A computer hard disk starts from rest, then speeds up with an angular acceleration of 190 rad/s2 until it reaches its final angular speed of 7,200 rmp
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- The end of the cutting cord on a gas-powered weed cutter is 0.21 m in length. If the motor starts from rest and accelerates with an angular acceleration of 52 rad/s² for 1.82 s then continues with uniform angular velocity. What is the rpm of the cutting cord after the 1.82 s?The blades in a blender rotate at a rate of 4.250 E+3 rpm. When the motor is turned off during operation, the blades slow to rest in 4.75 s. What is the angular acceleration (a positive number in rad/s2) as the blades slow down? (Could you explain how I convert an equation that are listed as E + a number and what equation I can use to find angular acceleration. Thank you.)A disc rotates at 90 rpm (revolutions per minute).What is the angular speed (in rad/s)?
- As you drive down the road at 18 m/s, you press on the gas pedal and speed up with a uniform acceleration of 1.22 m/s² for 0.60 s. You may want to review (Page 312). If the tires on your car have a radius of 33 cm, what is their angular displacement during this period of acceleration? Express your answer using two significant figures. Δθ = Templates Symbols undo redo reset keyboard shortcuts help radA 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?An engine flywheel initially rotates counterclockwise at 6.83 rotations/s. Then, during 25.1 s, its rotation rate changes to 2.19 rotations/s clockwise. Find the flywheel's average angular acceleration (including its sign) in radians per second squared. Define counterclockwise rotation as positive. what is the average angular acceleration?
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