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Explain the working of a refrigerator as a heat pump.

Posted by Kunal Gupta 6 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

It works on principle which is reverse of a heat engine.
In refrigerators we have 2 bodies lower temperature (cold) body which is freezer and higher temperature (hot) body which is surroundings.
It takes heat from the cold reservoir and then some work is done on the refrigerator and then the amount of heat is transferred to heat reservoir.
Let Q₂ be the takes from the cold reservoir, W is the work done on the system and then releases Q₁ amount of heat to the hot reservoir.
Mathematically Q₂+ W=Q₁

Heat Pump: In a heat pump heat is supplied into system when the surroundings are cold.

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Nct examination paper 2017 fully solve

Posted by Hardyal Singh Hardyal Singh 6 years, 11 months ago

CBSE > Class 11 > English Core

0 answers

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Why CV is less than CP

Posted by Shakti Rathore 6 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

Cp (specific heat at constant pressure)
Cv (specific heat at constant volume)
When a gas is heated at constant volume,no external work is done and so the heat supplied is consumed only in increasing the internal energy of a gas.
But if the gas is heated at constant pressure , the gas expands against the external pressure so does some external work.In this case the supplied heat is used up in increasing the internal energy of the gas and in doing some external work .
Since the internal energy is depends only on temperature,for the same rise of temperature the internal energy of a mass of a gas will increase by the same amount whether the pressure or volume remains constant.But since external work is additionally done for constant pressure than at constant volume to produce the same rise in temperature of the gas. Above is the reason for Cp is greater than Cv.

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Relation between angular veocity and linear velocity?

Posted by Arun Kamboj 6 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Avantika Tayal 6 years, 11 months ago

w=r×v

2Thank You

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What is amphoteric substance

Posted by Surjeet Choudhury 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogita Ingle 6 years, 11 months ago

Substances which can act both as acids, as well as bases, are called amphiprotic or amphoteric substances. When we look just at Bronsted-Lowry acids and bases we can also talk about amphiprotic substances which are a special type of amphoteric substances.

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Ayushi Ayushi 6 years, 11 months ago

In chemistry, an amphoteric compound is a molecule or ion that can react both as an acid and as a base. Many metals (such as copper, zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. ...

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Meera chapter traslation

Posted by Moksh Dewangan 6 years, 11 months ago

CBSE > Class 11 > हिंदी कोर

1 answers

Suhani Sharma 6 years, 11 months ago

Find out from net

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why zeroth law is named so?????

Posted by Yakshi Baliyan 6 years, 11 months ago

CBSE > Class 11 > Physics

4 answers

Ankit Singh 6 years, 11 months ago

It is called the "zeroth" law because it came to light after the first and second laws of thermodynamics had already been established and named, but was considered more fundamental and thus was given a lower number — zero. Hope this will help u yakshi

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Yogita Ingle 6 years, 11 months ago

The zeroth law is so named because it logically precedes the first and second laws of thermodynamics.
The zeroth law of thermodynamics is the basis for temperature measurement of a body or object. It defines the exchange of heat as well as defines the temperature. The law deals with the concepts used for designing the thermometer.

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Lavanya ❤️? 6 years, 11 months ago

It is called the zeroth law because it came to light after the first and second laws of thermodynamics

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Ayushi Ayushi 6 years, 11 months ago

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Journalise : sold goods to vijay Rs. 20000on 10% trade discount and 25%cash discount . Half amount was paid on the spot

Posted by Manpreet Kaur 6 years, 11 months ago

CBSE > Class 11 > Accountancy

2 answers

Manpreet Kaur 6 years, 11 months ago

Thanks reet

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Reet Sran 6 years, 11 months ago

cash a/c dr. 6750 dis. all.a/c dr. 2250 vijay dr. 9000 to sales a/c 18000

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Journalise : vicky who owned Rs. 1000 has become insolvent. He pays 50% in a rupee in his full settlement of his account.

Posted by Manpreet Kaur 6 years, 11 months ago

CBSE > Class 11 > Accountancy

2 answers

Manpreet Kaur 6 years, 11 months ago

Plz answer my other journal question

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Reet Sran 6 years, 11 months ago

Cash a/c dr. 500 Bad debts a/c dr.500 To Vicky. 1000

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Prepare the purchase book : 2017,April 3: purchase from Aishwarya and co. 15 shirts@Rs. 75 each 10 trousers @Rs. 150 each Less :10% trade discount, CGST 6%,SGST 6% April 23: Purchase from urmil and co. 200 shirts @Rs 350 each 20 overcoat3overcoats @Rs. 1000 each less: 10% trade discount plus CGST 6% and SGST 6%

Posted by Manpreet Kaur 6 years, 11 months ago

CBSE > Class 11 > Accountancy

0 answers

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State modern periodic law?

Posted by Reshma Khatoon 6 years, 11 months ago

CBSE > Class 11 > Chemistry

2 answers

Yogita Ingle 6 years, 11 months ago

Modern Periodic Law: It states that "The physical and chemical properties of the elements are the periodic function of their atomic numbers."
According to this law, if we arrange the elements on basis of their increasing atomic numbers, we find that the elements with similar physical and chemical behavior will be grouped together after a certain interval of elements.
Here, the "periodic function" is used because the properties of elements are repeated after a periodic time (i.e. after a fix no. of elements) with atomic numbers.

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Lavanya ❤️? 6 years, 11 months ago

The properties of elements are periodic function of their atomic number

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Name the fund needed for day to day operations of business

Posted by Anshul Verma 6 years, 11 months ago

CBSE > Class 11 > Business Studies

3 answers

Rahul Yadav 6 years, 11 months ago

Working capital requirements

0Thank You

Abhik Khare 6 years, 11 months ago

Working capital.

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Reet Sran 6 years, 11 months ago

revenue

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An atom of an element contains 29 electron and 35 neutrons. Deduce the electronic configuration of the element

Posted by Reshma Khatoon 6 years, 11 months ago

CBSE > Class 11 > Chemistry

1 answers

Lavanya ❤️? 6 years, 11 months ago

The electronic configuration of the element = 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d9

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how to solve the adjustment where motor car is used for business and for household purposes in accounts class 11th

Posted by Naman Jain 6 years, 11 months ago

CBSE > Class 11 > Accountancy

1 answers

Abhik Khare 6 years, 11 months ago

Sir please clearify the question.

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Conquest of Brazil by Cabral long ques ans

Posted by Vidushi Sainath 6 years, 11 months ago

CBSE > Class 11 > History

0 answers

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Define Pascal's law???

Posted by Lavanya ❤️? 6 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Lavanya ❤️? 6 years, 11 months ago

Thank u

2Thank You

Ayushi Ayushi 6 years, 11 months ago

Pascal's law basically states that any pressure applied to a fluid inside a closed system will transmit that pressure equally in all directions throughout the fluid. This law is the basic principle that causes hydraulic power in heavy construction machines to work. A hydraulic lift for automobiles is an example of a force multiplied by hydraulic press, based on Pascal's principle.

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Phragmoplast or vesicles are the precursors of ____????

Posted by Tom Mathew 6 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Lavanya ❤️? 6 years, 11 months ago

Phragmoplast or vesicles are the percursors of the new cell wall

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A project on learn to earn

Posted by Kasturi Devi 6 years, 11 months ago

CBSE > Class 11 > Entrepreneurship

0 answers

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25 journal entries with diff transactions

Posted by Siddhi Agrawal 6 years, 11 months ago

CBSE > Class 11 > Accountancy

0 answers

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What is the phase difference between two nearest crest and trough

Posted by Ram Pandey 6 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Gaurav Seth 6 years, 11 months ago

The linear distance between two successive crests is equal to one wavelength.
The phase difference corresponding to two successive crests is equal to 2 pi radians (or) 360 degrees.

1Thank You

Kashish Mehta 6 years, 11 months ago

2π

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What is Tensile stress or longitudinal strain

Posted by Yadav Suraj 6 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Yogita Ingle 6 years, 11 months ago

Longitudinal strain: If the deforming force produces a change in length alone, the strain produced in the body is called longitudinal strain or tensile strain.

Tensile Stress: If the stress applied causes an increase in the body’s length because of the force the stress is termed as tensile stress.

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Ram Pandey 6 years, 11 months ago

They both are same meaning

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experiment to detect the presence of bile salts in urine

Posted by Kritika Bhargava 6 years, 11 months ago

CBSE > Class 11 > Biology

1 answers

Meghna Thapar 5 years, 4 months ago

Seed dormancy is defined as a state in which seeds are prevented from germinating even under environmental conditions normally favourable for germination. These conditions are a complex combination of water, light, temperature, gasses, mechanical restrictions, seed coats, and hormone structures. Seed dormancy allows seeds to overcome periods that are unfavourable for seedling established and is therefore important for plant ecology and agriculture. Several processes are known to be involved in the induction of dormancy and in the switch from the dormant to the germinating state.

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What is entalpy

Posted by Sahil Malha 6 years, 11 months ago

CBSE > Class 11 > Chemistry

3 answers

Ankit Singh 6 years, 11 months ago

Nice answer Ayushi

2Thank You

Ayushi Ayushi 6 years, 11 months ago

Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.

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Lavanya ❤️? 6 years, 11 months ago

Enthalpy is a property of a thermodynamic system, is equal to the system's internal energy plus the product of its pressure and volume.

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Where is central problem of an economy chapter

Posted by Ravindra Singh 6 years, 11 months ago

CBSE > Class 11 > Economics