A boat(1500kg) is on a lake exibiting SHM with an amp of 20cm bobbing on the waves. The boat takes 3.5s to make one complete up and down cycle. When the boat is at its highest point it is at the same level as the dock. You will only board the boat if it is within 10cm of the dock. How much time do you have to board the boat per cycle. Can someone give me a hint on how to start with this problem. I know I'm looking for the interval in the sine wave where f(x) is greater than 10cm. Any ideas?