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

if we have to find density, then the formula for density is mass per unit volume. d = m/v The equation will be - DELTA d/d = DELTA m/m + DELTA v/v Here, DELTA d represents the error in density and d represents the actual value of density. Similarly, DELTA m means error in mass whereas m means actual mass and DELTA v means error in volume and v means actual volume. In these questions, 4 values are often given which are of mass and volumes including their errors. These values are written in the form of x + or - delta x where delta x is the error and x is the actual value. So, we can find the actual value of density by putting the actual valued of mass and volume given in the question in the formula density(d) = mass(m)/ volume (v). These is applicable to division and multiplication both.

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Define the quantity and also write thier units and dimensions 1.Length 2.Distance 3. Displacement 4. Area 5. Volume 6. Density 7. Time 8. Mass 9. Speed 10. Velocity 11. Acceleration 12.Jerk 13.Snap 14.Crackle 15.Pop 16.Momentum 17. Force 18. Impulse 19. Tension 20. Work 21. Energy 22. Power 23. Surface tension 24. Pressure 25. Pressure gradient Pls I u can give me ans you will be very good student for me!!

Posted by Siddharth Jangid 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Anjan Karthi 4 years, 2 months ago

1)Length is a measure of how much long something is. Unit is metre and dimension is [L]. 2) Distance is the total length of the path covered by an object with respect to a reference point. Unit and dimension same in length. 3) Displacement is the shortest distance between a starting and finishing point. Unit and dimension same in length. 4) Area is the measure of theregion within a particular boundary. Unit is metre ^2 and dimension is [L^2]. 5) Volume is the total space an object covers. Unit is metre^3 and dimension is [L^3]. 6) Density is the measure of how dense an object is. Unit is kg/m^3 and dimension is [ML^-3]. 7) Time is the measure of how long an incident occurs. Unit is seconds and dimension is [T].

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Explain the following terms: a) Unification b) Reductionism c) Frame of Reference d) Relative error e) Instrumental error

Posted by ???????? ☺☺☺ 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Preeti Dabral 4 years, 2 months ago

a) Unification: It is the act of unifying the different laws valid for different phenomena in to a single theory that explains all the different phenomena. Eg. Electricity, magnetism and light are different phenomena and have different laws of physics for each of them.

b) Reductionism: A related effort is to derive the properties of a bigger, more complex, system from the properties and interactions of its constituent simpler parts. This approach is called reductionism and is at the heart of physics. Science is not based on assumptions while it is based on experiments.

c) Frame of Reference: A coordinate system with time frame is called frame of reference. Objects changing positions with time with respect to the frame of reference are in motion while those which do not change position are at rest. For a moving car, for the frame of reference outside the car, it appears moving.

d) Relative error: Relative error- when used as a measure of precision—is the ratio of the absolute error of a measurement to the measurement being taken. In other words, this type of error is relative to the size of the item being measured. RE is expressed as a percentage and has no units.

e) Instrumental error: Instrument error refers to the error of a measuring instrument, or the difference between the actual value and the value indicated by the instrument. There can be errors of various types, and the overall error is the sum of the individual errors. Types of errors include. systematic errors. random errors.

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Kunal Pandey 4 years, 2 months ago

Thanksyou

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ANSWER

Differentiate y=x^2+5x+7 with respect to x

Posted by Mirudhula Murugesan 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Amritansh‌ Pandey 4 years, 2 months ago

2x+5

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The displacement of particle is x=3t square -2t+5. Calculate the velocity and acceleration at t= 2 seconds.

Posted by Nandini Nagda 4 years, 2 months ago

CBSE > Class 11 > Physics

4 answers

Harmanpreet Kaur 4 years, 2 months ago

X=3t^2-2t+5. We will solve it by differentiation. V=d(3t^2-2t+5)/dt V=d(3t^2)/dt-d(2t)/dt+d(5)/dt V=6t-2+0 At t=2,V=6×2-2 V=10m/s Now a=d(V)/dt a=d(6t-2)/dt a=d(6t)/dt -d(2)/dt a=6-0 a=6×t^o At t=2,a=6m/s2

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Amritansh‌ Pandey 4 years, 2 months ago

Acceleration -12

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Amritansh‌ Pandey 4 years, 2 months ago

6t-2

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Abc ... 4 years, 2 months ago

10 m/s

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Find out the unite and dimensions of the constants a and b in the van der waals. Equation ቀ? + ௔ ௏మቁ (V-b) = RT

Posted by Ansh Gupta 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Sakshi Sonvane 4 years, 2 months ago

Conservation of energy

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Sia ? 4 years, 2 months ago

Please ask question with complete information.

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speed of the sprinter 36 kmph. how much time does the sprinter take to cover a distance of 100m

Posted by Daksh Dhaka Dhaka 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Amritansh‌ Pandey 4 years, 2 months ago

Time-10sec

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the speed of the sprinter 36 kmph. how much time does the sprinter take to cover a distance of 100m?

Posted by Mithali Pattanaik 4 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

How much time would a police man take to catch a thief if the velocity of police man is 20m/s and the acceleration of thief is 1m/s square and the distance between them is 150m

Posted by Bhargav Navin 4 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Preeti Dabral 4 years, 2 months ago

Just suppose both Policeman and thief are running in the same direction.

Given :-

Acceleration of Thief = 1 m/s²

Velocity of Police = 20 m/s

Using the first equation of motion :-

v = u + at

20 = 1 × t

t = 20 s

Note :-

1. The velocity of Policeman must be more than that of thief otherwise the thief will never be caught.

2. When both will have equal velocity then also thief can never be caught.

3. Relative Velocity of theif w.r.t police will be lesser than that of relative velocity of police w.r.t thief.

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Bhargav Navin 4 years, 2 months ago

Thank you for the reply of my question but we cannot get the answer by only supposing them in the same direction as it would create more doubts in our mind

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Bhargav Navin 4 years, 2 months ago

Not actually I think we should choose thief as the frame of reference and then assume that thief is in rest and watching the police then we will get that the distance between police man and thief is becoming large and large as there is the acceleration of thief and police man has constant velocity so that there would be two answers means that police man and thief meet two times first when police man suddenly speed up then it will be the first meeting during g running and finally on that position where police man will be caught

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What is excitement of physics

Posted by Ujala Pandey 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Mamta ... 4 years, 2 months ago

Excitement means curiosity to know how it happens or what happens.

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Sia ? 4 years, 2 months ago

The excitement of physics comes from the challenge in conducting new experiments for revealing the secrets of nature. The scientific progress is not only qualitative but also quantitative analysis. The basics levels, laws and theories of physics are universal. There is good strategy of approximation.

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Find the values of sin(1485)

Posted by Kommu Sandhya 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 2 months ago

sin (-1485°)

= - sin (1485)

(sin (-x) = -sin x)

= - sin (4.360°+45°)

= - sin (45°)

{sin (2nπ+a) = sin a}

= -12√12

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Rounding off 18.35 upto 3 digits

Posted by Harini Kamali 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Priyanshi Sharma 4 years, 2 months ago

18.4 is the answer

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A velocity time relation of electron starting from given rest is given by v is equal to kt where k is equal to 2 m per second squad calculate the distance travel 3 second

Posted by Parmar Nayan 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 4 years, 2 months ago

the velocity time relation of an electron starting from rest is given by v=kt, where k=2m/s^-2.

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The mass of a body

Posted by Jiya Joshal 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Sia ? 4 years, 2 months ago

The mass of a body is its inertia or resistance to change of motion. More precisely, it is a property of the body that determines the body's acceleration under the influence of a given force.

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Adithya Dev A 4 years, 2 months ago

The amount of matter present in a body is referred to as its MASS.

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For an ideal gas internal energy depends on

Posted by Neha Verma 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Kunal Pandey 4 years, 2 months ago

1tempreture

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Mitthu Kumar 4 years, 2 months ago

Temperature

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1) check the correctness of the relation Sn= u+ a/2(2n-1) b 1/2mv^2=mgh c,v^2-u^2=2as

Posted by Soniya Rana 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Adithya Dev A 4 years, 2 months ago

c) v^2 - u^2 = 2as. [LT^-1] ^2 - [LT^-1]^2 = [LT^-2] [L]. Therefore, as principle of homogeneity is followed, the equation is dimensionally consistent.

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Adithya Dev A 4 years, 2 months ago

b) 1/2mv^2 = mgh. [M] [LT^-1] ^2 = [M] [LT^-2] [L]. [ML^2T^-2] = [ML^2T^-2]. Hence, the principle of homogeneity is followed and the equation is dimensionally consistent.

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A person starts from his home and travels to a hill station which is 100km from his home. In the course of his journey he had to stop in two different place , one is at 40km and 75km. Time for his entire journey is 3 hours. Find the average speed .

Posted by Balaji G Xi 4 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Adithya Dev A 4 years, 2 months ago

The reactants in a chemical reaction which get used up completely first, limiting the amount of products produced are called LIMITING REAGENTS.

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Raju Kumar 4 years, 2 months ago

Limiting reagents

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A person starts from a point and goes north 10 Km in 20mins , takes a left turn goes 4km in 6mins and again turns left and goes 2km in 2mins.

Posted by Balaji G Xi 4 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

If infinty l^a T^b M^c Then find the formula for frequency.

Posted by Soniya Rana 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Adithya Dev A 4 years, 2 months ago

Frequency = 1/t = t^-1 = [M^0 L^0 T^-1]//

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ANSWER

(1) check the correctness of the relation Sn= u+ a/2(2n-1) b 1/2mv^2=mgh c,v^2-u^2=2as

Posted by Soniya Rana 4 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Which law is used to explain rocket propulsion

Posted by Lucky Lucky 4 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Anshika Saxena 4 years, 2 months ago

Newtons 3rd law

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Write the name of nature of physical law ?

Posted by Prerna Sahu 4 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Ankush Garlapad 4 years, 3 months ago

I don't know search in google,?

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A body is dropped from the top of a tower, which falls through 40m during the last two seconds of its fall. What is the height of tower ?(g= 10 m/s2)

Posted by Shashwat Singh 4 years, 3 months ago

CBSE > Class 11 > Physics

2 answers

Preeti Dabral 4 years, 3 months ago

45m

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Shashwat Singh 4 years, 3 months ago

Where is solution?

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Limitations of the Dimensional Method

Posted by Praduman Kumar Pandey 4 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Preeti Dabral 4 years, 3 months ago

Limitations of dimensionless analysis:

This method does not tell us how to determine the proportionality constant value.
The method cannot be considered to derive composite relations. Examples s = ut + 1/2 at² and 2as = v² – u².
A formula containing trigonometric function, exponential function, and logarithmic function can not derive from it.
The method cannot be used to derive the relationship between more than three quantities.

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Derive dimension formula of work and force

Posted by Sushil Shukla 4 years, 3 months ago

CBSE > Class 11 > Physics

1 answers

Preeti Dabral 4 years, 3 months ago

The dimensional formula of Work is given by,

M¹L^-2T^-2

Where,

M = Mass
L = Length
T = Time

Derivation

Work (W) = Force × Displacement . . . . . (1)

Since, Force = Mass × acceleration = M × [L T^-2]

∴ The dimensional formula of Force = M¹ L¹ T^-2 . . . . (2)

On substituting equation (2) in equation (1) we get,

Work = Force × Displacement

Or, W = [M¹L¹T^-2] × [M⁰L¹T⁰] = [M¹ L²T^-2].

Therefore, work is dimensionally represented as [M¹ L²T^-2].

The dimensional formula of force is given by,

M¹L¹T^-2

Where,

M = Mass
L = Length
T = Time

Derivation

Force = Mass × Acceleration . . . . (1)

Since, acceleration = velocity × [time]^–¹= [LT^-1] × [T]^-1

Therefore, the dimensional formula of acceleration = [LT^-2] . . . . (2)

On substituting equation (2) in equation (1) we get,
Force = m × a
Or, F = [M] × [L¹T^-2] = M¹L¹T^-2.
Therefore, Force is dimensionally represented as M¹L¹T^-2.