0
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?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What is the difference between negative and positive feedback in human?
we grow up with the learning of the fact that there is a difference between Positive and Negative feedback. it is obvious that negative is bad because of the the latin root "neg" meaning to feel sorrow. while positive is good because it uses the greek root "pos" meaning to be in a place of high power
Is water defected by a non uniform electrostatic field?
Yes, water can be deflected by a non-uniform electrostatic field. Water molecules are polar, meaning they have a positive charge on one end and a negative charge on the other. When a non-uniform electrostatic field is applied, the positive and negative ends of the water molecules will experience different forces, causing the water to be deflected.
Is an anion postive?
negative cations are positive. remember the one with plus sign (+)n it meaning "t" is positive.
Do positive and neutral attract each other?
both positive and negative objects attract to neutral object so yes positive and neutral will attract each other.
What is the meaning of the DC electrical terms Positive Neutral and Negative?
DC means "direct current." Normally this is provided by a battery or transformer. Positive - The positive contact where current flows into a circuit. Neutral - The ground wire in case something happens like a surge. Negative - The negative contact where current leaves.
Is dismal a positive connotation or a negative connotation?
It is a negative word. Meaning negative, dreary, sad, etc.
Is fearless a negative word or a positive word?
fearless is positive, meaning brave, courageous.
Why multiplication of negative numbers equals positive?
When you multiply any number by a negative number you reverse its sign. So positive numbers become negative, and negative numbers become positive. That is the meaning of negative multiplication; it is reversal. This is similar to the way that adding a negative number has the same effect as subtracting a positive number. Negative is the opposite of positive.
What the meaning of opposite in maths for kids to understand?
opposites somehow like a positive number is the opposite of a negative and a negative number is the opposite of a positive
What are not integers?
A decimal or fraction is not an integer. An integer is a positive or negative whole number. Meaning that a positive or negative fraction or decimal is not an integer.yes by what the paper says
Does the adverb too carry positive meaning?
'too' (adverb) can have a positive, a neutral or a negative meaning.# Positive: He's too handsome for words! = He is so handsome, I can't describe how handsome he is! # neutral: Are you coming too? # negative: This soup is too hot.
What number goes into 750?
The following are factors of 750, meaning they go into 750 a certain number of times. To find out how many times the number goes into 750, find the corresponding number on the other side of the array. For instance to see how many times 5 goes into 750, find the 4th-last number in the array (150):1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 125, 150, 250, 375, 750
What are the types of buoyancy?
There are only three types of buoyancy. Positive, Neutral and Negative. Positive rises, neutral is in between meaning its in the center and negative sinks. Your welcome
What does polar mean in scientific meaning?
ll im not sure of the scintific meaning but i know polar means that a molecule on only slightly more postivie than negative or vise versa. like water is only slightly more positive than negative because hrdrogen is positive and oxygen is negative for a ratio of negative to positive making it 2:1
What is the difference between negative and positive feedback in human?
we grow up with the learning of the fact that there is a difference between Positive and Negative feedback. it is obvious that negative is bad because of the the latin root "neg" meaning to feel sorrow. while positive is good because it uses the greek root "pos" meaning to be in a place of high power
Is water defected by a non uniform electrostatic field?
Yes, water can be deflected by a non-uniform electrostatic field. Water molecules are polar, meaning they have a positive charge on one end and a negative charge on the other. When a non-uniform electrostatic field is applied, the positive and negative ends of the water molecules will experience different forces, causing the water to be deflected.
What is the difference between anode led and cathode led?
A: A LED is a diode and like all diode they have an [anode] meaning positive terminal and a [cathode] negative terminal. Therefore the proper potential must be applied for it to behave like an LED.
