---
title: "A light string is attached to a massive pulley of known rotational inertia \\( I_P \\), as shown in the figure. A student must determine the relationship between the torque exerted on the pulley and the change in the pulley’s angular velocity when the torque is applied for \\( 2.0 \\) \\( \\text{s} \\). In addition to a stopwatch to measure the time interval, what two measurements could the student make in order to determine the relationship? Select two answers."
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url: "https://nerd-notes.com/ubq/103994/"
date_modified: "2025-10-26T18:02:18+00:00"
---

# A light string is attached to a massive pulley of known rotational inertia \( I_P \), as shown in the figure. A student must determine the relationship between the torque exerted on the pulley and the change in the pulley’s angular velocity when the torque is applied for \( 2.0 \) \( \text{s} \). In addition to a stopwatch to measure the time interval, what two measurements could the student make in order to determine the relationship? Select two answers.

A light string is attached to a massive pulley of known rotational inertia \( I_P \), as shown in the figure. A student must determine the relationship between the torque exerted on the pulley and the change in the pulley’s angular velocity when the torque is applied for \( 2.0 \) \( \text{s} \). In addition to a stopwatch to measure the time interval, what two measurements could the student make in order to determine the relationship? Select two answers.

![Diagram](https://nerd-notes.com/wp-content/uploads/2025/10/A-light-string-is-attached-to-a-massive-pulley-of-known-rotational-inertia-_-I_P-_-as-shown-in-the-figure.-A-student-must-determine-the-relationship-between-the-torque-exerted-300x300.png)

- **A.** Mass of the pulley
- **B.** Radius of the pulley
- **C.** Entire length of the string
- **D.** Force exerted on the string to turn the pulley

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/103994/*