Don't understand phrasing of Question

  • Thread starter Thread starter bbb0777
  • Start date Start date
AI Thread Summary
The discussion revolves around the interpretation of a physics question regarding the rotation of a helical spring around a vertical axis. The main confusion lies in whether the spring is laid flat on the ground while being spun or if it remains upright with the top coil being rotated. Clarification is sought on the mechanics of the rotation and the implications of adding mass to the spring's free end. The reference image is intended to illustrate the concept of moment of inertia, but its relevance is questioned. Overall, the inquiry highlights the challenges non-native speakers face in understanding complex physics terminology and concepts.
bbb0777
Messages
3
Reaction score
0
Sorry if this is the wrong place to ask

A helical spring is rotated about one of its ends around a vertical axis. Investigate the expansion of the spring with and without an additional mass attached to its free end.

Does that make sense to you?

Not my question - a non-native-speaker friend asked me to explain the meaning of a few physics questions. I don't really understand the italicized part of this one though...
 
Last edited:
Physics news on Phys.org
Basically, you lay the helical spring flat on the ground and spin it about one of its ends.
 
So - a cylindrical spring is sitting upright on the ground. You grab the top most edge, then start moving your arm in a circular motion. Is that it? Or, is the cylindrical spring sitting in the same manner, and you just grab the top most coil then start rotating the spring?
 
Last edited:
Like this:

http://images.absoluteastronomy.com/images/encyclopediaimages/m/mo/moment_of_inertia_rod_end.png

where the rod is the spring
 
Last edited by a moderator:
Nor do I understand that png. Perhaps I'm just daft about this.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Moment of inertia of a cuboid parallel to one of its faces (repost with diagram)
Replies
25
Views
2K
Effect of a polarizer/analyzer on partially polarized light
Replies
25
Views
3K
Incandescent Bulb - suitable approximation for voltage-current curve
Replies
2
Views
944
Understanding the generic nature of linearity in Physics
Replies
2
Views
989
Solve questions on oscillations and kinetic energy
Replies
2
Views
2K
How to Apply Derivatives in Physics Problems?
Replies
9
Views
1K
Calculate tilt angle of a bar lifted via two ropes on fixed points
Replies
7
Views
3K
Horizontal impulse on a ball at rest on a plane (with friction)
Replies
14
Views
3K
The Effect of Increasing the Size of a Solid on Its Entropy
Replies
1
Views
1K
Understanding Uncertainties: Explaining Common Questions and Misconceptions
Replies
7
Views
3K

Hot Threads

Recent Insights

Back
Top