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Angular Momentum - Engineering Physics - Quiz Slides, Exercises of Engineering Physics

University of AllahabadEngineering Physics

This slides are class quiz. This quiz was very interactive as teacher explained reasons with answer latter. Things you can see in these lecture slides are: Angular Momentum, String, Direction, Spinning Bicycle, Axle Aligned, Vertically Upward, Rotational Dynamics, Inertia, Suspended Mass, Acceleration, String, Angular Speed

Typology: Exercises

2013/2014

Uploaded on 01/31/2014

samiksha
samiksha 🇮🇳

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102 documents

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Clicker Quiz
When your instructor is holding a spinning bicycle wheel by a
cord with its axle aligned in the x-direction and the y-direction is
defined as vertically upward, in which direction is the change in
angular momentum about the point where the string is
attached?
x
y
z
dLc/dt
1. +y
2. - y
3. +z
4. - z
docsity.com
pf3
pf4
pf5

Partial preview of the text

Download Angular Momentum - Engineering Physics - Quiz Slides and more Exercises Engineering Physics in PDF only on Docsity!

Clicker Quiz

When your instructor is holding a spinning bicycle wheel by a cord with its axle aligned in the x-direction and the y-direction is defined as vertically upward, in which direction is the change in angular momentum about the point where the string is attached? x y z dLc/dt

  1. +y
  2. - y
  3. +z
  4. - z docsity.com

Lrot,f = Lrot,i + (^) net∆t A wheel of radius R and moment of inertia I is mounted on a low-friction axle. A string is wrapped around the edge, and you pull on it with a force F. At a certain time the angular speed is ω i . (a) After a time interval ∆t, what is the angular speed ω f ?

Clicker Quiz

  1. ωf = ωi + F R∆t
  2. ωf = ωi − F R∆t
  3. ωf = ωi + F R/∆t
  4. ωf = ωi − F R∆t/I
  5. ωf = ωi + F R∆t/I docsity.com

11.8 Rotational Dynamics Clicker Quiz

A cord is wrapped around a flywheel of inertia I = 1/2 mR 2 and radius R. A mass m is suspended by the cord. The system is re- leased from rest and the suspended mass falls. What is the acceleration of the suspended mass m?

  1. g/
  2. 2g/
  3. 2 g
  4. g
  5. 3g/ docsity.com

11.8 Rotational Dynamics Clicker Quiz

A cord is wrapped around a flywheel of inertia I = 1/2 mR 2 and radius R. A mass m is suspended by the cord. The system is re- leased from rest and the suspended mass falls.

How far will the mass fall in ∆t seconds?

  1. ∆y = 4 g 9 ∆t 2
  2. ∆y = g 3 ∆t 2
  3. ∆y = 2 g 3 ∆t 2
  4. ∆y = g 2 ∆t 2
  5. ∆y = 2 g 9 ∆t 2 docsity.com

String is wrapped around an object of mass M and moment of inertia I. With your hand you pull the string straight up with some constant force F such that the center of the object does not move up or down, but the object spins faster and faster. When your hand is a height y 0 above the floor, the object has an angular speed ω i

. When your hand has risen to a height y above the floor, what is the angular speed ω of the object?

  1. ωf = M g(y − y 0 ) I
  • ω 2 i
  1. ωf = M g(y + y 0 ) I
  • ω 2 i
  1. ωf = M g y I
  • ω 2 i
  1. ωf = M g(y − y 0 ) I − ω 2 i
  2. ωf = M g(y − y 0 ) I
  • ωi

Clicker Quiz

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