Finding q to then raise an object, hoping someone can check this work

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In summary, the conversation is about calculating how high a horse could raise a 217kg weight in 2.5 minutes, based on its ability to heat 11.6kg of ice water in 2.5 hours. The calculations and logic for the solution are discussed, and there is a mention of potential complexities related to reversibility.
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speny83
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I think I've got this but not 100% sure.

if a horse can heat 11.6kg ice water T=273k to 355K in 2.5 hours how high could it raise a 217kg weight in 2.5 min?

heres what I've done

qp=mcp,sdt=(1.16E4 g)(4.18 J K-1g-1)(82K)=3.976E6 J

(3.976E6 J/2.5hr)(1hr/60min)(2.5min)=6.627E4 J

h=w/mg=6.627E4 J/((217 kg)(9.81m s-2))=31.1m

does this seem legit? we working with all this rev/irr-rev work and transfer and I am getting really mixed up by simple stuff but if p=const then it would be irreversible right?


any suggestions would be great if I am way off track

Thnaks
 
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  • #2
Looks OK to me (I haven't checked the numbers, just skimmed the logic), but your comment about reversibility/irreversibility makes me wonder if there is not some context to the question which makes it more complicated. But if treated literally as posted - its OK.
 

FAQ: Finding q to then raise an object, hoping someone can check this work

What is the process for finding q to then raise an object?

The process for finding q to then raise an object is to first determine the weight of the object in kilograms. Then, multiply the weight by the acceleration due to gravity (9.8 m/s^2) and the height at which the object needs to be raised. Finally, divide this value by the efficiency of the lifting mechanism being used.

How do you calculate the weight of an object in kilograms?

To calculate the weight of an object in kilograms, you can use the formula W = m x g, where W is weight in Newtons, m is mass in kilograms, and g is the acceleration due to gravity (9.8 m/s^2). You can also convert the weight from pounds to kilograms by dividing the weight in pounds by 2.20462.

What is the acceleration due to gravity?

The acceleration due to gravity is a constant value of 9.8 meters per second squared (m/s^2). This means that for every second an object falls, its speed increases by 9.8 meters per second. This value is used in many physics equations, including calculating the force of gravity on an object.

How do you determine the efficiency of a lifting mechanism?

The efficiency of a lifting mechanism can be determined by dividing the work output (the force applied to the object multiplied by the distance it is raised) by the work input (the force applied to the mechanism multiplied by the distance the force is applied). This value is usually expressed as a percentage and represents how much of the input work is converted into output work.

Can this process be used for any object?

Yes, this process can be used for any object as long as the weight, height, and efficiency values are known. It is important to note that this process assumes the object is being raised vertically and there are no external forces acting on the object.

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