Question -
Answer -
(a) 1 cm =
Volume of the cube = 1 cm3
But,1 cm3 = 1 cm × 1 cm × 1 cm =
∴1 cm3 = 10–6 m3
Hence, the volume of a cube of side 1 cm is equal to 10–6 m3.
(b) The total surface area of a cylinder of radius r andheight h is
S = 2πr (r + h).
Given that,
r = 2 cm = 2 × 1 cm = 2 × 10mm = 20 mm
h = 10 cm = 10 × 10 mm = 100mm
= 15072 = 1.5 × 104 mm2
(c) Using the conversion,
1km/h =
Therefore, distance can be obtained using the relation:
Distance = Speed × Time = 5 × 1 = 5 m
Hence, the vehicle covers 5 m in 1 s.
(d) Relative density of a substance is given by the relation,
Relativedensity =
Density of water = 1 g/cm3
Again, 1g =
1 cm3 = 10–6 m3
1g/cm3 =
∴ 11.3 g/cm3 =11.3 × 103 kg/m3