Question

the radius of solid gold sphere is 0.25cm.If density of gold is 19.6 g cm3.calculate its mass

Answer 1

$mass = volume \times density$
$= \frac{4}{3} \times \frac{22}{7} \times {0.25}^{3} \times 19.6$
$= \frac{4}{3} \times 22 \times {0.25}^{3} \times 2.8$
=
$88 \times 0.015625 \times 2.8 \div 3$
$1.28333$

Answer 2

$mass = \: volume \times density \\ or, \: \frac{4}{3} \times \frac{22}{7} \times 0.25³ \times 19.6 \\ or, \: \frac{4}{3} \times 22 \times 0.25³ \times 2.8 \\ °•°88 \times 0.015625 \times 2.8 \div 3 = 1.28333$