1. Intro to Physics Units

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?

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.

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).

A plumb bob (a mass m hanging on a string) is deflected from the vertical by an angle θ due to a massive mountain nearby (Fig. 6–37).

(b) Make a rough estimate of the mass of Mt. Everest, assuming it has the shape of a cone 4000 m high and base of diameter 4000 m. Assume its mass per unit volume is 3000kg per m³.

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The Near Earth Asteroid Rendezvous (NEAR) spacecraft, after traveling 2.1 billion km, orbited the asteroid Eros with an orbital radius of about 20 km. Eros is roughly 40km x 6km x 6km. Assume Eros has a density (mass/volume) of about 2.3 x 10³ kg/m³. If Eros were a sphere with the same mass and density, what would its radius be?

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.