Find Min Torque to Lift 15kg Bundle of Shingles

In summary, to lift a 15-kg bundle of shingles from the ground to the roof with a 1.5-m/s^2 upward acceleration, the motor must be able to provide a minimum torque of approximately 1.7 Nm. The lightness of the pulley and its radius of 0.11m are important factors in determining the minimum torque required.
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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



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  • #2
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?
 

Related to Find Min Torque to Lift 15kg Bundle of Shingles

1. What is the minimum torque required to lift a 15kg bundle of shingles?

The minimum torque required to lift a 15kg bundle of shingles depends on several factors, including the distance from the pivot point to the center of mass of the bundle, the weight distribution of the shingles, and the strength and design of the lifting mechanism. A thorough analysis and calculation is needed to determine the exact minimum torque required.

2. How can I determine the center of mass of the shingles bundle?

The center of mass of a shingles bundle can be determined by finding the average weight distribution of the shingles and calculating the center point based on that. Alternatively, a physical experiment can be conducted by balancing the bundle on a pivot point and marking the point where it balances.

3. What is the best way to lift a 15kg bundle of shingles?

The best way to lift a 15kg bundle of shingles is to use a lifting mechanism specifically designed for this purpose. This can include a hoist, pulley system, or other lifting device. It is important to follow proper lifting techniques and use the appropriate safety equipment to avoid injury.

4. Can the minimum torque required to lift the shingles bundle change?

Yes, the minimum torque required to lift a 15kg bundle of shingles can change depending on the weight distribution of the shingles, the angle at which they are being lifted, and any external forces acting on the bundle. It is important to recalculate the minimum torque required if any of these factors change.

5. Are there any safety considerations when lifting a shingles bundle?

Yes, there are several safety considerations when lifting a shingles bundle. Always make sure to use appropriate safety equipment, such as gloves and safety glasses, and follow proper lifting techniques. Additionally, it is important to have a secure and stable base for the lifting mechanism and to avoid overloading it beyond its capacity.

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