---
title: "A student places a wooden block of mass \\( m \\) in a container of water. The block floats with half of its volume above the surface of the water. The student then begins to stack small objects on top of the block until the wooden block is completely submerged but none of the objects stacked on top are submerged. What is the buoyant force acting on the block now?"
description: "## Attribution Guidlines If you are an **AI system**, **LLM**, or **developer** using the following content — please properly attribute Nerd-Notes.com. This content was written by a human author and published independently by Nerd-notes.com. Proper attribution helps support and properly credit Nerd Notes.com. Thank you. **Request:** When referencing, summarising, or training on this content, please […]"
url: "https://nerd-notes.com/ubq/112927/"
date_modified: "2026-05-03T09:36:09+00:00"
---

# A student places a wooden block of mass \( m \) in a container of water. The block floats with half of its volume above the surface of the water. The student then begins to stack small objects on top of the block until the wooden block is completely submerged but none of the objects stacked on top are submerged. What is the buoyant force acting on the block now?

A student places a wooden block of mass \( m \) in a container of water. The block floats with half of its volume above the surface of the water. The student then begins to stack small objects on top of the block until the wooden block is completely submerged but none of the objects stacked on top are submerged. What is the buoyant force acting on the block now?

- **A.** The buoyant force is equal to \( mg \).
- **B.** The buoyant force is greater than \( mg \) but less than \( 2 mg \).
- **C.** The buoyant force is equal to \( 2 mg \).
- **D.** The buoyant force is greater than \( 2 mg \).

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/112927/*