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Derive an equation of center of mass

Posted by Jass Matta 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Chirag Sharma 5 years, 11 months ago

The center of mass (CoM) is not an equation, it's a definition. The center of gravity, on the other hand, is an equation. So yes, that formula is just a definition, but it is not a random one. After you define it, it turns out to have multiple nice properties. But that's not by chance, but because of that special form. And that's because it is the weighed average position. That means, it is the average position, but weighed according to masses. If you have two masses, m1 and m2, in positions 1 and 2, then you would easily compute average in the same way you calculate your average score in school: r⃗ mean=r⃗ 1+r⃗ 22 And it is obviously right in the middle of them. Half the distance. Notice that this is the same as r⃗ mean=12(r⃗ 1+r⃗ 2) Now, what if m2 is twice m1? Then m2 is like having two units of m1 placed in the same site. That's like having three particles: r⃗ mean=r⃗ 1+r⃗ 2+r⃗ 23=r⃗ 1+2⋅r⃗ 23 And that's the same as r⃗ mean=13(r⃗ 1+2⋅r⃗ 2)=13r⃗ 1+23r⃗ 2 Can we generalize this? What if it is m2=1.5m1? or any other? Check that 1/3 and 2/3 are precisely m1/M and m2/M, where M is the total mass. So yes, we have r⃗ CM=m1Mr⃗ 1+m2Mr⃗ 2+⋯=1M∑imiri→ The usual formula. It's a definition, yes, but it is the average, and that makes it have special properties that other definitions would not have.

ANSWER

Derivation of terminal velocity

Posted by Sourav Goswami 5 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Beast Boy 5 years, 11 months ago

Are tu padhti bhi hai kya???

Aayu... A?V 5 years, 11 months ago

the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.

ANSWER

The acceleration due bo gravity on surface of the mars is 3.7 m/s what is the time period simple pendulum if it's time period on earth is 2sec

Posted by Virender Chouhan 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Give two examples with reason when body become weightless

Posted by Karandeep Singh 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Farhat Shaikh Shaikh 5 years, 11 months ago

Earth orbiting astronaut are weightless free falling elevator is weightless this is because there is no external contact force in pushing or pulling up on their body the force of gravity is the only force acting upon their body.

ANSWER

Give two applications of elastic behaviour of material

Posted by Karandeep Singh 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 5 years, 11 months ago

The rubber strip of the slingshot has high elasticity. Elasticity is the ability of a body to resist any permanent change to it when stress is applied. When stress application ceases, the body regains its original shape and size. Different materials show different elastic behavior. Almost every engineering design requires knowledge of the elastic behavior of materials. In a construction of various structures like bridges, columns, pillars, beams, etc. knowledge of the strength of the materials used in the construction is of prime importance.

ANSWER

100 grams of water is super cool to -10 degree Celsius. At this point, due to some disturbance mechanised or otherwise some of its suddenly freezes to Ice. What will be the temperature of the resultant mixture and how much much would it freeze?

Posted by Nikita Swain 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

The internal energy of an ideal gas depends on ........?

Posted by Samiya Siddiqui 5 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Vansh Prajapati 5 years, 11 months ago

The internal energy of a fixed mass of an ideal gas depends only on its temperature (not pressure or volume). The specific enthalpy of a gas described by pV = nRT also depends on temperature only. Note that the enthalpy is the thermodynamic quantity equivalent to the total heat content of a system.

Farhat Shaikh Shaikh 5 years, 11 months ago

The internal energy of an ideal gas depends only on the temperature not on the pressure and volume.

ANSWER

Change in state and latent heat from thermal properties of matter

Posted by Mrunmai Bhosale 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Nikita Swain 5 years, 11 months ago

Change in state: is a reversible physical changes that donnot bring any change in chemical constituent. Laten heat : amount of heat supplied per unit mas of a substance diring a change of state

ANSWER

Find value of CP and CV and gama monocromotic and diomectic gas concedring translation motion along

Posted by Vipin Mayank 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Obtained and expression the time period of pisten

Posted by Vipin Mayank 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Define inertia of direction

Posted by Gagan Singh 5 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Nikita Swain 5 years, 11 months ago

The tendency of a body to continue its direction of motion.

Harsh Tiwari 5 years, 11 months ago

Leave the.. definition come to the.. concept..here is the..best example. We can protect yourself from rain by an umbrella because rain drops can not change its direction..its own due to inertia of.. direction

ANSWER

Find the angle between the vectors A = i - 2j - k and B = - i + j - 2k ?

Posted by Himanshi Bhardwaj 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Aayu... A?V 5 years, 11 months ago

Aap ye question google pe search kr lo brainly pe aaral10 nam se question h.....maine brainly pe pucha tha ans vhi pr h

ANSWER

What is quantum theory?

Posted by Anand Singh 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Harsh Tiwari 5 years, 11 months ago

It is the.. framework for explaining the microscopic phenomenon as classical physic can't explain phenomenon at microscopic level..

ANSWER

Diffrencial equation for s.h.m

Posted by Àñúj Kūmãr 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Tushar Sharma 5 years, 11 months ago

d²y/dt² +w²y =0 is the diffrential equation for S. H. M

ANSWER

What is universal gravitational law?

Posted by Dhiraj Sonkusare 5 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Dhiraj Sonkusare 5 years, 11 months ago

A body attracts towards the earth from infinity distance in called universal gravitational law. In other words the attraction between two body is called universal gravitational law Unit-6.67×10–11 Nm²/Kg²

Vansh Prajapati 5 years, 11 months ago

Newton's law of universal gravitation is usually stated that every particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

ANSWER

What are the principales of conservation of angular momentum

Posted by Rohit Bhuriya 5 years, 11 months ago

CBSE > Class 11 > Physics

3 answers

Farhat Shaikh Shaikh 5 years, 11 months ago

According to the law of conservation of angular momentum if the total external torque on a system of particle is zero then the total angular momentum of the system is conserved i,e remains constant is equivalent to three scalar equation Lx = k1 , Ly= k2, Lz= k3 hear k1 K2 and K3 are constant x y z are component of total angular momentum vector L along the x y z Axis respectively.

Vansh Prajapati 5 years, 11 months ago

Principle of conservation of angular momentum states that, If no external torque acts on a system, the total angular momentum of the system remains constant. If I be the moment of inertia of a body about a given axis of rotation and w be its angular velocity, then I w = constant.

Vansh Prajapati 5 years, 11 months ago

When objects collide without a net external torque, the angular momentum is constant. The two objects exert equal, but opposite angular impulses upon each other to maintain the total angular momentum of the colliding system.

ANSWER

What is stefan law

Posted by Pranshu Pranshu 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Farhat Shaikh Shaikh 5 years, 11 months ago

Stephen's law states that the amount of heat energy imitate per second in per unit area of a perfectly black body is directly proportional to the 4th power of absolute temperature. E∞T⁴

ANSWER

Derive KTG equation and also derive RME of ideal gas

Posted by Nitesh Patel 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Calculate the fall in pressure of helium initially at 1600p when it's suddenly expanded to 8times it originally volume given the y=5/3

Posted by Pawan Kumar Roy 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Trolley type question

Posted by Rohit Yadav 5 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Derived barnoulli theorm

Posted by #Abhay# Kumar 5 years, 11 months ago

CBSE > Class 11 > Physics

3 answers

Rohit Yadav 5 years, 11 months ago

Search at doubt nut app

Ankit Kumar 5 years, 11 months ago

Search in Google.

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ANSWER

describe the selection of origin and sense of passage of time of a body performing one dimensional motion.

Posted by Aayu... A?V 5 years, 11 months ago

CBSE > Class 11 > Physics

7 answers

Rohit ...... 5 years, 11 months ago

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Rohit ...... 5 years, 11 months ago

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Rohit ...... 5 years, 11 months ago

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Rohit ...... 5 years, 11 months ago

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Rohit ...... 5 years, 11 months ago

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Yogita Ingle 5 years, 11 months ago

In one dimensional motion the initial instant of time or zero time (t = 0) is considered at the beginning of the observation of motion. It may not be the instant of beginning of motion. Suppose a ball is thrown from a height of 500 m. It becomes visible say at a height of 100 m. Then origin or initial instant of time or zero time (t = 0) is this instant only and not the instant when motion actually began.
Thus, if zero instant is considered as present then times before the instant is past and time after this instant is future

ANSWER

Venturi meters

Posted by Mayur Pachpor 5 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Gagan Singh 5 years, 11 months ago

Measure the velocity of water

Gayathri Gopal 5 years, 11 months ago

Venturimeter is a flow measurement instrument. Here, a converging section of a pipe is used to give an increase in the flow velocity and a corresponding pressure drop from which the flow rate of the fluid is deduced based on the Bernoulli’s equation.

ANSWER

Motion of slope

Posted by Dikshit Jhamb 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Aayu... A?V 5 years, 11 months ago

Hey mate yur ques may be incomplete...plzz check it again..

ANSWER

Draw the schematic representation of a heat pump

Posted by Pavithra Kotian Pavithra Kotian 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Pawan Chaudhary 5 years, 11 months ago

Tumne mera land heat nikalte hue nhi dekha kya

ANSWER

What we use unit vector?

Posted by Siya Bhatt 5 years, 11 months ago

CBSE > Class 11 > Physics

3 answers

Ykraja Boss 5 years, 11 months ago

To find direction

Yogita Ingle 5 years, 11 months ago

A unit vector is a vector of unit magnitude and a particular direction. They specify only direction. They do not have any dimension and unit.

Siya Bhatt 5 years, 11 months ago

To find direction

ANSWER

Describe Brownian motion

Posted by Jivisha Srivastava 5 years, 11 months ago

CBSE > Class 11 > Physics

7 answers

Rohit Yadav 5 years, 11 months ago

The zigzag movement of particles

Yogita Ingle 5 years, 11 months ago

“Brownian motion refers to the random movement displayed by small particles that are suspended in fluids. It is commonly referred to as Brownian movement”. This motion is a result of the collisions of the particles with other fast-moving particles in the fluid.

Jivisha Srivastava 5 years, 11 months ago

Yes correct

Kunal Pandey 5 years, 11 months ago

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But still i say WhatsApp is better for me

Kunal Pandey 5 years, 11 months ago

This app is only usefull for board exam not for IIT JEE Main and Advance.

Kunal Pandey 5 years, 11 months ago

No idea

ANSWER

What is hoar Frost?

Posted by Jivisha Srivastava 5 years, 11 months ago

CBSE > Class 11 > Physics

7 answers

Farhat Shaikh Shaikh 5 years, 11 months ago

Deposit of ice crystals on object exposed to free air.

Kunal Pandey 5 years, 11 months ago

Hmm

Jivisha Srivastava 5 years, 11 months ago

Stay cool ?

Jivisha Srivastava 5 years, 11 months ago

?

Jivisha Srivastava 5 years, 11 months ago

U better know kilo Joule or Joule per Kelvin

Kunal Pandey 5 years, 11 months ago

?

Kunal Pandey 5 years, 11 months ago

Peta nahi kya hai?

ANSWER

What is water equivalent?

Posted by Jivisha Srivastava 5 years, 11 months ago

CBSE > Class 11 > Physics

3 answers

Yogita Ingle 5 years, 11 months ago

Water equivalent is defined as the amount of water that can replaces any substance gaining the same variation in temperature, when provided with the same amount of energy as that of substance. It is written as W.

Jivisha Srivastava 5 years, 11 months ago

Thank you

Kunal Pandey 5 years, 11 months ago

Absorbtion and emission of mass of water with same heat and same temperature is c/a water equivalent.?

ANSWER

First equation of motion

Posted by Vipin Mayank 5 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Tushar Sharma 5 years, 11 months ago

v=u+at Where, v=final velocity u=initial velocity a=acceleration t=time

Harender Singh 5 years, 11 months ago

v=u+a t is first equation

ANSWER

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