CBSE > Class 11 > Physics | CBSE Board | Homework Help

The tangential component of the force of interaction between two surfaces in contact is called friction. It leads to resistance against movement between the surfaces and can cause mechanical deformation and heating. Depending on whether the surfaces are at rest or in relative motion against each other, the friction divides into static and kinetic friction.

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Swastik . P 4 years, 9 months ago

Kinetic friction comes to play when body is moving on the other hand static fraction comes to play when body is about to move (not moving actually).

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A car travels from a to b at a speed of 20km h and returns at a speed of 30 km h

Posted by Anuj Chaudhary 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Karthika Karu 4 years, 9 months ago

Let us assume the distance between A to B is x km. So , the car travels a total distance of (x+x) = 2x km. Now, the car travels at a speed of 20 km/hr from A to B . So, time taken by the car to reach at the point B from point A is given by, Car travels 20 km in 60 minutes. Car travels x km in (60÷20)×x minutes = 3x minutes Now, in the time of returning the car returns at a speed of 30 km/hr. So, time taken by the car to reach A from B is given by, Car travels 30 km in 60 minutes. Car travels x km in (60÷30)×x minutes = 2x minutes. So , the car takes a total time of ( 3x+2x)=5x minutes. Now , the average speed of the car for the whole journey is given by, In 5x minutes the car covers a distance of 2x km. So, in 60 minutes the car covers a distance of (2x÷5x)×60 km = 24 km. So , the average speed of the car for the whole journey is 24km/hr.

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इस अर्थ वेयर to श्रिंक suddenlyव्हाट व् हैपन टू द लेंथ ऑफ द डे एक्सप्लेन

Posted by Pankaj Rathore 4 years, 9 months ago

CBSE > Class 11 > Physics

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Two blocks of masses 2kg and 3kg are connected to a metal wire going over a smooth massless pulley as shown.The radius of wire is 0.40 nm and length of the wire is 1.20 m. Calculate the elongation of the wire .Given that Y of material is 9.2x1010Nm-2 .Take g=10 ms-2

Posted by Vinayak Yadav 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Suditi Agrawal 4 years, 9 months ago

Show the figures also

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Suditi Agrawal 4 years, 9 months ago

Y is not clear plzz mention again

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There is a steel wire of length 2m and cross section area 1.2mm2 .What force

Posted by Vinayak Yadav 4 years, 9 months ago

CBSE > Class 11 > Physics

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What is the dimensions of candela

Posted by Khushi Tikania 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Manjeet Sahu 4 years, 9 months ago

It is the SI unit of luminous intensity. It has no dimensions although it can be used a dimension. As the dimensions of luminous intensity is [M⁰ⁿ^0 L^0T^0 cd^1]

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Kishan Singh 4 years, 9 months ago

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Prso exam hai .. kush nahi aata ... Koi tip?

Posted by Anirudh Bhadwal 4 years, 9 months ago

CBSE > Class 11 > Physics

4 answers

Kumari Shruti 4 years, 9 months ago

Be clam in examination and first select some chapters from every subject 5 to 6 and do it nicely learn definitions derivations and important things prepare only those 5 to 6 chapters from each subject you will pass definately.

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Khushi Tikania 4 years, 9 months ago

Ab toh muskil tera paas hona

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Nav Dahyia 4 years, 9 months ago

Bro try to learn all the formulas and derivations also read the theory part once

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Royal Thakur ? 4 years, 9 months ago

Firstly Keep calm and just chill...go through your notes and solve at least 2 questions of each concept ...all the best ?

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Anushka tum kaha se ho

Posted by Nik . 4 years, 7 months ago

CBSE > Class 11 > Physics

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During propagation of longitudinal waves through a medium the quantity /quantities transmitted is

Posted by Varsha Singh 4 years, 9 months ago

CBSE > Class 11 > Physics

3 answers

Shivam P 4 years, 9 months ago

Energy

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Khushi Tikania 4 years, 9 months ago

Energy

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Varsha Singh 4 years, 9 months ago

Energy

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Derivation of mean free path

Posted by Sushmita Kumari 4 years, 9 months ago

CBSE > Class 11 > Physics

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An elevator

Posted by Sankar Mohanty 4 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

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Derive expression of surface tension

Posted by Karishma Bhadana 4 years, 5 months ago

CBSE > Class 11 > Physics

1 answers

Preeti Dabral 4 years, 5 months ago

Surface tension is defined as, The ratio of the surface force F to the length L along which the force acts. Mathematically, surface tension can be expressed as follows: T=F/L.

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If we are being provided with the angle and the time it has taken .....cant we find the angular velocity just dividing angle with time

Posted by Drishty Kamboj 4 years, 9 months ago

CBSE > Class 11 > Physics

1 answers

Madhav Soni 4 years, 9 months ago

yes you can

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Why electron have negative charge

Posted by Vin Nara 4 years, 9 months ago

CBSE > Class 11 > Physics

2 answers

Jinesh K Patel 4 years, 9 months ago

We know that atom is electrically neutral and at that time only protons were discovered so they stated that there is negatively charged body which make atom electrically neutral and later was termed as electron

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Himani Rajput 4 years, 9 months ago

Electric charge is a physical property of matter. It is created by an imbalance in a substance's number of protons and electrons. The matter is positively charged if it contains more protons than electrons, and it is negatively charged if it contains more electrons than protons.

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`On the basis of dimensions, decide which of the following relations for the displacement of a particle undergoing simple harmonic motion is not correct: y = a sin 2 / ππtT y = a sin vt. y = aTsin(ta)aTsin⁡(ta) y = a2–√(sin2πtT−cos2πtT)a2(sin⁡2πtT−cos⁡2πtT) (a = maximum displacement of the particle, v = speed of the particle. T = time-period of motion).

Posted by Ajay Sahu 4 years, 9 months ago

CBSE > Class 11 > Physics

0 answers

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Difference between conservative and non conservative force

Posted by Neeru Diya 4 years, 10 months ago

CBSE > Class 11 > Physics

5 answers

Nav Dahyia 4 years, 9 months ago

Conservative force -Those forces whose work done is not dependent on the nature of path taken it only depends on initial and final positions .eg- Gravitational force, elastic force, magnetic force. Non conservative force-Those forces whose work done is dependent on initial and final positions as well as on the nature of path taken. Eg- frictional force ,viscous force

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Snehel Kar 4 years, 9 months ago

• Conservative force - Gravitational force • Non-Conservative force - Friction force

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Tushar Sehgal 4 years, 9 months ago

?Conservative force :- A force is aid to be conservative if workdone by or against the force in moving a body depends only on initial and final point and not on the nature of path . Eg, gravitational force ?Non conservative force :- A force is said to be non conservative if workdone by or against the force in moving a body depends on path between initial and final point . Eg, friction force etc.

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Abhishek Verma 4 years, 9 months ago

O dontknow

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Prashant Pandey 4 years, 9 months ago

Conservative force - The force through which the work done between the two points is path independent is called conservative force. Non-Conservative Force - The force through which the work done between the two bodies is path dependant is called non conservative force.

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.1 mole of an ideal gas at 5OOK expands isothermally until its volume becomes 3 times.Find amount of work done and heat absorbed in the process? (Use R=8.3 Jmol K^(1) and in 3=1 .1 )

Posted by Karamjit Kaur 4 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Nikki Singhal 4 years, 9 months ago

Given: Number of moles of gas = 1 Temperature = 500K To find: The amount of work done and heat absorbed in the process. Solution: Work done in an isothermal process is: W = nRT ln(V2/ V1) W = 1 X 8.3 X 500 ln(3V/ V) W = 4150 ln3 W = 4150 X 1.1 W = 4565 J Heat absorbed in the process = -4565 J because the work done by the gas will go into the heat absorbed by the surrounding. The work done by the gas in the process is 4565 J and the heat absorbed by the surrounding is -4565 J.

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One kilogram molecule of a gas at 400k expands isothermally until its volume is doubled. Find the amount work done and heat produced?

Posted by I Don'T Know 4 years, 10 months ago

CBSE > Class 11 > Physics

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Y= x2+ 1/x2 + 1/ sinx . Find the differentiation

Posted by Sakshi Priya 4 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Zaid Hasan Khan 4 years, 9 months ago

-2/x^3 + 2x - cot(x).cosec(x)

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explain why newtons 2nd law of motion is called the real law of motion

Posted by Naveen Tewatia 4 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Kuldeep G 4 years, 10 months ago

because by newton's 2nd law of motion we can prove first law and third law of motion.

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Barnollis principal

Posted by Dr.Ballu Kumar 4 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Himani Rajput 4 years, 9 months ago

Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in static pressure or a decrease in the fluid's potential energy.

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What are called waves ? Mention there importance

Posted by Prapti Kaujalgi 4 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Nitin Semwal 4 years, 10 months ago

A wave is a disturbance that moves energy from one place to another. Only energy — not matter — is transferred as a wave moves. The substance that a wave moves through is called the medium. ... But the wave travels along the medium.

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estimate the size of an oleic acid molecule

Posted by Chanchal Patil 4 years, 10 months ago

CBSE > Class 11 > Physics