to land on the sun? Link to comment Share on other sites More sharing options...
St Chalet Posted 5 September, 2012 Share Posted 5 September, 2012 Why are you doing maths ? Badly ? Please tell me your Sub isn't a nuclear one? Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 Please tell me your Sub isn't a nuclear one? what? Link to comment Share on other sites More sharing options...
Smirking_Saint Posted 5 September, 2012 Share Posted 5 September, 2012 what? I fear this is going to be a spelling and or grammar moment. All I can say is have you ever tried writing anything of length on an Iphone Link to comment Share on other sites More sharing options...
Thedelldays Posted 5 September, 2012 Author Share Posted 5 September, 2012 I fear this is going to be a spelling and or grammar moment. All I can say is have you ever tried writing anything of length on an Iphone righty ho Link to comment Share on other sites More sharing options...
Ken Tone Posted 6 September, 2012 Share Posted 6 September, 2012 we were doing this at work to pass some time lol... this one stumped me as I cocked up and got the term "light year" wrong... A star is 500 light years away from earth of the speed of light is 3x105 km/s. what is the distance from the star to Earth answer to be given in KM and in standard form I reckon 4.73 x 10 ^15 km to 3 sig figs. I took a year as 365 1/4 days which is not dead accurate but I think close enough for the sig figs in answer. May have to pace it out to be sure though! Link to comment Share on other sites More sharing options...
View From The Top Posted 6 September, 2012 Share Posted 6 September, 2012 About 4730trillion km which my clever colleague assures me is 153.3 parsecs. Link to comment Share on other sites More sharing options...
Dimond Geezer Posted 6 September, 2012 Share Posted 6 September, 2012 I reckon 4.73 x 10 ^15 km to 3 sig figs. I took a year as 365 1/4 days which is not dead accurate but I think close enough for the sig figs in answer. May have to pace it out to be sure though! That's what I've got (4.73364x10^15 actually). If you take the tape, I'll hold this end here. Link to comment Share on other sites More sharing options...
JPTCount Posted 6 September, 2012 Share Posted 6 September, 2012 wot happens if ur travelling at the speed of light and u turn ur headlights on...? Link to comment Share on other sites More sharing options...
Thedelldays Posted 6 September, 2012 Author Share Posted 6 September, 2012 wot happens if ur travelling at the speed of light and u turn ur headlights on...? your face caves in....apparently. corrent diamond geezer....well, the answer I got was saying a year is 365 days and missed out the 1/4 Link to comment Share on other sites More sharing options...
Ken Tone Posted 6 September, 2012 Share Posted 6 September, 2012 wot happens if ur travelling at the speed of light and u turn ur headlights on...? You see Schrodinger's cat right in front of you. Though to be fair, Heisenberg is a bit dubious about that. Oh, the old tacky-ones are the best! Link to comment Share on other sites More sharing options...
Ken Tone Posted 6 September, 2012 Share Posted 6 September, 2012 That's what I've got (4.73364x10^15 actually). If you take the tape, I'll hold this end here. Ah, but would it be a tape, or would you use a rule? Might get a bit of a catenary bend there with a flexible tape, even with near-zero gravity. Link to comment Share on other sites More sharing options...
Dimond Geezer Posted 6 September, 2012 Share Posted 6 September, 2012 Ah, but would it be a tape, or would you use a rule? Might get a bit of a catenary bend there with a flexible tape, even with near-zero gravity. At that distance there may be a hint of catenary in a rule. Definitely let the junior do the travelling, although at 45p per mile, the expenses might kill the job, I think I'll let someone else work out the logistics. Link to comment Share on other sites More sharing options...
Durleyfos Posted 6 September, 2012 Share Posted 6 September, 2012 Ah, but would it be a tape, or would you use a rule? Might get a bit of a catenary bend there with a flexible tape, even with near-zero gravity. Use a laser measure. Link to comment Share on other sites More sharing options...
Big Bad Bob Posted 6 September, 2012 Share Posted 6 September, 2012 wot happens if ur travelling at the speed of light and u turn ur headlights on...? Well, as the emitter is travelling at the speed of light, initially, the light particles will travel at 2x the speed of light, which is impossible...... Link to comment Share on other sites More sharing options...
ecuk268 Posted 6 September, 2012 Share Posted 6 September, 2012 The speed of light is relative to the emitter. Otherwise, if you run forward holding a torch, the light from the torch would exceed the speed of light. Link to comment Share on other sites More sharing options...
Thedelldays Posted 6 September, 2012 Author Share Posted 6 September, 2012 as someone asked...reason why we were doing maths at work is one of the lads is about to go on an Engineering degree type course (3 years between HMS Collingwood and Soton Uni) and he was doing some maths revision/brush up and it got the old mind going.... Link to comment Share on other sites More sharing options...
Ken Tone Posted 6 September, 2012 Share Posted 6 September, 2012 as someone asked...reason why we were doing maths at work is one of the lads is about to go on an Engineering degree type course (3 years between HMS Collingwood and Soton Uni) and he was doing some maths revision/brush up and it got the old mind going.... It may reassure him to hear the old saying. ...... There are 3 kinds of people in this world - those who can count and those who can't. Link to comment Share on other sites More sharing options...
Smirking_Saint Posted 6 September, 2012 Share Posted 6 September, 2012 If he is doing an engineering degree he will need to brush up a bit better than this. What course is he doing ? And has he ever heard of complex numbers and some ***t called Laplace ? Link to comment Share on other sites More sharing options...
Ken Tone Posted 7 September, 2012 Share Posted 7 September, 2012 He only said engineering. It's not as if it's proper Maths Link to comment Share on other sites More sharing options...
Whitey Grandad Posted 7 September, 2012 Share Posted 7 September, 2012 He only said engineering. It's not as if it's proper Maths Oi! Watch it. Link to comment Share on other sites More sharing options...
dellboypete Posted 7 September, 2012 Share Posted 7 September, 2012 Funny how coincidences happen - talking about the speed of light and stuff (coincidentally ) I was on a train coming out of waterloo last night and another train left at exactly the same time (that's a coincidence in itself on SWT). We traveled at exactly the same speed (slow - not the speed of light!!) as far as Vauxall. During that time you had the uncanny feeling that you weren't actually moving. having done physics at university many eons ago I immediately started thinking in terms of frames of reference (as you do) and the special theory of relativity which was developed by Einstein (probably on a train coming out of waterloo that left at exactly the same time as another train!) in which one of his postulates was the constant speed of light. So when I got in the office this morning I spent sometime refreshing the grey matter on these important and fundamental concepts to mankind Then I log into saintsweb and I find the rest of the known universe discussing the speed of light - weird or what Link to comment Share on other sites More sharing options...
Viking Warrior Posted 7 September, 2012 Share Posted 7 September, 2012 infinity and beyond besides there is no bus between jupitar and the sun Link to comment Share on other sites More sharing options...
PhilippineSaint Posted 7 September, 2012 Share Posted 7 September, 2012 infinity and beyond besides there is no bus between jupitar and the sun Thats why he was on the train Link to comment Share on other sites More sharing options...
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