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

1 parsec = 3.26 light years. Largest practical unit of distance. Abbreviation of parallactic second. The distance at which 1.496 × 10^11 m makes an angle of 1".

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Harmanpreet Kaur 3 years, 4 months ago

The distance at which 1A.U. make an angle of 1"

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(1) 1 light year = _______cm (2) 1 AU = _________ (3) 1 persec = ______unit (4) 1 amstron =______cm (5) 1 amstron = _______m (6) 1 Fermi = ________cm

Posted by Sikha Oram 3 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Anjan Karthi 3 years, 4 months ago

Lat one above is (4).

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Anjan Karthi 3 years, 4 months ago

(1) 1 light year = 9.5 × 10^15 m = 9.5 × 10^15 × 10^2 = 9.5 × 10^17 cm // (2) 1 A. U. = 1.496 × 10^11 m // (3) 1 Å = 10^-10 m = 10^-10 × 10^2 = 10^-8 cm.

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Mesurment of time 6 point

Posted by Deepak Yadav 3 years, 4 months ago

CBSE > Class 11 > Physics

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A elevator weight is 4000kg when the upward tension in the supporting cable is 48000N what is upward acceleration starting from the rest how far does it rides in 3 sec.

Posted by Jai Jangid 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 3 years, 4 months ago

F = ma

upward acceleration is 'a'

F is tension

m is elevetor weight

a = F/m

a = 48000 / 4000

a = 12m/s²

v²− u²= 2as

S is height

v = u tat

v = at, u = 4

v = 36m/s

v²= 2as

S = 18m

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Position of a particle changes with time as x = 5t2 - 2t +1 where x is position in m and t is time in sec. Find the average speed of a particle between t=1s to t=4s.

Posted by Sneh Patel 3 years, 4 months ago

CBSE > Class 11 > Physics

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Using a screw gauge the diameter of a metal rod was measured

Posted by Ann Martin 3 years, 4 months ago

CBSE > Class 11 > Physics

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How to do integration basicsss

Posted by Aj Karaiya 3 years, 4 months ago

CBSE > Class 11 > Physics

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what is the time limit for (i)accuracy (ii) error

Posted by Akhil Ak 3 years, 4 months ago

CBSE > Class 11 > Physics

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Expand using binomial (1+3x)⁵ upto the …

Posted by Bhavya Khandelwal 3 years, 4 months ago

CBSE > Class 11 > Physics

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A ball rolls down an inclined track 2m long in 4s find (a) acceleration (b) time taken to cover the second metre of the track (c) speed of the ball at the bottom of the track

Posted by Harshit Karn 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Judith Judith 3 years, 4 months ago

I don't know

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What is the ratio of the time taken to go up and come down by a body thrown vertically up ??

Posted by Tanishka Aggarwal 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Mansi Sakle 3 years, 4 months ago

1. The upward and downward motion are accelerated and retarded by g. hence v-u/g=t where v is zero for upward motion whereas u is zero for downward motion.

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Exercise ka chapter1 ka q no. 1

Posted by Lado Sonkar 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Rohit Singh 3 years, 4 months ago

cbse guide se kar le

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The farthest object (known as Quasers) in our universe are so distant that light emitted by them takes billion of years to reach the earth. What is the distance in km of Quaser from which light takes 3.0 billion years to reach us.

Posted by Abhishek Yadav 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Priyanshi Sharma 3 years, 4 months ago

3 billion light years (ly) = 3 × 10^9 ly 1 ly=9.46 × 10^12 = 0.946 × 10^13 km = 3×10^9 × 0.946×10^13 km = 2.838 × 10^22 km = 2.84 × 10^22 km

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In a car lift compressed air exerts a force F_{1} on a small piston having a radius of 4.0 cm. This pressure is transmitted to a second piston of radius 12 cm. (See figure). If the mass of the car to be lifted is 1200 kg. Calculate F_{1} . What is the pressure necessary to accomplish this task?

Posted by Rudra Bhabhor 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Mansi Sakle 3 years, 4 months ago

chapter -mechanical properties of fluids use simple relation F1/A1 = F2/A2 F1/pi*4^2 = 1200*10/pi*12^2 f1= 1333.3 . . P =f1/a1=f2/a2= 26.5

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Great going everybody

Posted by Divya Kumari 3 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Shagun Kashyap 3 years, 4 months ago

Thanks

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Jaya Laxmi Verma 3 years, 4 months ago

Thank you

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plz provide best quality notes either typed or handwritten of physics chapter 2 units and measurements rather than revision notes. plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.plz.

Posted by Darshan Patel 3 years, 4 months ago

CBSE > Class 11 > Physics

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Jaya Laxmi Verma 3 years, 4 months ago

Folow aakash chanel at telegram you get best notes from there

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??? ??? 3 years, 4 months ago

Mahadev institute of science by Rahul Sharma vedio Sir ki vedio notes related h

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Find of motion for displacement covered by a body in nth sec using calculus method.

Posted by ???????? ☺☺☺ 3 years, 4 months ago

CBSE > Class 11 > Physics

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Prove all three equations of motion by calculus method

Posted by ???????? ☺☺☺ 3 years, 4 months ago

CBSE > Class 11 > Physics

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Contents for screw gauge

Posted by Jyoti Singh 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Jaya Laxmi Verma 3 years, 4 months ago

Follow aakash chanel at telegram you get the contents for screw gauge

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Multiplication errors

Posted by Rebu Do 3 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Priyanshi Sharma 3 years, 4 months ago

Actual values* and these are*. Sorry for mistake

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Priyanshi Sharma 3 years, 4 months ago

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 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Anjan Karthi 3 years, 4 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 ???????? ☺☺☺ 3 years, 4 months ago

CBSE > Class 11 > Physics

2 answers

Preeti Dabral 3 years, 4 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 3 years, 4 months ago

Thanksyou

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

Posted by Mirudhula Murugesan 3 years, 4 months ago

CBSE > Class 11 > Physics

1 answers

Amritansh‌ Pandey 3 years, 4 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 3 years, 4 months ago

CBSE > Class 11 > Physics

4 answers

Harmanpreet Kaur 3 years, 4 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 3 years, 4 months ago

Acceleration -12

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Amritansh‌ Pandey 3 years, 4 months ago

6t-2

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Abc ... 3 years, 4 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