A cube with volume 1 cm³ has of lenght
a. 50 mm each
b. 20 mm each
c. 10 mm each
d. 25 mm each
Answers
Answer:
10 mm each.
Step-by-step explanation:
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Answer:
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Step-by-step explanation:
(a)
1m=100cm
1cm=0.01m
Volume=(1cm)
3
=(0.01m)
3
=10
−6
m
3
(b)
Surface Area of cylinder = Curved Area + Area of top + Area of Base
=2πrh+πr
2
+πr
2
=2πr(r+h)
Given:
r=2cm=20mm
h=10cm=100mm
Surface area =2πr(r+h)=2×3.14×20(20+100)mm
2
=15072mm
2
(c)
Speed =18 km/hr
Converting to m/s
1km=1000m
1 hr=(60×60)s=3600s
1 km/h=
3600s
1000 m
=
18
5
m/s
18 km/h=5m/s
Distance travelled in 1 s=5m
(d)
Relative density =
Densityofwater
Density
=
ρ
w
ρ
ρ
w
=1000kg/m
3
Relative density =11.3
1000
ρ
=11.3
ρ=11.3×1000kg/m
3
Now,
1 kg=1000 g
1 m=100 cm
Putting in ρ
ρ=1.13×10
4
kg/m
3
=1.13×10
4
×
100
3
cm
3
1000g
=11.3 g/cm
3