The quantity called mass density is the mass per unit volume of a substance. What are the mass densities in basic SI units of the following objects? A 215 cm³ solid with a mass of 0.0179 kg.

Potassium bromide (KBr) has a density of $2.75\times {10}^3$ kg/m³ and the same crystal structure as NaCl. The mass of a potassium atom is $6.49\times {10}^{-26}$ kg, and the mass of a bromine atom is $1.33\times {10}^{-25}$ kg. Calculate the average spacing between adjacent atoms in a KBr crystal.

A wooden cylinder has a radius of 3.5 cm and a height of 6 cm. If the mass is 161 g, what is the density of the wooden cylinder?

Copper has a density of 8.96 g/cm³. If a single copper atom as a mass of 1.055×10^-25 kg, what is the volume of a copper atom?

In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm3. What would be the radius of a sphere of this material that has a critical mass?

The nucleus of a uranium atom has a diameter of 1.5×10⁻¹⁴ m and a mass of 4.0×10⁻²⁵ kg . What is the density of the nucleus?

A standard baseball has a circumference of approximately 23 cm. If a baseball had the same mass per unit volume (see Tables in Section 1–4) as a neutron or a proton, about what would its mass be?

The density of an object is defined as its mass divided by its volume. Suppose a rock's mass and volume are measured to be 6 g and 2.8325 cm³. To the correct number of significant figures, determine the rock's density (mass/volume).