/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 21 Between 1911 and 1990 , the top ... [FREE SOLUTION] | 91Ó°ÊÓ

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Between 1911 and 1990 , the top of the leaning bell tower at Pisa, Italy, moved toward the south at an average rate of \(1.2 \mathrm{~mm} / \mathrm{y}\). The tower is \(55 \mathrm{~m}\) tall. In radians per second, what is the average angular speed of the tower's top about its base?

Short Answer

Expert verified
The average angular speed is approximately \(6.93 \times 10^{-11}\) rad/s.

Step by step solution

01

Understand the problem

We are asked to find the average angular speed in radians per second of the leaning tower's top about its base. We know the top moves south at an average rate of \(1.2 \text{ mm/year}\) and the tower's height is \(55 \text{ m}\).
02

Convert linear speed to meters per year

The movement of the top is given in millimeters per year. First, we convert this to meters per year. Since \(1 \text{ m} = 1000 \text{ mm}\), we find: \(1.2 \text{ mm/y} = \frac{1.2}{1000} \text{ m/y} = 0.0012 \text{ m/y}\).
03

Calculate the angular speed in radians per year

Suppose the movement can be approximated as part of a circle with the tower height as the radius. The angular speed \( \omega \) in radians per year is given by \( \omega = \frac{\text{linear speed}}{\text{radius}} \). Thus, \( \omega = \frac{0.0012}{55} \text{ rad/year}\).
04

Convert angular speed to radians per second

Convert the speed from radians per year to radians per second. There are \(365.25 \times 24 \times 60 \times 60 = 31,557,600\) seconds in a year. So, \( \omega = \frac{0.0012}{55} \div 31,557,600 \text{ rad/s} \approx 6.93 \times 10^{-11} \text{ rad/s}\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Linear Speed
Linear speed is a measure of how quickly an object moves along a path, whether it's a straight line or a curve. It is expressed as the distance an object travels divided by the time it takes to travel that distance. In the case of the Leaning Tower of Pisa problem, the linear speed refers specifically to the rate at which the top of the tower moves southward.
In this exercise, the linear speed is given in millimeters per year at an average rate of 1.2 mm/y. Since linear speed typically uses the metric of meters per second in physics, we convert millimeters to meters by acknowledging that 1000 mm equals 1 meter. This conversion is essential for computations and helps standardize units for easier understanding and application in further steps.
This concept further ties into calculating angular speed, as understanding how fast a point on an object moves linearly around a circle is fundamental to determining angular movement. Linear speed serves as the foundation of this transition from linear motion to rotational motion.
Radians Conversion
Radians are a unit of angular measure in mathematics and physics. They are used to express angles in a circle where the angle subtended by a radius equal to the arc length of the circle. One complete revolution of a circle equals 2Ï€ radians, so understanding how to work with this unit is essential for solving problems involving circular motion.
In our exercise, after computing the linear speed of the Leaning Tower of Pisa's top as it moves in a circular arc, converting this speed to an angular speed involves expressing it in terms of radians. This means dividing the linear speed by the tower's height, which is treated as the radius of the circular path. This gives us the angular speed in radians per year, which is then further converted to radians per second.
This conversion is crucial for accuracy and uniformity in scientific calculations, ensuring that results are consistent and easily comparable in various contexts.
Leaning Tower of Pisa
The Leaning Tower of Pisa is not just an architectural masterpiece but also a fascinating case study in the physics of motion. Its lean is an unintended yet significant deformation that provides a real-world application of physics concepts like linear and angular speed.
The tower's inclination results in a unique movement pattern of its topmost point, as it deviates from the vertical. This motion, although minuscule, requires careful measurement and analysis over time, providing a useful example for converting real-world phenomena into understandable physics problems.
Working through exercises involving real structures like the Leaning Tower lets students connect theoretical knowledge with practical scenarios, making learning more engaging and meaningful. It's a way to see how abstract physics laws play out in reality.
Physics Problem Solving
Physics problem solving involves breaking down a question into manageable steps, applying relevant formulas, and converting units as needed for accuracy and clarity.
The exercise involving the Leaning Tower of Pisa demonstrates this approach beautifully.
  • First, understanding the core of what the problem asks for: the conversion from a known linear movement to an angular speed.
  • Second, involves unit conversion and application of formulas like \(\frac{\text{linear speed}}{\text{radius}}\) for angular measurement.
  • Finally, converting large time frame measurements (yearly behaviors) into smaller time unit expressions (seconds) for precise scientific communication.
This structured approach allows students to handle complex scenarios by dissecting them into simpler tasks, making the process of finding a solution less daunting and more logical. It emphasizes the importance of methodical thinking in physics and other scientific disciplines.

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