One barking dog delivers about 1 mW of power, which is assumed to be uniformly distributed in all directions. If you are 2.00 m away, what is the intensity level (in dB) of twelve identical barking dogs very close to each other

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.