Question

The diameter of a metallic ball is 4.2 cm. What is the mass of the ball, if the density of
the metal is 8.9 g per cm"?​

Answer 1

Answer:

345.3912 gm

Step-by-step explanation:

mass =volume x density

8.9x38.808=345.3912 gm

Answer 2

Answer:

$\\ \sf \: Radius = \frac{4.2}{2} = 2.1 \: cm \\ \\ \\ \sf \: volume = \frac{4}{3} \: \pi {r}^{3} \\ \\ \\ \sf \implies \: \frac{4}{3} \times \frac{22}{7} \times 2.1 \times 2.1 \times 2.1 \\ \\ \\ \implies \sf \: 38.808 \: \: {cm}^{3}$

$\\ \large{ \underline{ \boxed{ \sf{Density = \frac{mass}{volume} }}}} \\ \\ \\ \implies \sf \: mass = density \times volume \\ \\ \\ \implies \sf \: 8.9 \times 38.808 \: \: g \\ \\ \\ \implies \sf \: 345.3912 \: \: g$