3. When the machine in the previous question is turned off, the motor provides some resistance which slows the grindstone to a stop in about 6.0s. A student calculates that, during this time, the grindstone must have completed about 9 rotations. Their calculations were as follows: (90 rot/min) (1min) (6.0 s) = 9.0 rot. 60 What is wrong with the student's work, and what is the correct answer?

3. When the machine in the previous question is turned off, the motor provides some resistance which slows the grindstone to a stop in about 6.0s. A student calculates that, during this time, the grindstone must have completed about 9 rotations. Their calculations were as follows: (90 rot/min) (1min) (6.0 s) = 9.0 rot. 60 What is wrong with the student's work, and what is the correct answer?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter7: Rotational Motion And Gravitation

Section: Chapter Questions

Problem 52AP: The dung beetle is known as one of the strongest animals for its size, often forming balls of dung...

See similar textbooks

Similar questions

An automobile with 0.260 m radius tires travels 80,000 km before wearing them out. How many revolutions do the tires make, neglecting any backing up and any change in radius due to wear?
The dung beetle is known as one of the strongest animals for its size, often forming balls of dung up to 10 times their own mass and rolling them to locations where they can be buried and stored as food. A typical dung ball formed by the species K. nigroaeneus has a radius of 2.00 cm and is rolled by the beetle at 6.25 cm/s. (a) What is the rolling balls angular speed? (b) How many full rotations are required if the beetle rolls the ball a distance of 1.00 m?
An engine fan initially rotates at 450 rpm and is turned off for 20.0 seconds, during which time it rotates at 100 revolutions.a) How fast is the steering wheel turning when it turns again?b) In how much time after the first lapse would it have stopped completely?
A wheel that initially rotates 4.7 rad/sec comes to rest after 5 seconds, How many revolutions does the wheel made before it stop? Use the abbreviation rev for revolutions. ..Use 9.81 m/s2 for the acceleration due to gravity.⋅⋅ Round off answers to 4 decimal places.
A circular wheel goes from rest to full speed of 31 rev/min in 1/8 of a complete rotation. 1. How long does the wheel take to reach full speed?
ENGINEERING QUESTION- SOLVE FROM SCRATCH!An engine fan initially rotates at 450 rpm and is turned off for 20.0 seconds, during which time it rotates at 100 revolutions.a) How fast is the steering wheel turning when it turns again?b) In how much time after the first lapse would it have stopped completely?
Starting from rest, a centrifuge can reach its operational speed of 4300 rpm in 10.0 s. How many revolutions does it make during this time? Revolutions =
6) A giant Ferris wheel is spinning at 70 rad/s. It is switched off and accelerates at the rate of-10 rad/s. How many full revolutions will it complete in 3.0 s?
4. When a fan is turned off, its angular speed decreases from 168 rpm to 64.0 rpm in 6.08 s. a) What is the angular acceleration of the fan? b) How fast the edges of the blades are moving (in m/s) at time 6.08 s, if they are 86.0 cm long?
A disk rotating at 30rad/s slows to 20rad/s while turning through 60 revolutions. How long does this take?
Semi-trailer trucks have an odometer on one hub of a trailer wheel. The hub is weighted so that it does not rotate, but it contains gears to count the number of wheel revolutions-it then calculates the distance traveled. If the wheel has a 1.09 m diameter and goes through 230,000 rotations, how many kilometers should the odometer read? (Enter a number.) km t
FIGURE 2. Q;B = 5 in; BC = 15 in.; Q.c = 21 in.; Q:Q4 = 26 in.; CBE = 27 in. sketch represents a crank and rocker mechanism used in a certain type of wool- combing machinery. Q¿B is the driving crank, rotating clockwise at a uniform speed of 120 rpm. For the position shown, Q,B horizontal and making an angle of 30 degree with the line of centers, find the linear acceleration of the The connection rod BC.