---
title: "A typical \\( 68 \\)-kg person can maintain a steady energy expenditure of \\( 480 \\) \\( \\text{W} \\) on a bicycle. Approximately how many Calories are “burned” when the person rides a bicycle for \\( 15 \\) minutes? A typical energy efficiency for the human body is \\( 25\\% \\), which takes into account the release of thermal energy."
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url: "https://nerd-notes.com/ubq/81065/"
date_modified: "2025-12-14T03:34:54+00:00"
---

# A typical \( 68 \)-kg person can maintain a steady energy expenditure of \( 480 \) \( \text{W} \) on a bicycle. Approximately how many Calories are “burned” when the person rides a bicycle for \( 15 \) minutes? A typical energy efficiency for the human body is \( 25\% \), which takes into account the release of thermal energy.

A typical \( 68 \text{-kg} \) person generates a steady mechanical power output of \( 120 \text{ W} \) at the pedals of a bicycle. Approximately how many Calories are “burned” (total metabolic energy expended) when the person rides a bicycle for \( 15 \text{ minutes} \)? A typical energy efficiency for the human body is \( 25\% \), which takes into account the release of thermal energy. Note (\( 1 \text{ Cal} = 4186 \text{ J} \)).

- **A.** \( 100 \) \( \text{Cal} \)
- **B.** \( 200 \) \( \text{Cal} \)
- **C.** \( 410 \) \( \text{Cal} \)
- **D.** \( 480 \) \( \text{Cal} \)
- **E.** \( 570 \) \( \text{Cal} \)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/81065/*