Question

please complete in a process

Answer 1

Hlo friend.. Cutiepie Here..

Here is ur answer :

1. Volume of water tank =
$lbh$

Length = 4.2 m

Breadth = 3 m

Height = 1.8 m

V = 4.2 × 3 × 1.8

= 22.68 m³

Capacity of water tank, in litres = 22,680 litres ( 1 m³ = 1000 L)

2. Volume of 1 cube =
${(side)}^{3}$

Side = 0.5 cm

Volume of 1 cube = (0.5)³

= 0.125 cm³

Volume of a big cube = 8cm³

No. Of cubes =
$\frac{volume \: of \: big \: cube}{volume \: of \: 1 \: cube \: }$

$= \frac{8}{0.125}$

$= \frac{8000}{125}$

$= 64$

ANS - 64 cubes

3. Volume of cylinder =
$\pi {r}^{2} h$
Radius = r

Height = h

(a) Height is doubled.

Height = 2h

Radius = r

Volume =
$\pi {r}^{2} 2h$

Therefore, volume is increased 2 times.

(b) height is doubled and the radius is halved.

Height = 2h

Radius =
$\frac{r}{2}$

Volume =
$\pi { (\frac{r}{2}) }^{2} 2h$

$\pi \frac{r}{4} 2h$

Therefore, volume will be halved.

(c) height remains the same and the radius is halved.

Height = h

Radius =
$\frac{r}{2}$

Volume =
$\pi (\frac{r}{2} )^{2} h$

$= \pi \frac{r}{4} h$

Therefore, volume will be one - fourth.

HOPE IT HELPS YOU...

REGARDS
@sunita