There are 100 centimetres in a metre
There are 0.01 metres in a centimetre
If by ruler, you are referring to the foot long ruler which contains metric and imperial measurements along the side, it has metric measures up to 30 centimetres, which is equal to 0.3 metres.
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There are 300 millimeters in a 30 cm ruler.
One millimeter is 1/1000 of a metre.
One centimeter is 1/100 of a metre.
120Ruler sizes can vary from 15 to 60 centimeters. Most common rulers are 32cm long, with measures from 0 to 30cm. (30cm ruler, 1 foot). Some fold out rulers can be 120cm, although are rare. Some 30cm rulers can be folded in half to create a doule-thickness 15cm long ruler, but folded out for a 30cm.
By unit of length and distance and conversion ,we can say that 1 cm=10 mm 30 cm=300 mm hence .both are equal
1 meter equals 100 centimeters. 6 meters equals 600 centimeters. Each ruler is 30 centimeters. In order to find the answer you must divide 600 by 30. 20 rulers, end to end, would reach 6 meters.
My common 30m builders steel tape is graduated in cm and m.
car weight: 1300 kg - 13000 N tire-asphalt friction = 0,15cm Tire radius = 30cm F= 0.15*13000/30 = 6,5 N