a) V=20 m/s w km/h b) V=72 km/h w m/s c) V=18 d) l=6 mm w um e) l=2 mm w mm f) s=4 m2 w mm2 g) s=2 cm2 w mm2

A) V=20 m/s w km/h = 72km/ h b) V=72 km/h w m/s = 20m/s c) V=18 km/h w m/s = 5m/s d) l=6 mm w um = 6000um e) l=2 mm w mm = 2mm f) s=4 m2 w mm2 = 4000000mm2 g) s=2 cm2 w mm2 = 200mm2

1 km/h = 1000 m / 3600 s = 10/36 m/s = 5/18 m/s 1 m/s = 0,001 km / (1/3600) h = 0,001·3600 km/h = 3,6 km/h ________________________________________________ 1 mm = 1000 um 1 um = 0,001 mm ________________________________________________ 1 m² = 1000 · 1000 mm² = 10³ · 10³ mm² = 10⁶ mm² 1 cm² = 10 · 10 mm² = 100 mm² ________________________________________________ a) v = 20 m/s = 20 · 3,6 km/h = 72 km/h b) v = 72 km/h = 72 · (5/18) m/s = 4 · 5 m/s = 20 m/s c) v = 18 km/h = 18 · (5/18) m/s = 5 m/s d) l = 6 mm = 6 · 1000 um = 6000 um e) l = 2 um = 2 · 0,001 mm = 0,002 mm f) S = 4 m² = 4 · 10⁶ mm² = 4000000 mm² g) S = 2 cm² = 2 · 100 mm² = 200 mm²