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Two balls A and B of mass m and 2m respectively are carried to height h at constant velocity but B rises twice as fast as A The work the gravitational force does on B is?
Wiki User
∙ 15y ago
Ug=mgh
assume- the work the gravitational force is the gravitational potential energy=Ug
hence, Ug doesn't depend on velocity/speed, therefore
Ug= (2m) gh
Wiki User
∙ 15y ago
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How much work is done when a book weighing 2.0 newtons is carried at constant velocity from one classroom to another classroom 26 meters away?
If the box ended up at the same height above the floor as it started, then no gravitational potential energy was added to the box in the form of work. It doesn't even matter if the box moved up or down on the way. Of course, work is done, and calories are expended. That's only because your body is not 100% efficient, and it takes work to move arm and leg muscles, walk, breathe, etc. But no work is done on the box as it moves horizontally.
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If a reaction is carried out in constant temperature and constant volume no work is done and heat exchanged with surroundings is equal to the internal energy.
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