Question

Cylindrical candle 8cm tall and radius 2cm find the mass of the candle if 1cubic centimeter of wax weigh 2.5 grams

Answer 1

Answer:

first of all find voume

vol=πr^2h

then find mass

Answer 2

$\sf{height \: = \: 8cm} \\ \\ \sf{radius \: = \: 2cm } \: \\ \\ \mathcal{so \:volume \:of \: cylindrical \: camdle \: would \: be : } \\ \\ \boxed {\pink{ volume = \pi \: \times \: {r}^{2} \times h}}$

$\bold{volume = 3.14 \times 8 \times 2} \\ \\ \bold{volume = 3.14 \times 16} \\ \\ \bold{volume = 50.40 {cm}^{3} }$

Solving @ of 1cubic cm = 2.5 grams

$\mathcal{if \: 1 \: cm {}^{3} \: = \: 2.5 \: grams \: } \\ \\ \mathcal{then} \\ \\ \mathcal{50.40 {cm}^{3} \: will \: be \: equal \: to \: x } \\ \\ \star \: \bold{using \: direct \: propotion \:we \: get : } \\ \\ \mathcal{weight \: of \: 50.40 {cm}^{3} of \: wax = 2.5 \times 50.40}$

$\mathcal{weight \: of \: 50.40 {cm}^{3} =126 \: gram } \\ \\ \\ { \boxed{\bold {\purple{answer = 126 \: gram}}}}$