Find Min Torque to Lift 15kg Bundle of Shingles

  • Thread starter Thread starter insidelace
  • Start date Start date
  • Tags Tags
    Lift Torque
AI Thread Summary
To determine the minimum torque required to lift a 15-kg bundle of shingles with an upward acceleration of 1.5 m/s², a free body diagram should be used to calculate the necessary force. The lightness of the pulley indicates that it does not contribute significantly to the overall weight, simplifying calculations. The radius of the pulley, at 0.11 m, is crucial as it directly affects the torque calculation using the formula τ = F * r, where τ is torque, F is force, and r is the radius. The minimum torque must be expressed with two significant figures and appropriate units. Accurate calculations are essential for selecting a suitable motor for this lifting task.
insidelace
Messages
1
Reaction score
0

Homework Statement


You wish to buy a motor that will be used to lift a 15-kg bundle of shingles from the ground to the roof of a house. The shingles are to have a 1.5-m/s^2 upward acceleration at the start of the lift. The very light pulley on the motor has a radius of 0.11m. Determine the minimum torque that the motor must be able to provide. Express your answer to two significant figures and include the appropriate units.


Homework Equations


τ=±Fdsinθ



The Attempt at a Solution



?
 
Physics news on Phys.org
Welcome to PF;
Start with a free body diagram to work out the minimum force to get the required result.

Why does it take the trouble to tell you the pulley is light?
Why is the pulley radius important?
 
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

Torque to lift object by cable on a drum accelerating
Replies
8
Views
4K
What is the torque exerted by the flywheel on the machine?
Replies
5
Views
4K
Calculating Horse Power: How Many Bundles of Shingles Can a Horse Hoist?
Replies
2
Views
6K
Finding torque to life object at a certain acceleration
Replies
2
Views
3K
Torque calculations: Rotating vertical shaft
Replies
5
Views
5K
Calculating Time for Mass to Travel Distance on a Pulley
Replies
1
Views
11K
Find torque required to lift a mass
Replies
7
Views
12K
How Do You Calculate the Acceleration of a Bucket on a Pulley System?
Replies
3
Views
8K
Stepper Motor Torque Characteristic Measurement
Replies
4
Views
13K
Torque on a Pulley Homework: Find Speed & Average Torque
Replies
17
Views
8K

Hot Threads

Recent Insights

Back
Top