2023 · Q34
The following diagram shows a pendulum at different positions. Which one of the following statement is true?
General KnowledgePhysics
- AThe pendulum has minimum potential energy at positions P and T.
- BThe pendulum has minimum potential energy at positions and S.
- CThe pendulum has minimum potential energy at position R.
- DThe pendulum has same potential energy at all positions.
Explanation
Gravitational potential energy is lowest where the bob is lowest. In the diagram the mid position R is the lowest point of the swing, so potential energy is minimum at R and maximum at the extreme positions P, T (and S). The diagram itself is not present in this text record, so the position labelling follows the published key for this paper. Key disputed: verify against the official UPSC key.