Question

1:how many balls each of radius 2cm can be made by melting a big ball whise radius is 8cm?

2:Three cubes each of side 5cm are joined end to end .What is the surface area of the resulting cuboid?​

Answer 1

Step-by-step explanation:

512 numbers

Answer. Answer : 512 numbers of balls can be made of radius 1 cm from a solid sphere of lead of radius 8 cm. Hence , 512 numbers of balls can be made of radius 1 cm of a solid sphere of radius 8 cm

Answer 2

Step-by-step explanation:

1. No. of balls = Volume of share / Volume of each ball = 4 / 3π × 8 × 8 × 8 / 4 / 3π × 2 × 2 × 2 = 64

2. The dimensions of the cuboid so formed are as under:

L= length = 15cm,b= breadth = 5cm, h= height = 5cm

Surface area of the cuboid =2(15×5+5×5+15×5)cm²

= 2(75+25+75)cm²

= 350 cm²