height of a person :cm :: length of your sharpened pencil lead : ___?
Answers
Answer:
Sharpened pencil Reading at one end = 2.0 cm.
Sharpened pencil Reading at the other end = 12.1 cm.
Length of the pencil = Difference between two ends.
= 12.1 cm. – 2.0 cm.
= 10.1 cm.
The length of your sharpened pencil lead is suitable to measure in a millimetre (mm) unit.
Physical quantities are those quantities that can be measured. Length, mass, time, density, work, pressure, energy, etc are some examples of physical quantities.
They are measured by using a reference standard called unit. Length is measured in units like decimetre (dm), millimetre (mm), centimetre(cm), metre (m), kilometre (km), etc. Among them, dm is the smallest unit and km is the biggest unit, and also the SI unit of length.
Relation between various units of length:
- 1 km=1000 m
- 1 m=100 cm
- 1 cm=10 mm
- 1 dm= 10cm
Thus, a sharpened pencil lead has a shorter length, and hence, its length is suitable to measure in millimetre (mm) unit.