A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). Problem 2.1. What is the period of the disk in seconds when it’s at its final spinning rate? Problem 2.2. What is its angular speed in rad/s when it’s at its final spinning rate? Problem 2.3. Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s2?
A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). Problem 2.1. What is the period of the disk in seconds when it’s at its final spinning rate? Problem 2.2. What is its angular speed in rad/s when it’s at its final spinning rate? Problem 2.3. Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s2?
A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). Problem 2.1. What is the period of the disk in seconds when it’s at its final spinning rate? Problem 2.2. What is its angular speed in rad/s when it’s at its final spinning rate? Problem 2.3. Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s2?
A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.).
Problem 2.1. What is the period of the disk in seconds when it’s at its final spinning rate?
Problem 2.2. What is its angular speed in rad/s when it’s at its final spinning rate?
Problem 2.3. Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s2?
Definition Definition Rate of change of angular velocity. Angular acceleration indicates how fast the angular velocity changes over time. It is a vector quantity and has both magnitude and direction. Magnitude is represented by the length of the vector and direction is represented by the right-hand thumb rule. An angular acceleration vector will be always perpendicular to the plane of rotation. Angular acceleration is generally denoted by the Greek letter α and its SI unit is rad/s 2 .
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