**Problem 2:**A dentist causes the bit of a high-speed drill to accelerate from an angular speed of \(1.50 \times 10^4 \, \text{rad/s}\) to an angular speed of \(3.25 \times 10^4 \, \text{rad/s}\). In the process, the bit turns through \(1.88 \times 10^4 \, \text{rad}\). Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of \(8.00 \times 10^4 \, \text{rad/s}\), starting from rest?\[ \_\_\_ \, \text{s} \]

According to question --- Given data--- Initial angular speed = 1.5 × 104 rad/sec. Final angular…

Answered: 2. A dentist causes the bit of a…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A person sits in a chair that is free to rotate without friction. Intheir hands, they hold two masses: Mass m1 = 5.0 kg a distance r1 = 0.35m from their body and mass m2 = 3.0 kg a distance r2 = 0.75 m from their body. a. At what distance r1 should the person hold mass m1 if they want to change their rotation speed from w1 = 8.0 rad/s to wf = 5.0 rad/s? b. What is the new moment of inertia about the vertical axis when m1 is held at this new distance?
1. The blades of a fan running at low speed turn at 300 rpm. When the fan is switched to high speed, the rotation rate increases uniformly to 430 rpm in 5.30 s. What is the magnitude of the angular acceleration of the blades? rad/s2 f60 ssi f60 0 ssro0
During a very quick stop, a car deceleraes at 7.00 m/s^2.a. What is the angular acceleration of its 0.280-m-radius tires, assuming they do not slip on the pavement?b. How many revolutions do the tires make before coming to rest, given their initial angular velocity is 95.0 rad/s?c. How long does the car take to stop completely?d. What distance does the car travel in this time?e. What was the car’s initial velocity?f. Do the values obtained seem reasonable, considering that this stop happens very quickly?
6. A uniform disk turns at 3.3 rev/s around a frictionless central axis. A nonrotating rod is dropped onto the disk. The rod has the same mass as the disk and length equal to the diameter of the disk. The two objects then turn together at the same rate with the centers lined up vertically. What is the new angular velocity (in rad/s) and new angular frequency (in rev/s)?
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A bicycle wheel has a radius r = 0.24 m and rotates at a constant frequency of f = 79 rev/min. a. Calculate the period of rotation of the wheel in T seconds b. What is the tangential speed of a point on the wheel's outer edge in m/s?
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A fan is turned off, and its angular speed decreases from 10.0 rad/s to 6.3 rad/s in 5.0 s. What is the magnitude of the angular acceleration of the fan? 0.86 rad/s2 O 0.74 rad/s2 O 0.37 rad/s2 O 11.6 rad/s2 1.16 rad/s2
A spinning disk completes 2.9 revolutions.a. The displacement in radians is...b. It takes 2.3 s to do the 2.9 revolutions. Find its average angular velocity.c. The disk started rotating from rest. Its final angular velocity was 2.5 rad/s2 Find its average angular acceleration.

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