Question

1.) a copper penny has a mass of 3.1 g and a volume of 0.35 cm^3. what is the dencity of the copper penny?

2.) A block of wood has the dimensions 7.0 cm x 10.0 cm x 5.0 cm. What is the
volume of the block of wood?

3.) A graduated cylinder has a volume of 50.0 ml of water. After a rubber cork is
placed in the graduated cylinder, the volume of the water rises to 53.0 ml. If
the mass of the rubber cork is 4.3 g, what is its density?

4.) Calculate the volume of a book with a density of 9.9 g/cm3 and a mass of 58.5 g.

5.) Find the mass of iron if its density is 6.7 g/ml and it has a volume of 5 ml.

Answer 1

1.)

density is found by
`\rho=(m)/(V)`

`\rho=(3.1)/(0.35)\\\\ \rho=8.857 g/cm^3`

2.)

Volume is
`lwh`

7*10*5

V=350
`cm^3`

3.)

using the density formula

`\rho=(m)/(V)`

`\rho=(4.3)/(3)`

`\rho=1.43g/ml`

4.)

rearrange the density formula for V

`V=(m)/(\rho)`

`V=(58.5)/(9.9)\\\\ V=5.909cm^3`

5.)

rearrange the density formula for
`m`

`m=\rho V\\\\m=(6.7)(5)\\\\m=33.5g`