Question

If a rod of 2cm diameter and 30 cm length is connected with a wire of 3 m length and diameter 1 cm, then find the total surface area.​

Answer 1

Answer:

Mark as brainlist answer

Step-by-step explanation:

Radius of rod =

2

2

= 1 cm

Height = 30 cm

Converted to wire of length = 3 m = 300 cm

r = ?

V

1

=V

2

πr

2

h=πR

2

H

π(1)

2

×30=πR

2

×300

R

2

=

10

1

=

10

1

cm=

10

1

cm

Answer 2

Answer:

Step-by-step explanation:

Volume of the wire=Volume of the rod

⇒πr2(300)=π(2/2)^2(30)

$r^2=\frac{\pi (1)^2(30)}{\pi 300}$

$r^2=\frac{1}{10}$

$r=\sqrt{} \frac{1}{10}$

$r=\frac{1}{\sqrt{10} }$

$d=2r=\frac{2}{\sqrt{10} }$

$d=\frac{2\sqrt{10} }{10}$

$d=\frac{\sqrt{10} }{5} cm$