---
title: "An old record player could bring a disk up to its 45 RPM speed in less than a second. If the same size disk can also be brought up to a speed of 75 RPM in about the same amount of time on another player, compare the two torques."
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url: "https://nerd-notes.com/ubq/39486/"
date_modified: "2025-10-25T01:42:30+00:00"
---

# An old record player could bring a disk up to its 45 RPM speed in less than a second. If the same size disk can also be brought up to a speed of 75 RPM in about the same amount of time on another player, compare the two torques.

An old record player could bring a disk up to its \(45\) RPM speed in less than a second. If the **same** size disk can also be brought up to a speed of \(75\) RPM in about the same amount of time on another player. Compare the torques exerted by each record player.

- **A.** The torques would be the same as the moment of inertia of the two disks are the same.
- **B.** The torques would be the same because of the conservation of angular momentum.
- **C.** The torque would be larger in the second case as it requires a greater angular acceleration.  
- **D.** The torque would be larger in the second case as it entails both a larger force and a larger lever arm.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/39486/*