Piv txwv ntawm cov lus nug txog lub zog kinetic

3 Piv txwv ntawm cov lus nug txog lub zog kinetic

1. Cov khoom A thiab B muaj tib lub cev hnyav thiab txhua tus txav mus rau qhov ceev raws li pom hauv daim duab hauv qab no:
Qhov piv ntawm lub zog kinetic ntawm yam khoom A thiab yam khoom B yog ...

A. 1: 2
B. 1: 4
C. 2: 1
D. 4: 1

Kev Sib Tham

Cov khoom A thiab B muaj tib qhov hnyav. Qhov hnyav ntawm cov khoom A thiab B yog cim los ntawm m.
Lub zog Kinetic mis:
EK = ½ mv²
Kev piav qhia: EK = lub zog kinetic, m = pawg, v = qhov ceev
Lub zog Kinetic ntawm yam khoom A :
EK_A = ½ mv² = ½ m 2² = ½ m (4) = 2 m
Lub zog Kinetic ntawm yam khoom B :
EK_B = ½ mv² = ½ m 4² = ½ m (16) = 8 m
Kev sib piv ntawm lub zog kinetic ntawm khoom A thiab khoom B:
EK_A : EK_B
2 m : 8 m
2: 8
1: 4
Cov lus teb yog B.

2. Saib daim duab ntawm lub tsheb npav thiab lub tsheb uas tab tom txav mus los hauv qab no!
Qhov hnyav ntawm lub tsheb npav yog 10.000 kg thiab qhov hnyav ntawm lub tsheb yog 500 kg, yog li qhov sib piv ntawm lub zog kinetic ntawm lub tsheb npav thiab lub zog kinetic ntawm lub tsheb yog ...

A. 2: 1
B. 4: 1
C. 5: 1
D. 20: 1

Kev Sib Tham
Lub zog kinetic ntawm lub tsheb npav:
EK = ½ mv² = ½ (10.000)(10)² = (5000)(100) = 500.000
Lub zog kinetic ntawm lub tsheb:
EK = ½ mv² = ½ (500)(20)² = (250)(400) = 100.000
Qhov kev sib piv ntawm lub zog kinetic ntawm lub tsheb npav thiab lub zog kinetic ntawm lub tsheb yog:
500.000: 100.000
5: 1
Cov lus teb yog C.

3. Saib daim duab!
Ib lub tsheb txav mus los ntawm qhov ceev sib txawv ntawm A mus rau B. Qhov piv ntawm lub zog kinetic uas lub tsheb muaj ntawm qhov chaw A thiab ntawm qhov chaw B yog…
A. 1: 2
B. 1: 4
C. 2: 1
D. 4: 1
Kev Sib Tham
Lub zog kinetic ntawm lub tsheb ntawm qhov chaw A:
EK = ½ mv² = ½ m (10)² = ½ m (100) = 50 m
Lub zog kinetic ntawm lub tsheb ntawm qhov chaw B:
EK = ½ mv² = ½ m (20)² = ½ m (400) = 200 m
Qhov kev sib piv ntawm lub zog kinetic ntawm lub tsheb ntawm qhov chaw A thiab ntawm qhov chaw B yog:
50 m : 200 m
50: 200
1: 4
Cov lus teb yog B.

Qhov chaw nug lus:

Cov Lus Nug Txog Kev Xeem Thoob Tebchaws ntawm Tsev Kawm Ntawv Theem Nrab Qib Siab/Islamic Tsev Kawm Ntawv Theem Nrab Qib Siab Science