Question

A hollow ball is made of rubber that is 1 centimeter thick. The ball has a radius of 5 centimeters at the outside surface.

Answer 1

Answer:  A. $255.4\ cm^3$

Step-by-step explanation:

Given: The outer radius of the ball (R)= 5 centimeters

The inner radius of the ball (r)= Outer radius - thickness

$=5-1=4\text{ centimeters}$

Now, the volume of the hollow ball is given by :-

$V=\frac{4}{3}\pi R^3-\frac{4}{3}\pi r^3\\\\\Rightarrow V=\frac{4}{3}\pi (R^3-r^3)\\\\\Rightarrow V=\frac{4}{3}(3.14)(5^3-4^3)\\\\\Rightarrow V=\frac{4}{3}(3.14)(61)\\\\\Rightarrow V=255.386666667\approx255.4\ cm^3$

Hence, the approximate volume of rubber used to make the ball=$255.4\ cm^3$

Answer 2

The answer is
a:255.4cm^3