The mean radius of the earth is 6,371 km, and 70.8% of its surface is covered by water. what is the surface area of the earth covered by land?

Using complete sentences, explain how to predict the products and balance the reaction between sulfuric acid and potassium hydroxide.

Which statement best describes the flow of energy in this scenario

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?