How Much Energy is Spent Holding 1kg for an Hour?

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In summary, the theoretical energy spent when holding 1 kilogram at one meter for an hour is dependent on factors such as muscle tone, circulation, and metabolism rather than just the physics of weight and gravity. This is why a helicopter expends energy to hold a weight, while a helium balloon does not.
  • #1
jc.int
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hello,
If I hold 1kilogram at one meter of the groud during an hour, what would be the theoretical energy I am spending (in joules for example)?

Thank you,
Jaimie
 
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  • #2
You're not doing any work because the displacement of the object is 0.

However, your muscles, as a biological system, are inefficient. To just bear a load without moving it, they must alternately contract and relax rapidly. As a result, your body expends chemical energy and you do end up feeling tired.
 
  • #3
cepheid said:
You're not doing any work because the displacement of the object is 0.

However, your muscles, as a biological system, are inefficient. To just bear a load without moving it, they must alternately contract and relax rapidly. As a result, your body expends chemical energy and you do end up feeling tired.

Indeed. And as a result, the amount of energy expended depends more on your muscle tone, circulation, metabolism, etc. then on simple physics of the weight and gravity. Place the same kilogram on a solid table for an hour and it becomes obvious that no energy is being expended (the table does not run down its batteries/use up its fuel, etc.)
 
  • #4
I agree with you but when a helicopter holds a weight it is using energy to compense the gravity force, isn't it?
 
  • #5
Yes, because once again, it is inefficient. A helium balloon can hold a weight as well, and it would require no energy input to do so.
 

What is the definition of "energy spent on holding a kg"?

The energy spent on holding a kg refers to the amount of force or work required to hold a 1 kg object in place against the force of gravity.

How is the energy spent on holding a kg calculated?

The energy spent on holding a kg can be calculated by multiplying the mass of the object (in kg) by the acceleration due to gravity (9.8 m/s²) and the height at which the object is held (in meters).

What is the unit of measurement for energy spent on holding a kg?

The unit of measurement for energy spent on holding a kg is joules (J). This is the same unit used to measure work and energy in the metric system.

Does the energy spent on holding a kg vary on different planets?

Yes, the energy spent on holding a kg will vary on different planets due to the different acceleration due to gravity on each planet. For example, on the moon the energy spent on holding a kg would be 1/6 of what it is on Earth.

How does the energy spent on holding a kg affect the human body?

The energy spent on holding a kg can have an impact on the human body, especially if the object is held for a prolonged period of time. It can lead to muscle fatigue and strain, resulting in discomfort or injury.

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