ABSTRACT
Consider a perfect pendulum oscillating in a vertical plane, which is supported in a box (see Figure 17.1). An oscillating pendulum in a box. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9780429136528/397e01c1-e101-4a47-b552-a910642bbb8c/content/fig17_1_B.tif"/>
