Ch 14: Angular MomentumWorksheetSee all chapters
All Chapters
Ch 01: Units & Vectors
Ch 02: 1D Motion (Kinematics)
Ch 03: 2D Motion (Projectile Motion)
Ch 04: Intro to Forces (Dynamics)
Ch 05: Friction, Inclines, Systems
Ch 06: Centripetal Forces & Gravitation
Ch 07: Work & Energy
Ch 08: Conservation of Energy
Ch 09: Momentum & Impulse
Ch 10: Rotational Kinematics
Ch 11: Rotational Inertia & Energy
Ch 12: Torque & Rotational Dynamics
Ch 13: Rotational Equilibrium
Ch 14: Angular Momentum
Ch 15: Periodic Motion (NEW)
Ch 15: Periodic Motion (Oscillations)
Ch 16: Waves & Sound
Ch 17: Fluid Mechanics
Ch 18: Heat and Temperature
Ch 19: Kinetic Theory of Ideal Gasses
Ch 20: The First Law of Thermodynamics
Ch 21: The Second Law of Thermodynamics
Ch 22: Electric Force & Field; Gauss' Law
Ch 23: Electric Potential
Ch 24: Capacitors & Dielectrics
Ch 25: Resistors & DC Circuits
Ch 26: Magnetic Fields and Forces
Ch 27: Sources of Magnetic Field
Ch 28: Induction and Inductance
Ch 29: Alternating Current
Ch 30: Electromagnetic Waves
Ch 31: Geometric Optics
Ch 32: Wave Optics
Ch 34: Special Relativity
Ch 35: Particle-Wave Duality
Ch 36: Atomic Structure
Ch 37: Nuclear Physics
Ch 38: Quantum Mechanics

Solution: A small puck moves in a circle on a frictionless air table. The circular motion is enforced by a person holding a string tied to the puck and going through a tiny hole in the middle of the table. Init

Problem

A small puck moves in a circle on a frictionless air table. The circular motion is enforced by a person holding a string tied to the puck and going through a tiny hole in the middle of the table. Initially, the puck moves in a circle of radius R at speed v. But later the string is pulled down through the hole forcing the puck to move in a smaller circle of radius 1/2 R. How much work did the person do while moving the puck from R to 1/2 R?

1. W =3/4 mv2

2. W =3/2 mv2

3. W = mv2

4. W =5/2 mv2

5. W =2/3 mv2

6. W =1/3 mv2

7. W =4/3 mv2

8. W = 2mv2

9. W =1/4 mv2

10. W =1/2 mv2