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Is 100kg of stones heavier than 100kg of cotton? Why? How?

Discussion in 'Jukwaa la Elimu (Education Forum)' started by Pape, Sep 14, 2010.

  1. Pape

    Pape JF-Expert Member

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    ...
     
  2. Nyani Ngabu

    Nyani Ngabu Platinum Member

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    I think it may have to do with density and stuff...
     
  3. Steve Dii

    Steve Dii JF-Expert Member

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    From little I can remember about physics, I would say, 100kg of stones is equal to 100kg of cotton as far as the weight is concerned.

    However, the measurement in mass of the two objects would not be equal, so is their densities and volumes.
     
  4. Kiranga

    Kiranga JF-Expert Member

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    A kilogram is a kilogram, and it doesn't matter whether you are talking about a kilogram of stones or cotton.

    On the other hand, a pound of gold is not the same as a pound of feathers. A pound of feathers is heavier than a pound of gold.
     
  5. Steve Dii

    Steve Dii JF-Expert Member

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    Kiranga, the pound you're talking about is it the imperial unit of weight?! If so, why should the two have different weights?!
     
  6. Mtazamaji

    Mtazamaji JF-Expert Member

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    Explanation kwa kumbukumbu za physics ya form1 1 ni kuwa Density= Mass/Volume

    Volume nadhani kwa kiswahili ni ujazo. Kwa mfano rahisi ni kuwa

    utahitaji ujazo mkubwa zaidi kuweka pamba ya KG 100 kuliko ujazo utakaohitajika kuweka maweya kg 100. Ndo kusema Uzito( Mass) ni sawa lakini kinachofautisha ni ujazo.

    kwa fomula hiyo realistic assumption itakuwa hivi
    Kg 100 za mawe be zita occupy ujuzo wa cubic centimer 5. Kwa hiyo density yake= 20Kg/cubic
    Pia kg 100 za pamba may be zita occupy ujaz wa cubic centimer 20 . Kwa hiyo density ya pamba itakuwa 5kg/cubic centimeter

    Kwa hiyo Mawe ni denser than Pamba but not heavier.

    Sijui kama niko sawa.
     
  7. Pape

    Pape JF-Expert Member

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    hapo kwenye red bado sijakusoma. Roughly, 0.5 Kg = 1 lb (pound), kama hivyo ndiyo.....inakuwaje 200 lb ya mawe isiwe sawa na 200 lb ya pamba wakati kg na lb ni vipimo vya uzito?
     
  8. Njaa

    Njaa JF-Expert Member

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    yes there is little different between mass and weight, weight determined by gravitational pull (weight = mass x gravity force(g)), but (mass = density/volume). According to the formula of weight, then 100kg of stone and 100kg of cotton they should have the same weight provided that the measurement is taken at the same place. The value of gravity force decreases as you away from the Earth surface, Hence if the measurement is taken on the moon surface then both will have the same weight because g is the same.

    My conclusion is, 100kg of stone and 100 kg of cotton they have the same mass every where, and they have the same weight in the same altitude.
     
  9. E=mcsquared

    E=mcsquared JF-Expert Member

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    The 2 parcels have essentially the same weight, unless are in different positions of the earth's surface where gravitation due to acceleration differs significantly, short of which some recent recent experimental evidence showing otherwise should be given, and possibly backed up by a Nobel Prize award in Physics.

    However, if only their masses are observed using a naked eye, one may apparently conclude the opposite of the blinded assertion as presented here.
     
  10. Kiranga

    Kiranga JF-Expert Member

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    A pound of feathers is heavier than a pound of gold because gold is measured in troy pounds, while feathers are measured in avoirdupois pounds.

    Troy pounds have 12 ounces; avoirdupois pounds have 16 ounces. A Troy pound contains 372 grams in the metric system; an avoirdupois pound contains 454 grams in the metric system, therefore each troy ounce is heavier than an avoirdupois ounce, making a pound of feathers heavier than a pound of gold.

    Don't blame me, blame the English.
     
  11. Butola

    Butola JF-Expert Member

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    Usahihisho kidogo; Mass = Density x Volume;
    Weight= Mass x Acceleration due to Gravity;
     
  12. Mtazamaji

    Mtazamaji JF-Expert Member

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    Tumia SI unit zinazoeleweka kwa wengi. Au mwenzetu toka O Level ulikuwa ushaenda kwa malkia.
     
  13. Kiranga

    Kiranga JF-Expert Member

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    "SI unit zinazoeleweka " ndiyo kitu gani ? Unaniambia nitumie standards wakati wewe mwenyewe hujui kufuatisha standards?

    Halafu kwa nini unalazimisha nitumie standard fulani ? Who died and made you chief in here ?

    Unaweza kufuatilia mada? Mbona nilishajibu kwali katika SI units hapo juu?

    Au unataka kupamia tu ?
     
  14. Ng'wanangwa

    Ng'wanangwa JF-Expert Member

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    In terms of weight, both are equal (because weight is determined by g = 9.81kgF. And this is applicable for both stones and cotton, but in terms of mass there must be a difference because by definition mass of an object is the quantity of matter it contains.

    A stone has its particles more compacted than that of cotton. Consequently, 100kg of stone will occupy little space than that of cotton.

    Little space means lower volume occupied and therefore high density for 100kg of stone than 100kg of cotton.
     
  15. Kiranga

    Kiranga JF-Expert Member

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    How do you measure mass ? What SI Units do you use to measure mass ?

    The question is "which is heavier", and we are already given the respective kgs, so density and volume do not figure prominently as you suggested.It is not like we have to use density and volume to find the kgs, we have the respective kgs already.

    The question is essentially, which is heavier 100 kg or 100 kg ?

    The "cotton" and "stones" aspect of the question is introduced to give a psychological illusion, because people would associate stones with heavy and cotton with light, but as long as they are both 100kg, there is no difference in heavyness.

    Now had the question been one metre cube of stone vs one metre cube of cotton, with the known average densities of cotton and stones, the higher density of stones (presuming we are talking of average stones with a higher density than that of cotton) would figure and the illusion will become a reality, and one metre cube of stone would be heavier than one metre cube of cotton.
     
  16. Mtazamaji

    Mtazamaji JF-Expert Member

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    Usiwe na jazba Kiranga
    SI unit ni Standard Measuremnt Unit.
    hayo mambo ya troy pounds na avoirdupois pounds unayoyasema unaweza kuyafafanua kimahesabu? unaweza kufanya conversion zake. Umewai kufanya calcculation ya physics kwenye uzito wa punds?

    Ndio maana kukawepo kuna kitu kinaitwa SI unit inayokubalika kimataifa. Ukisema umbali wa kutoka eneo A to B ni yards 600 hiyo siyo SI unit inayokubalika labda kwa hao waingereza

    So tell us when u critically challenge others people's ideas, comments and views who died and made u chef?

    Hata uki google kitu usichukue kizima kizima kama kilivyo.
     
  17. CalvinPower

    CalvinPower JF-Expert Member

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    lakini jamaa kaandika 100gk na sio 100kg cheki mwanzo wa thread. g before k means what? hii units siijui may be ya mars
     
  18. Kiranga

    Kiranga JF-Expert Member

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    As long as tunaongelea standards, let's keep them.

    Hakuna kitu kama "SI Unit zinazoeleweka" either unaongelea "SI Unit inayoeleweka" au "SI Units zinazoeleweka"

    Nini SI Units, watu tushaona mpaka galactic units, Kilingon units, negative energy, imaginary time, anti-matter, multiverses, action-at-a-distance spookyness na singularity yenyewe measurements zote zinapovunjika.

    Unaniuliza nifafanue na kufanya conversion wakati conversion nishakupa hapo juu? Unajua kusoma wewe?

    Unajua hata tofauti kati ya "Chief" na "chef"?

    Inaonekana hujui.
     
  19. Steve Dii

    Steve Dii JF-Expert Member

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    Duuuh.....!!! umeona yote hayo???! wee mtu unatisha kwelikweli!!!! :))
    NN sijui yuko wapi hapa.... can't wait for a skit to this on-stage battle lol
     
  20. Kiranga

    Kiranga JF-Expert Member

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    Wewe kwa kushabikia tu, ushaona saa inayokwenda anti-clockwise lakini haipotezi uwezo wa kuonyesha majira sawa ?

    Watu tushaona mpaka antigravity katika Kaluza-Klein spacetime, na flatworlds zenye multiple time dimensions huyu anatusimangia "SI Unit zinazoeleweka" ?
     
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