An electric fan is running on HIGH. After the speed setting is changed to LOW, the angularspeed reduces to 800 rpm in 1.75 s. If the angular deceleration is a constant 42.0 rad/s², thenfind (a) the initial angular speed of the fan (when it was on HIGH) and (b) the number ofrevolutions that the fan turned through as it slowed from HIGH to LOW. (c) Include adiagram of the situation.

To solve this problem, we need to use the equations of rotational motion. Given that the angular…

Answered: An electric fan is running on HIGH.…

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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Similar questions

Most gasoline engines in today's automobiles are belt driven. This means that the crankshaft, a rod which rotates and drives the pistons, is timed to the camshaft, the mechanism which actuates the valves, by means of a belt. Starting from rest, assume it takes t = 0.0100 s for a crankshaft with a radius of r₁ = 3.75 cm to reach 1550 rpm. If the belt does not stretch or slip, calculate the angular acceleration a2 of the larger camshaft, which has a radius of r2 = 7.50 cm, during this time period. α₂ = rad/s²
A flywheel with a diameter of 1.81 m is rotating at an angular speed of 197 rev/min. (a) What constant angular acceleration (in revolutions per minute-squared) will increase the wheel's angular speed to 929 rev/min in 63.9 s? (b) How many revolutions does the wheel make during that 63.9 s?
A Google search revealed that the disc in a CD player spins at between 200 and 500 revolutions per minute (RPM) depending upon which area of the disc is being read or played. (a) How many radians per second are equivalent to 200 RPM? (b) By pressing and holding the fast-forward button, the CD player could quickly increase its speed from 200 RPM to 448 RPM in just 0.75 seconds. What was the angular acceleration (α) of the CD in units of radians per secondsquared as it sped up from 200 to 448 RPM?
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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 (revolutions per minute). How many revolutions has the disk made 10.0 s after it starts up? Do not enter units. Don't forget to convert rad/s to rev/s. A sketch of angular velocity versus time will help you solve this problem. Treat rev/s just as you would m/s.
A rotating disk is initially spinning at w = 6rev / s , slows down and stops in 19.7 . What is the magnitude of the disk's average angular acceleration? (in rev/s^ ^ 2)
An optical disk drive in your computer can spin a disk up to 10,000 rpm (about 1045 rad/s1045 rad/s). If a particular disk is spun at 734.1 rad/s734.1 rad/s while it is being read, and then is allowed to come to rest over 0.368 seconds0.368 seconds, what is the magnitude of the average angular acceleration of the disk? If the disk is 0.12 m0.12 m in diameter, what is the magnitude of the tangential acceleration of a point 1/71/7 of the way out from the center of the disk?
An ultracentrifuge accelerates from rest to 100,000 rpm in 2.30 min. (a) What is its angular acceleration in rad/s2? _________rad/s2 (b) What is the tangential acceleration of a point 10.7 cm from the axis of rotation?_________m/s2 (d) Express this radial acceleration as a multiple of g._________g
An optical disk drive in a computer can spin a disk at up to 10,000 rpm. If a particular disk is spun at 6170 rpm while it is being read, and then is allowed to come to rest over 0.368 s, what is the magnitude of the average angular acceleration of the disk?
Consider a drum of a clothing dryer that is turning at a rate of 1 revolution every second when you suddenly open the door of the dryer. You noticed that it took 17 seconds for the drum to completely stop. (a) What is the angular speed (in rad/s) at the precise moment when you suddenly open the door of the dryer? (b) Determine the deceleration (in rad/s2) of the drum. Assume constant deceleration. (Include the sign of the value in your answer.)
Most gasoline engines in today's automobiles are belt driven. This means that the crankshaft, a rod which rotates and drives the pistons, is timed to the camshaft, the mechanism which actuates the valves, by means of a belt. Starting from rest, assume it takes t = 0.0760 s for a crankshaft with a radius of r1 = 4.75 cm to reach 1350 rpm. If the belt does not stretch or slip, calculate the angular acceleration a2 of the larger camshaft, which has a radius of r2 = 9.50 cm, during this time period. a2 = rad/s?
In the figure, wheel A of radius ra = 13.3 cm is coupled by belt B to wheel Cof radius rc=20.4 cm. The angular speed of wheel A is increased from rest at a constant rate of 1.43 rad/s2. Find the time needed for wheel C to reach an angular speed of 58.1 rev/min, assuming the belt does not slip. (Hint: If the belt does not slip, the linear speeds at the two rims must be equal.) TA Number i Units

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