Question

1.  A hollow metal sphere has an outer diameter of 4cm and an inside diameter of 3.85 cm

a.      What is the thickness in cm?

b.     What is the outer volume cm³?

c.      What is the inner volume cm³?

d.     What is the volume of the metal sphere cm³?

Answer 1

a)

$$s=0.5(4-3.85)=0.075\ cm$$

b)

$$V_{out}=\frac{4}{3}\pi(4)^3=268\ cm^3$$

c)

$$V_{in}=\frac{4}{3}\pi(3.85)^3=239\ cm^3$$

d)

$$V=268-239=29\ cm^3$$