A Wind Farm Generator Uses a Two-Bladed Propeller Mounted on a Pylon

question 123

Multiple Choice

A wind farm generator uses a two-bladed propeller mounted on a pylon at a height of 20 m, as shown in the figure. The width of the pylon is very narrow, and the length of each propeller blade is 12 m. A tip of the propeller breaks off just when the propeller is vertical. The fragment flies off horizontally, falls, and strikes the ground at point P with negligible air resistance. Just before the fragment broke off, the propeller was turning uniformly, taking 1.2 s for each rotation. How far is point P from the base of the pylon?

• A) 120 m
• B) 130 m
• C) 140 m
• D) 150 m
• E) 160 m

---

Definitions:

France

A Western European country known for its rich history, cultural heritage, and significant contributions to art, philosophy, and science.

Canada

A country in North America, known for its vast wilderness, multicultural cities, and bilingual (English and French) heritage.

Modern Passenger Plane

A contemporary aircraft designed for the commercial transportation of passengers, featuring advancements in safety, comfort, and efficiency.

Introduction

An initial section that leads into the subject matter, providing a preview or context.