During a class demonstration, a model volcano “erupts” when the teacher adds vinegar to baking soda inside the volcano. Vinegar contains acetic acid, and baking soda is sodium hydrogen carbonate. When they are combined, a reaction occurs and bubbles form. Which gas is in the bubbles, and why do the bubbles form? Oxygen gas forms because an acid reacts with a metal Carbon dioxide gas forms because an acid reacts with carbonate ions Carbon dioxide gas forms because an acid reacts with a metal Oxygen gas forms because an acid reacts with carbonate ions

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?