• About
  • Video
  • Radio
  • The Book
  • Puzzle forum
    • **PROPOSE A PUZZLE**
    • Geometry
    • Mathematics
    • Statics
    • Dynamics & Collisions
    • Circular motion
    • Simple harmonic motion
    • Mad inventions & perpetual motion
    • Kinematics
    • Electricity
    • Gravity
    • Optics
    • Heat
    • Buoyancy & hydrostatics
    • Estimation
  • Bonus Material
    • Bonus Pulley Questions
    • Bonus Statics Questions
    • Bonus Scaling Questions
    • Bonus Probability Questions
  • Hall of fame
  • ERRATA
Login/ Register
  • Home
  • Bonus Pulley Questions
  • Qu121 - Two equal weights
PerplexingProblemsBRINGING MATHS & PHYSICS TO LIFE
  • About
  • Video
  • Radio
  • The Book
  • Puzzle forum
    • **PROPOSE A PUZZLE**
    • Geometry
    • Mathematics
    • Statics
    • Dynamics & Collisions
    • Circular motion
    • Simple harmonic motion
    • Mad inventions & perpetual motion
    • Kinematics
    • Electricity
    • Gravity
    • Optics
    • Heat
    • Buoyancy & hydrostatics
    • Estimation
  • Bonus Material
    • Bonus Pulley Questions
    • Bonus Statics Questions
    • Bonus Scaling Questions
    • Bonus Probability Questions
  • Hall of fame
  • ERRATA
Posted March 26, 2015 by in Bonus Pulley Questions 1453

Qu121 - Two equal weights

A pulley arrangement consisting of a fixed pulley A, a fixed double pulley B, and a free pulley C is attached to two equal masses D and E as shown in the diagram. The pulleys are light and frictionless, and the ropes are light and inextensible. The pulleys are very small in comparison to their separation. The system is initially held in a position shown. The angle rope CA makes to vertical is θ, and the angle ropes CB make to the vertical is φ. The system is released. What is the angle θ when the system is in equilibrium?

 

Share this post

About author

Related posts

Qu122 - Two unequal weights Bonus Pulley Questions

Qu122 - Two unequal weights

This variation on Qu121 allows an explicit solution to be calculated. Where the previous puzzle might be regarded as slightly tricky, this is straightforward in the sense that there are no unexpected tricks---it is purely a question of carefully applying methods in statics. A pulley...

Qu119 - Window cleaner Bonus Pulley Questions

Qu119 - Window cleaner

A window cleaner works in a light suspended cradle attached to a roof structure by a rope. Three pulley configurations A, B and C are available. Assuming the man to be strong, determine for each configuration which of the following is true when the man pulls on the free end of the rope as...

Qu118 - Biggest pull Bonus Pulley Questions

Qu118 - Biggest pull

I really like this question. Many people struggle with even the easy part, despite thinking they are familiar with how pulleys work. You should try the harder variant to get a more complete understanding of how to use control volume analysis. A man has one single pulley, and one double pulley...

Leave a comment Cancel reply

Log In
Register

Search Forums

Members

Newest | Active
  • Profile picture of Jowan28
    Jowan28
    active 2 years, 2 months ago
  • Profile picture of rafiulislam
    rafiulislam
    active 2 years, 3 months ago
  • Profile picture of Coboy
    Coboy
    active 2 years, 3 months ago
  • Profile picture of sportszon
    sportszon
    active 2 years, 4 months ago
  • Profile picture of Lim seok jun
    Lim seok jun
    active 2 years, 5 months ago

Forum Statistics

Registered Users
238
Forums
15
Topics
38,291
Replies
273
Topic Tags
604

Topics Update

  • Most popular topics
  • Topics with no replies