An object has a mass of 46.5 g and a volume of

$$15.5 \mathrm { cm } ^ { 3 }$$

. What is the density of the object? (1)

$$0.3 \mathrm { g } / \mathrm { cm } ^ { 3 }$$

(2)

$$46.5 \mathrm { g } / \mathrm { cm } ^ { 3 }$$

(3)

$$3.0 \mathrm { g } / \mathrm { cm } ^ { 3 }$$

(4)

$$720.8 \cdot g / \mathrm { cm } ^ { 3 }$$

The average diameter of the Milky Way galaxy is about 115,000 light-years. Which choice below correctly expresses this in scientific notation? (1)

$$1 \times 10 ^ { 5 } \text { light-years }$$

(2)

$$115 \times 10 ^ { 5 } \text { light-years }$$

(3)

$$1.15 \times 10 ^ { 5 } \text { light-years }$$

(4)

$$2.3 \times 10 ^ { 10 } \text { light-years }$$

Some scientists estimate that age of the sun and solar system is about

$$4.65 \times 10 ^ { 9 }$$

years. Which choice correctly expresses this value? (1) 465 years (2) 465,000 years (3) 465,000,000 years (4) 4,650,000,000 years

Pumice is an unusual rock because some samples float on water. What does this tell you about pumice? (1) Pumice can be less dense than water. (2) Pumice is most common in high mountain locations. (3) Pumice is usually found in very small pieces. (4) Pumice absorbs water.

Calculate the density of an object having a mass of 17 g and a volume of $3 cm^3.$

Find the density of the piece of lead that has a mass of 49.01 g and a volume of $4.5 \mathrm{cm}^{3}$.