Qhov nruab nrab ntawm qhov ceev - teeb meem thiab kev daws teeb meem

Qhov nruab nrab ntawm qhov ceev - teeb meem thiab kev daws teeb meem

1. Muaj ib tug neeg tig ib lub duab plaub fab uas ntev li 400 m thiab dav li 100 m, 12 zaug hauv 1 teev. Qhov ceev nruab nrab thiab qhov ceev nruab nrab yog dab tsi?

Paub:

Qhov ntev ntawm lub duab plaub fab = 400 meters

Dav ntawm lub duab plaub fab = 100 meters

Lub voj voog ntawm lub duab plaub fab = (2 x 400 meters) + (2 x 100 meters) = 800 meters + 200 meters = 1000 meters

Qhov Nrug = 12 x 1000 meters = 12,000 meters = 12 kilometers

Xav tau: Qhov nruab nrab ntawm qhov ceev thiab qhov nruab nrab ntawm qhov ceev

Tshuaj:

Qhov nruab nrab ntawm qhov ceev:

Tus neeg rov qab mus rau qhov ceev pib tom qab puag ncig lub duab plaub fab, yog li ntawd qhov kev hloov chaw ntawm tus neeg yog 0 thiab qhov ceev nruab nrab yog 0.

Qhov nruab nrab ceev:

Qhov nruab nrab ntawm qhov ceev = tag nrho qhov deb / lub sijhawm = 12 km / 1 teev = 12 km / teev

2. Qhov kev sib txuas ntawm qhov deb (d) thiab lub sijhawm (t) ntawm ib yam khoom txav tau qhia nyob rau hauv daim duab hauv qab no. Yog tias qhov deb yog nyob rau hauv meters thiab lub sijhawm nyob rau hauv vib nas this, qhov nruab nrab ntawm qhov ceev yog dab tsi.

tshuaj

Qhov nruab nrab ntawm qhov ceev = qhov deb / lub sijhawm sib nrug

Qhov nruab nrab ntawm qhov ceev = 15 meters / 6 vib nas this = 2.5 meters / vib nas this

3. Ib tug noog ya mus rau sab qaum teb nrog 16 m/s hauv 5 vib nas this thiab tom qab ntawd mus rau sab hnub tuaj nrog 12 m/s hauv 5 vib nas this. Qhov nruab nrab ntawm 10 vib nas this yog dab tsi.

Tshuaj:

Qhov ceev ntawm noog mus rau sab qaum teb: 16 meters/ob = 16 meters/1 ob

Tom qab 1 vib nas this, noog txav mus deb li 16 meters

Tom qab 2 vib nas this, tus noog txav mus deb li 2 x 16 = 32 meters

Tom qab 5 vib nas this, tus noog txav mus deb li 5 x 16 = 80 meters

Qhov ceev ntawm noog mus rau sab hnub tuaj: 12 meters/ob = 12 meters/1 ob

Tom qab 1 vib nas this, noog txav mus deb li 12 meters

Tom qab 2 vib nas this, tus noog txav mus deb li 2 x 12 = 24 meters

Tom qab 5 vib nas this, tus noog txav mus deb li 5 x 12 = 60 meters

Kev Hloov Chaw (s):

s = √80 ² + 60 ²

s = √6400 + 3600

s = √10,000

s = 100 meters

Qhov nruab nrab ntawm qhov ceev (v):

v = kev hloov chaw / lub sijhawm

v = 100 meters / 10 vib nas this

v = 10 meters/sib

1. Lo lus nug: Qhov ceev nruab nrab yog dab tsi? Lus teb: Qhov ceev nruab nrab yog qhov kev hloov pauv tag nrho ntawm ib yam khoom faib los ntawm tag nrho lub sijhawm siv. Nws yog ib qho vector ntau thiab muaj ob qho tib si qhov loj thiab kev coj.

2. Lo lus nug: Qhov ceev nruab nrab txawv li cas ntawm qhov ceev nruab nrab? Lus teb: Qhov ceev nruab nrab yog qhov deb tag nrho uas tau mus ncig faib los ntawm lub sijhawm tag nrho uas siv, thiab nws tsis xav txog kev taw qhia. Qhov ceev nruab nrab, ntawm qhov tod tes, xav txog qhov kev hloov pauv tag nrho (kev hloov pauv hauv qhov chaw) thiab nws txoj kev taw qhia.

3. Lo lus nug: Yog tias lub tsheb mus ncig 200 km sab qaum teb thiab tom qab ntawd 200 km sab qab teb hauv tag nrho 8 teev, nws qhov ceev nruab nrab yog dab tsi? Lus teb: Lub tsheb rov qab mus rau nws qhov chaw pib, yog li qhov kev hloov pauv tag nrho yog 0 $km$ . Yog li $ntawd$ , nws qhov ceev nruab nrab yog $0km÷8teev=0km/h.$

4. Lo lus nug: Qhov ceev nruab nrab puas tuaj yeem tsis zoo? Lus teb: Yog, qhov ceev nruab nrab tuaj yeem tsis zoo, nyob ntawm qhov kev taw qhia xaiv. Yog tias ib yam khoom txav mus rau qhov kev taw qhia rov qab ntawm qhov kev taw qhia, nws qhov ceev nruab nrab yuav tsis zoo.

5. Lo lus nug: Vim li cas qhov ceev nruab nrab thiaj yog qhov ntau ntawm vector? Lus teb: Qhov ceev nruab nrab yog qhov ntau ntawm vector vim nws muaj ob qho tib si qhov loj (qhov ceev ntawm cov khoom txav mus los) thiab kev coj (qhov twg cov khoom txav mus los).

6. Lo lus nug: Yog tias daim duab qhia lub sijhawm hloov chaw ntawm ib yam khoom yog ib txoj kab ncaj, koj tuaj yeem hais li cas txog nws qhov ceev nruab nrab? Lus teb: Yog tias daim duab qhia lub sijhawm hloov chaw yog ib txoj kab ncaj, yam khoom muaj qhov ceev tas mus li, thiab nws qhov ceev nruab nrab ntawm txhua lub sijhawm yuav zoo ib yam li nws qhov ceev tam sim ntawd ntawm txhua qhov chaw.

7. Lo lus nug: Qhov loj ntawm qhov nruab nrab ntawm qhov ceev puas tuaj yeem loj dua qhov ceev nruab nrab? Lus teb: Tsis yog, qhov loj ntawm qhov nruab nrab ntawm qhov ceev tsis tuaj yeem tshaj qhov ceev nruab nrab. Feem ntau, lawv tuaj yeem sib npaug yog tias txoj kev thiab kev coj ntawm yam khoom sib xws.

8. Lo lus nug: Koj xam qhov nruab nrab ntawm qhov ceev los ntawm daim duab qhia qhov ceev-lub sijhawm li cas? Lus teb: Qhov nruab nrab ntawm qhov ceev ntawm daim duab qhia qhov ceev-lub sijhawm tuaj yeem nrhiav tau los ntawm kev xam thaj tsam hauv qab daim duab (lossis ntawm daim duab thiab x-axis) thiab faib nws los ntawm tag nrho lub sijhawm.

9. Lo lus nug: Txhais li cas yog tias ib yam khoom muaj qhov nruab nrab ntawm qhov ceev ntawm xoom? Lus teb: Yog tias ib yam khoom muaj qhov nruab nrab ntawm qhov ceev ntawm xoom, nws txhais tau tias nws qhov chaw pib thiab xaus yog tib yam dhau lub sijhawm uas tau xav txog, txawm tias nws txav mus rau lub sijhawm ntawd los xij.