1. The problem statement, all variables and given/known data How do I calculate the propulsive force produced by a speaker? 3. The attempt at a solution According to the wikipedia page on sound (http://en.wikipedia.org/wiki/Sound) a jackhammer 1m distant will generate 2 Pa of pressure. A Pascal is 1 N/m^2. So, a speaker that had 1 m^2 of surface area would produce 2 N of force away from the speaker if it produced that sound. Is that correct? If I attached a speaker like that on the back of a boat, it should produce a continuous 2N of force to push the boat forward.