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The answer to your question. Is in your question. He is doing heavy work and therefore is spending more engery.
It depends on how heavy the package is, how far it is being lifted, and who/what is doing the lifting.
Kinetic energy
The difference between the use of fission and fusion as an energy source is that in fusion reaction, 2 or more light atomic nuclei fuses to form single heavier nucleus while in fission reaction, heavy atomic nucleus is usually splited into smaller nuclei, other particles and radiation.
The energy in a nuclear reaction comes from the release of some of the residual binding energy that holds the nucleus together. When you split heavy isotopes, such as uranium-235, or when you fuse light isotopes, such as hydrogen-2, the total binding energy required is reduced by a small amount. This difference is released as heat and radiation.
They need less energy because they don't do as much as when they were younger. Unless they are doing heavy work then they do require more energy
As people get older, their overall energy needs may decrease due to a reduction in muscle mass and physical activity. Metabolic rate tends to decrease with age, meaning that fewer calories are required for daily functioning. However, individual energy needs vary based on factors such as activity level, muscle mass, and overall health.
The answer to your question. Is in your question. He is doing heavy work and therefore is spending more engery.
It depends on how heavy the package is, how far it is being lifted, and who/what is doing the lifting.
Kinetic energy
Heavy water contains heavy hydrogen, i.e., deuterium. Once nuclear fusion is improved, it might become a viable energy source.
A heavy arrow will have more kinetic energy when shot from a compound bow compared to a light arrow. Kinetic energy is determined by both the mass and velocity of an object. Although a heavy arrow may have a lower initial velocity, its greater mass compensates and results in higher kinetic energy than a lighter arrow.
There are special heavy duty office chairs that are suited for overweight peoples.. http://www.officechairsunlimited.com/heavy-duty-office-chairs.html
4 bolt mains is the only difference I am aware of.
Heavy rain affects a persons life because it is dangerous to drive during this time. Heavy rain will also cancel outside events.
kinetic energy
The naswer will depend on what you mean by "doing" top heavy fractions.