/*! 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 63 A car with 58-cm-diameter tires ... [FREE SOLUTION] | 91Ó°ÊÓ

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A car with 58-cm-diameter tires accelerates uniformly from rest to \(20 \mathrm{m} / \mathrm{s}\) in \(10 \mathrm{s}\). How many times does each tire rotate?

Short Answer

Expert verified
The tire rotates approximately 55 times

Step by step solution

01

Calculate Distance Travelled

We know the initial velocity (u) is 0 m/s (since car is initially at rest) and the final velocity (v) is 20 m/s. [Using the equation of motion \(v = u + at\), we find the acceleration (a) as \(a = (v - u) / t = (20 - 0) / 10 = 2 ms^{-2}\). Consequently, we can calculate the distance travelled by the car using the motion equation \(s = ut + 0.5at^2\). Here, \(s\) is the distance, \(t\) is the time, \(a\) is the acceleration, and \(u\) is the initial velocity. Substituting the given values gives \(s = 0 * 10 + 0.5 * 2 * (10)^2 = 100m\].
02

Calculate the circumference of the tire

The next step is to calculate the circumference of the tire (d represents the diameter of the tire) using the formula \(C = πd\). Thus, the circumference will be \(C = π * 0.58 = 1.822 m\).
03

Find the total number of rotations

Finally, to find out the total number of rotations, we need to divide the total distance traveled by the car by the tire's circumference. This would be \(Number Of Rotations = Total Distance / Tire Circumference = 100 / 1.822 = 54.89 rotations \). Considering a full tire rotation, we get approximately 55 rotations.

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Key Concepts

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

Understanding Kinematics
Kinematics is the branch of classical mechanics that describes the motion of points, bodies (objects), and systems of bodies (groups of objects) without considering the forces that caused the motion. In the context of our problem, kinematics helps us analyze the car acceleration and distance travelled over time without factoring in the force applied to the wheels or the resistance of the road.

When a car accelerates uniformly from rest, the principles of kinematics are used to determine its final velocity, the distance travelled, and how many times the tires rotate. The key aspect of uniform acceleration in this scenario is that it remains constant, meaning that every second, the velocity of the car increases by the same amount. By using kinematic equations—also known as the equations of motion—we can solve for the car's acceleration, the total distance covered, and subsequently use these values to determine the number of tire rotations.
Deciphering Equations of Motion
The equations of motion are a set of formulas that provide a reliable method to solve for various parameters of a body’s motion, such as velocity, distance, acceleration, and time, when the motion is uniformly accelerated. These equations are at the heart of many kinematic problems and are crucial for students to understand the dynamics of an object in motion.

For example, the equation \( v = u + at \) was used to find the car's acceleration. Here, \( v \) represents final velocity, \( u \) represents initial velocity, \( a \) is acceleration, and \( t \) is time. Another key equation, \( s = ut + \frac{1}{2}at^2 \), was used to calculate the distance traveled by the car. These equations are indispensable for solving uniform acceleration problems, which in turn are foundational concepts in physics.
Unraveling Circular Motion
Circular motion pertains to the movement of an object along the circumference of a circle. At any given moment, the direction of the object's velocity is tangent to the circumference, and its acceleration is directed towards the circle’s center. While the problem does not explicitly deal with the full scope of circular motion concepts, it does require an understanding of how the distance travelled by the car relates to the rotation of its tires, which is a form of circular movement.

To solve circular motion problems, one must be familiar with the formula for circumference \( C = \textstyle \textstyle \pi d \), where \( C \) is the circumference and \( d \) is the diameter. In our exercise, by finding the tire’s circumference and dividing the total distance travelled by it, we determine how many times the tire completes a full rotation, which is an application of circular motion principles in a practical context.

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