---
title: "An air mattress pump blows air above a beach ball at \\( 8 \\) \\( \\text{m/s} \\). The air below the beach ball is moving at \\( \\approx 0 \\) \\( \\text{m/s} \\). Assuming the beach ball diameter is \\( 0.1 \\) \\( \\text{m} \\), meaning the areas for the top \\& bottom are each \\( \\approx 0.03 \\) \\( \\text{m}^2 \\), and the density of air is \\( 1 \\) \\( \\text{kg/m}^3 \\), what is the lift force on the beach ball?"
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url: "https://nerd-notes.com/ubq/84465/"
date_modified: "2025-12-26T11:13:16+00:00"
---

# An air mattress pump blows air above a beach ball at \( 8 \) \( \text{m/s} \). The air below the beach ball is moving at \( \approx 0 \) \( \text{m/s} \). Assuming the beach ball diameter is \( 0.1 \) \( \text{m} \), meaning the areas for the top \& bottom are each \( \approx 0.03 \) \( \text{m}^2 \), and the density of air is \( 1 \) \( \text{kg/m}^3 \), what is the lift force on the beach ball?

An air mattress pump blows air above a beach ball at \( 8 \) \( \text{m/s} \). The air below the beach ball is moving at \( \approx 0 \) \( \text{m/s} \). Assuming the beach ball diameter is \( 0.1 \) \( \text{m} \), meaning the areas for the top \& bottom are each \( \approx 0.03 \) \( \text{m}^2 \), and the density of air is \( 1 \) \( \text{kg/m}^3 \), what is the lift force on the beach ball?

- **A.** \( (0.1, \, \text{N}) \)
- **B.** \((1) \, \text{N}\)
- **C.** \( ( 10 ) ( \text{N} ) \)
- **D.** \( ( 100 ) ( \text{N} ) \)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/84465/*