Torque crank and bucket question

  • Thread starter Thread starter dnt
  • Start date Start date
  • Tags Tags
    Crank Torque
AI Thread Summary
To determine the minimum force required to raise a 70 kg bucket of water using a crank and cylinder system, the concept of torque is essential. The torque exerted by the bucket's weight must be balanced by the torque applied through the crank handle. The challenge arises from understanding which radius value to use in the torque equation due to a lack of a clear diagram. A suggested resource provides a visual aid to clarify the problem setup. This discussion emphasizes the importance of torque equilibrium in solving the problem effectively.
dnt
Messages
238
Reaction score
0

Homework Statement



A bucket filled with water has a mass of 70 kg and is attached to a rope that is wound around a 0.035 m radius cylinder. A crank with a turning radius of 0.35 m is attached to the end of the cylinder. What minimum force directed perpendicularly to the crank handle is required to raise the bucket?

Homework Equations



obviously torque = F * r * sin

The Attempt at a Solution



my problem here is i cannot accurately understand the diagram (there is no picture that goes along with it). i cannot tell which r value to use. if someone could clarify that i would appreciate it.
 
Physics news on Phys.org
This is really an equilibrium problem: the bucket (via the rope) exerts a tension on the cylinder tending to make it turn one way; you (via the crank handle) have to exert a torque in the opposite direction to balance it out.

I was able to dig up a diagram that will help you visualize what's going on. Go to http://www.physics.utah.edu/~woolf/2010_rich/rev4.pdf and look at the diagram that accompanies problem #24.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

What Torque Is Required to Raise a Water Bucket from a Well?
Replies
5
Views
2K
Mechanical Advantage in a crank system
Replies
26
Views
8K
What is the rotational velocity of the crank?
Replies
3
Views
5K
How Is Angular Speed Calculated in a Falling Bucket Physics Problem?
Replies
3
Views
3K
I have a diffcult question about torque -- me
Replies
10
Views
2K
Angular acceleration of a bucket attatched to a solid cylinder
Replies
2
Views
9K
How Does Torque Affect the Motion of a Disc Pulled Across a Table?
Replies
3
Views
2K
Find the equilibrium position of the winch
Replies
1
Views
2K
Calculating Torque and Force for a Mechanic's Task
Replies
1
Views
2K
How Do You Calculate Torque in Mechanical Situations?
Replies
1
Views
3K

Hot Threads

Recent Insights

Back
Top