Fill in the blank. 1. Minerals are substances with a fixed crystal structure and a unique chemical
composition
2. Processing ore sometimes involves or grinding minerals.
3. Prehistoric people used for knives and arrowheads.
4. The average American house contains about Mounds of minerals.
5. Early used rocks as simple tools as early as 2.6 million years ago.

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?