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What is the first law of thermodynamics applied to closed and open system showing the meaning of the positive and negative sign of heat and work?
The first law of thermodynamics states that: "The internal energy of a system is a function of its state. Any increase in the internal energy of a system is equal to the sum of the heat supplied to the system and the work done on the system." In equations, this is stated as: DU = DQ + DW where DU is the INCREASE in internal energy DQ is the heat SUPPLIED DW is the work done ON the system So, if heat is lost by the system, it means that DQ is negative and if work is done by the system, it means that DW is negative. The best way to answer thermodynamics questions involving the first law is to think logically about what calculations should be made. If you do this, you will never make mistakes about signs.
Is it possible for exergy to be negative?
No, exergy is a measure of a system's potential to do work and cannot be negative. If the exergy value calculated for a system results in a negative number, it is likely due to errors in the calculations or assumptions made.
What is spontaneous process explain the role of free energy in these processes?
A spontaneous process is one that occurs naturally without requiring any external influence. Free energy is a measure of the potential energy available to do work in a system. For a process to be spontaneous, the free energy change must be negative, meaning that the system moves to a lower energy state, increasing its stability. Essentially, free energy serves as a driving force for spontaneous processes by determining whether a reaction or process will occur on its own.
What is work in chemistry?
In chemistry, work refers to the energy transferred when a force is applied to move an object over a distance. This can include processes like compressing a gas, stirring a solution, or changing the volume of a system. Work is typically used to describe the energy changes in chemical reactions or physical processes.
What is the sign of the work done by the frictional force?
The work done by the frictional force is negative because the force opposes the direction of motion. This means that the frictional force removes mechanical energy from the system by transforming it into heat, resulting in a decrease in the object's kinetic energy.
Can you explain if it is possible to do negative work in a physical system?
Yes, it is possible to do negative work in a physical system. Negative work occurs when the force applied to an object is in the opposite direction of its displacement. This results in the object losing energy rather than gaining it.
What is negative work and how does it impact the overall energy and motion of a system?
Negative work occurs when the force applied to an object is in the opposite direction of its motion. This results in a decrease in the object's energy and motion. In a system, negative work can lead to a reduction in the overall energy and motion of the system, potentially causing it to slow down or come to a stop.
How can the concept of negative work in physics affect the overall dynamics of a system?
Negative work in physics occurs when the force applied to an object is in the opposite direction of its motion. This can result in a decrease in the object's kinetic energy and a change in its velocity. In a system, negative work can lead to a decrease in the overall energy and momentum, affecting the system's dynamics by slowing down or changing the direction of its motion.
What is negative work in physics and how does it affect the overall energy of a system?
Negative work in physics occurs when the force applied to an object is in the opposite direction of its displacement. This results in a decrease in the object's energy, as work is done against its motion. In terms of the overall energy of a system, negative work reduces the total energy by converting it into other forms, such as heat or sound.
Is the work done on a system positive or negative?
The work done on a system is positive when energy is added to the system, and negative when energy is removed from the system.
Is the work done by the system is considered as positive or on the system is considered as positive?
Work done by the system is considered as PositiveWork done on the system is considered as Negative
How do you determine a work done is positive sign or negative sign?
If work is done on the system then it has a negative sign. If work is done by the system then it has a positive sign.
How does a negative feedback system work explain how negative feedback regulates the amount of thyroxine in the blood?
When the amount of a particular hormone in the blood is reaches a certain level, the endocrine system sends signals to stop the release of that hormone. "Pearson Education Inc."
Is the work done on a system negative in the given scenario?
In the given scenario, if the force applied to the system is opposite to the direction of the displacement, then the work done on the system is negative.
What are the consequences of negative work done on a system?
The consequences of negative work done on a system can include a decrease in the system's energy, a decrease in the system's temperature, and a change in the system's state or properties. Negative work typically represents work done by the system on its surroundings, resulting in a loss of energy within the system. This can lead to a decrease in the system's overall performance or efficiency.
Can work done be negative in a physical system?
Yes, work done can be negative in a physical system when the force applied is in the opposite direction of the displacement.
What is the work done by the system according to the sign convention?
The work done by the system is positive if the system does work on its surroundings, and negative if work is done on the system by the surroundings.
