---
title: "A simple pendulum consists of a bob of mass 1.8 kg attached to a string of length 2.3 m. The pendulum is held at an angle of 30° from the vertical by a light horizontal string attached to a wall, as shown above."
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url: "https://nerd-notes.com/ubq/23481/"
date_modified: "2024-01-19T07:15:41+00:00"
---

# A simple pendulum consists of a bob of mass 1.8 kg attached to a string of length 2.3 m. The pendulum is held at an angle of 30° from the vertical by a light horizontal string attached to a wall, as shown above.

A simple pendulum consists of a bob of mass 1.8 kg attached to a string of length 2.3 m. The pendulum is held at an angle of 30° from the vertical by a light horizontal string attached to a wall, as shown above.

![Diagram](https://nerd-notes.com/wp-content/uploads/2024/01/2.3m-Pendulumn-.png)

**Part a)** Draw or describe the free-body diagram showing the forces on the bob in the position shown above. *(3 points)*

**Part b)** Calculate the tension in the horizontal string. *(3 points)*

**Part c)** The horizontal string is now cut close to the bob, and the pendulum swings down. Calculate the speed of the bob at its lowest position. *(3 points)*


*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/23481/*