1. The problem statement, all variables and given/known data A metal hangs vertically from one end of a spring. The other end of the spring is tied to a thread that passes over a pulley and is attached to a vibrator, as shown in the figure. The vibrator is now switched on. The frequency of vibration is varied from 0.7f to 1.3f where f is the frequency of vibration of the block in the first part. For the block, show the variation with frequency of the amplitude of vibration. Label this line A. Then same question but now some light feathers are attached to the block to increase air resistance. Draw the new graph. 2. Relevant equations - 3. The attempt at a solution I've always known that the frequency doesn't vary with the amplitude but in this case they say it's a curve with its peak at f and the amplitude never reaches 0. I'm not sure why this is the case. Thanks.