cube. cube. B. Fill in the blanks. 1. To measure the volume of a sugar crystal, you will use a 2. To measure the volume of an eraser, you will use a 3. To measure the volume of a trunk, you will use a cube. 49 cm C. Fill in the blanks. 1. The area of a rectangle whose length is 6 cm and breadth 4 cm is 2. The area of a square whose side is 7 cm will be - All rectangles with perimeter 12 cm have seene area. The area of a rectangle is 36 sq. cm. The rectangle is divided into two triangle of equal area. The area of each triangle is sq. cm. The volume of a millimetre cube is Box A contains 15 centimetre cubes and box B contains 22 such cubes. Box has a greater volume. The volume of 10 cubes each of side 10 cm is
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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
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