6. which is a characteristic of chemical equilibrium but not physical equilibrium?
nds
eactions
a the reactants and products are different substances.
b the changes occur at the same rate.
reactions
c only chemical equilibrium occurs in a closed system.
od the reactants and products are the same substances.
40
est
5. acids and

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?