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Consider a small bob hanging freely to a string whose free end is attached to a fixed-support. If the bob is set into periodic oscillation, use dimensional analysis to derive the formula for the period of oscillation of the system.
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6 stepsTutatumia uchambuzi wa vipimo kutoa fomula ya kipindi cha mzunguko () wa pendulum rahisi.
Tambua vigezo vinavyoathiri kipindi cha mzunguko.
Kipindi cha mzunguko () kinaweza kutegemea:
- Masi ya bob ()
- Urefu wa kamba ()
- Mchapuko wa mvutano ()
Andika vipimo vya kila kigezo.
- Kipindi ():
- Masi ():
- Urefu ():
- Mchapuko wa mvutano ():
Weka uhusiano wa jumla kati ya na vigezo vingine.
Tuchukulie kuwa inategemea , , na kwa namna ifuatayo:
ambapo ni kigezo kisicho na vipimo, na ni vizidisho tunavyotaka kupata.
Linganisha vipimo vya pande zote mbili za mlinganyo.
Upande wa kushoto:
Upande wa kulia:Kwa kulinganisha vipimo vya pande zote mbili, tunapata:
Unda na suluhisha milinganyo ya vizidisho.
Kulinganisha vizidisho vya vipimo vya msingi ():
Kwa :
Kwa :
Kwa :Sasa, badilisha thamani ya kwenye mlinganyo wa :
Badilisha vizidisho kwenye fomula ya jumla.
Tukiweka , , na kwenye fomula ya jumla:
Kutoka kwa uchambuzi wa vipimo, hatuwezi kupata thamani ya kigezo kisicho na vipimo . Hata hivyo, tunajua kutokana na nadharia ya pendulum rahisi kwamba .
Hivyo, fomula kamili ni:
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