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What is ultimate or tensile strength

Posted by Rakesh Kumar 6 years, 11 months ago

CBSE > Class 11 > Physics

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Why in lakes water freeze from top to bottom

Posted by Golu Sharma 6 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 6 years, 11 months ago

During severe winter, the temperature of water in the lake keeps on decreasing. Since cold water is heavier, it keeps on going into the interior of the lake while warm water keeps on coming to the surface of the lake. This process continues till the temperature of entire water of lakes becomes 4°C. Since density of water is maximum at 277 K, any further decrease in the temperature will decrease its density. As a result, the temperature of the surface water keeps on decreasing and it ultimately freezes. Now, any further decrease in the temperature will decrease the temperature of water below 4°C. This process continues and as a result, the lakes keep on freezing from top to bottom.

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Why does cricket players lower his hands while catching a ball

Posted by Pathak Ashu 6 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 6 years, 11 months ago

While catching a ball, a cricket player lowers his hands, because by doing so, he increases the time of catch. That is, the person increases the time to bring about a given change in momentum, and hence rate of change of momentum decreases.

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A 120 g mass has velocity of v(vector)=(2i^ ➕5j^) m/s at a certain instant t . What is the k. E.

Posted by Sonu Dhakad 6 years, 11 months ago

CBSE > Class 11 > Physics

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Two tuning forks when sounded together produced 3 beats/sec.On loading one of them of a little wax, 20 beats are heard in 4 seconds. Find its frequency, if that of other is 386

Posted by Shreya Singh 7 years ago

CBSE > Class 11 > Physics

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equation of motion of car on level circular road

Posted by Anmol Gill 7 years ago

CBSE > Class 11 > Physics

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Equation of motion in vector form give its solutions

Posted by Sanjay Chaudhari 7 years ago

CBSE > Class 11 > Physics

3 answers

Anisha Sharma 7 years ago

Sia .......just give answer to Sanjay....... Don't ask for friendship here..... It's an app for study not for making friends....... I'm not here to scold you or let you feel down..... I'm just suggesting you...... Please don't mind it..... I'm saying it because I have read somewhere in comments that if we talk like this then our account can be diminished and blocked by cbse for without any reason and without any notification.......

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Sia Mourya 7 years ago

Will u be my friend ?

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Sia Mourya 7 years ago

Hi friend?

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Define and derieve the mayor's formula

Posted by Balwant Singh 7 years ago

CBSE > Class 11 > Physics

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Calculate the surface area of a solid cylinder of diameter 4cm and height 20 cm in mm.sq

Posted by Swadha Chaubey 7 years ago

CBSE > Class 11 > Physics

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a body of mass 2kg travel according to the law X equal to p t+ q t square + rtcube where p is equalto 3 M per second Q is equal to 4 metre per second square and R equal to 5 M per second cube what is the force acting on the body at that time two seconds

Posted by Ranesh Rajit 7 years ago

CBSE > Class 11 > Physics

1 answers

Sudarshan Sharma 7 years ago

128 answer

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Find how will it rise and how much time will it take to return to its point of projection if a body is thrown up with a velocity of 784.4ms?

Posted by Gaurav Kumar 7 years ago

CBSE > Class 11 > Physics

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a steel ball A of mass 20 kg moving with a speed of 2m/s collides wirh another ball B of mass 10kg which is initially at rest. After that collision A off with a speed of 1m/s at an angle of 30 degree with its original direction of motion. Determine the final velocity of B.

Posted by Sharvan Kumar 7 years ago

CBSE > Class 11 > Physics

0 answers

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Find acceleretion due to gravity at a hight of R/3from the surface of the earth where R is radius of the earth

Posted by Pardeep Nogiya 7 years ago

CBSE > Class 11 > Physics

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a)define centripetal force give suitable example. b)if the length of the second hand is 4 cm then calculate 1)the speed of the tip of the second hand 2)The angular speed of the second hand of a clock

Posted by Amit Kumar 7 years ago

CBSE > Class 11 > Physics

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Explain the following: a) it is easier to pull lawnmower to push it.. b) the weight of a person, standing on a weighing machine can be more than his true weight,if the weighing machine with the person or it,is moving up with some accelaration.

Posted by Satyam Srivastav 7 years ago

CBSE > Class 11 > Physics

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What is bernolies theorem and what is stocks law?

Posted by Prashant Singhania 7 years ago

CBSE > Class 11 > Physics

2 answers

Apurwa Shyam 7 years ago

Bernoulli's theorem relates the pressure difference b/w two points in a pipe to both kinetic & potential energy change. It states that as we move along a streamline the sum of the pressure, the K.E.& P.E. per unit volume remains a constant. P+(1/2) pv^2+pgh=constant Stoke's law states that the viscous drag force F on a sphere of radius a moving with a velocity v through a fluid of viscosity is, F=-6(pi)(eta)av.

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Riya Sharma 7 years ago

Barnollies therom = when any liquid passes through any tube then the sum of pressure energy, kinetic energy, and gravitational energy is always constant.

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how a ballet dancer does take the advantage of principle of conservation of angular momentum

Posted by Hritika Yadav 7 years ago

CBSE > Class 11 > Physics

0 answers

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What will be length of antenna for frequency 3×10000 hz

Posted by Ajay Soni 7 years ago

CBSE > Class 11 > Physics

0 answers

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laws of reflection of light

Posted by Anupam Saurabh 7 years ago

CBSE > Class 11 > Physics

1 answers

Sanskriti Verma 7 years ago

Their are two laws of reflection :- 1: angle of reflection is equal to the angle of incidence. 2: reflected ray incident ray a'd normal all lies at the same plane

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Do we have any syllabus changes in all the subjects in class 12 I.e., cbse class 12 2019-20?

Posted by R Meera Raghunaathan 7 years ago

CBSE > Class 11 > Physics

2 answers

Priya Dharshini ? 7 years ago

Yes meera... we will come to know it by 1st week of april.... pattern of paper is going to be changed and few chapters are going to be excluded... mainly in english many things are excluded also

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Sanskriti Verma 7 years ago

No not now. If any I will inform you

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two vectors a vector and b vector are such that a vector + b vector is equals to a vector minus b vector then the correct statement is first option a vector is equals to zero second option b vector is equals to zero third option neither a vector and b vector is zero and fourth option necessarily both a vector and b vector zero

Posted by Ranju Gupta 7 years ago

CBSE > Class 11 > Physics

1 answers

Sudarshan Sharma 7 years ago

2nd option

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What is gravity?

Posted by Yash Motivation 7 years ago

CBSE > Class 11 > Physics

4 answers

Ibthisam I ?? Save Farmers 7 years ago

Gravitational force is an attractive force due to virtue of their masses. Gravity is given by earth's center. Please don't confuse.

2Thank You

Sagar Pandya 7 years ago

Objects*

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Sagar Pandya 7 years ago

Force of mutual attraction between two pbjects by virtue of their masses

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Aaditya Sinha 7 years ago

Gravity is a force which is given by the earth crust.

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Why does not a man inside an insulated matallic cage receive a shock when the cage is highly charged?

Posted by Prasanna Acharya 7 years ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 7 years ago

Gauss' law, which states that the flux is equal to net charge enclosed divided by Eo(permittivity in vacuum) It is clear from the problem that there is no charge inside the sphere, because the charge always reside outside the bodies. When there is no charge inside, implies the flux is zero. Hence, A man inside insulated metallic cage doesn't receive shock when the cage is highly charged. When the flux is zero, then electric field is also zero.

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Find the expression of time period using simple pendulum oscillating in SHM

Posted by Hritik Raj 7 years ago

CBSE > Class 11 > Physics

1 answers

Ibthisam I ?? Save Farmers 7 years ago

T= 2π√(L/g)

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drive the safe velocity of a cyclist nagotiating a curve road

Posted by Bharat Khutela 7 years ago

CBSE > Class 11 > Physics

1 answers

Sudarshan Sharma 7 years ago

Root Rgtantheta

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What is escape speed

Posted by Vimlesh Yadav 7 years ago

CBSE > Class 11 > Physics

2 answers

Sudarshan Sharma 7 years ago

It is not virus actually it is virtue

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Sudarshan Sharma 7 years ago

When we give the binding energy to a particle then it total energy becomes 0 or if we give more energy then binding energy then it's total energy become positive (however no system in universe has positive energy) so a total 0 energy means that the particle has escaped the gravitational pull of a system. So in this case the total potential energy of a particle but the virus of the system in which it is present is converted into kinetic energy and the speed with which the particle escapes the gravitational pull or the opposing force is called the escape velocity.

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What is the affect of pressure on speed of sound?

Posted by Nikhil Rana 7 years ago

CBSE > Class 11 > Physics