bonsoir
35 km / h = 35 000 : 3 600 = 9.7 m /s
2.4 m /s = 0.0024 * 3 600 = 8.6 km /h
3 * 10 ⁵ km / an = 300 000 km / an = 300 000 km en 8 760 h = 31 536 000 s
300 000 000: 31 536 000 ≅ 9.5 m /s
274 dm / min = 27.4 : 60 = 0.5 m /s
289 m / min = 0.289 * 60 = 17.3 km /h
Bonsoir,
a) 35 km = 35 000 m
1 h = 3 600 s
donc 35 km/h = (35 000 ÷ 3 600) m/s
= 9,72222222...... m/s
≅ 9,7 m/s
b) 2,4 m/s = (2,4 × 3 600) m/h
= 8 640 m/h
= 8,64 km/h
≅ 8,6 km/h
c) 3 × 10⁵ km = 300 000 km = 300 000 000 m
1 an = 365 j = (365 × 24) h = (365 × 24 × 3 600) s = 31 536 000 s
donc 3 × 10⁵ km/an = (300 000 000 ÷ 31 536 000) m/s
= 9,512973.... m/s
≅ 9,5 m/s
d) 274 dm = 27,4 m
1 mn = 60 s
donc 274 dm/min = (27,4 ÷ 60) m/s
= 0,4566666...... m/s
≅ 0,5 m/s
e) 289 m = 0,289 km
1 mn = 1/60 h
donc 289 m/min = (0,289 ÷ 1/60) km/h
= 17,34 km/h
≅ 17,3 km/h
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Verified answer
bonsoir
35 km / h = 35 000 : 3 600 = 9.7 m /s
2.4 m /s = 0.0024 * 3 600 = 8.6 km /h
3 * 10 ⁵ km / an = 300 000 km / an = 300 000 km en 8 760 h = 31 536 000 s
300 000 000: 31 536 000 ≅ 9.5 m /s
274 dm / min = 27.4 : 60 = 0.5 m /s
289 m / min = 0.289 * 60 = 17.3 km /h
Verified answer
Bonsoir,
a) 35 km = 35 000 m
1 h = 3 600 s
donc 35 km/h = (35 000 ÷ 3 600) m/s
= 9,72222222...... m/s
≅ 9,7 m/s
b) 2,4 m/s = (2,4 × 3 600) m/h
= 8 640 m/h
= 8,64 km/h
≅ 8,6 km/h
c) 3 × 10⁵ km = 300 000 km = 300 000 000 m
1 an = 365 j = (365 × 24) h = (365 × 24 × 3 600) s = 31 536 000 s
donc 3 × 10⁵ km/an = (300 000 000 ÷ 31 536 000) m/s
= 9,512973.... m/s
≅ 9,5 m/s
d) 274 dm = 27,4 m
1 mn = 60 s
donc 274 dm/min = (27,4 ÷ 60) m/s
= 0,4566666...... m/s
≅ 0,5 m/s
e) 289 m = 0,289 km
1 mn = 1/60 h
donc 289 m/min = (0,289 ÷ 1/60) km/h
= 17,34 km/h
≅ 17,3 km/h