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The sum and difference of two vector A and B are vector a +vector b = 2i+ 6j+k and Vector A and-vector B = 4i+2-11k .Find the magnitude of each vector and their scalar product vector A .vector B

Posted by Shivanki Sharma 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Tripti Rawat 6 years, 6 months ago

Magnitude of vector A = {tex}\sqrt{(2)^2 + (6)^2 + (1)^2}{/tex}={tex}\sqrt{4+36+1}{/tex}={tex}\sqrt{41}{/tex}
Magnitude of vector B = {tex}\sqrt{(4)^2 + (2)^2 + (-11)^2}{/tex}={tex}\sqrt{16+4+121}{/tex}={tex}\sqrt{141}{/tex}

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What is instantaneous velocity?

Posted by Deepjyoti Borthakur 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Guru Hardik 6 years, 6 months ago

The velocity which is present at a certain point of time like -the velocity of car at 2sec and then after 3sec the velocity at that point of time is called instantaneous

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ANSWER

What is a physical unit?

Posted by Akansha Tyagi 6 years, 6 months ago

CBSE > Class 11 > Physics

4 answers

Sia ? 6 years, 6 months ago

Units used in measuring physical quantities.

1Thank You

Pallavi Sikarwar 6 years, 6 months ago

Which can be mesure directly and indirectly

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V. Mithra 6 years, 6 months ago

Units used to identify the physical quantity

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Karan Maheshwari 6 years, 6 months ago

Units used to decide the value of any thing

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ANSWER

What is a physical unit

Posted by Akansha Tyagi 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Anugya Bista 6 years, 6 months ago

The basic mechanical units are those of .All mechanical quantities can be expressed in terms of the three quantities is often known as physical unit..

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Write down in vector form

Posted by Jyoti Singh 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Thakur Nobody 6 years, 6 months ago

What should I write

2Thank You

ANSWER

A drop of olive oil of radius 0.30 millimetres spreads into a rectangular film of 30 cm × 15 CM on the water surface estimate the molecular size of olive oil

Posted by Roshni Kumari 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A man wishes to estimate the distance of a nearby tower from him . He stands at a point A in front of the tower C and spots a very distant object o in line with AC , He then walks prependicular to AC up to B a distnce of 100m , and looks at O and C again . Since O is very distant, the direction BO is practically same as AO but he find the line of sight of C shifted from the original line of sight by an angle parallex = 40 degree estimate the distance of the tower C from his original position from A

Posted by Archana Kumari 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Amber Singh 6 years, 6 months ago

1Thank You

ANSWER

Discuss the importance of graphical studies of uniform motion open object in one dimension.

Posted by Nisha Solanki 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What is physics?

Posted by Jay Parasanna 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Esha Pal 6 years, 6 months ago

It is the study of nature

3Thank You

Jitendra Kumar 6 years, 6 months ago

Physics is the study of natural phenomena and about the nature.

3Thank You

ANSWER

Should we have to learn dervied. &physical quantites

Posted by Kuki Reddi 6 years, 6 months ago

CBSE > Class 11 > Physics

3 answers

Shraddha Tiwari 6 years, 6 months ago

Yaa it's important bcZ it can help us in next chapters

1Thank You

Anirudh Sharma 6 years, 6 months ago

Yes

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Thakur Nobody 6 years, 6 months ago

Not much important But clearing basics of any thing is clearing 20%competition

2Thank You

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What is cosmic radiation

Posted by Ashok Yadav 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Thakur Nobody 6 years, 6 months ago

Cosmic rays are a form of high-energy radiation, mainly originating outside the Solar System[1] and even from distant galaxies.[2] Upon impact with the Earth's atmosphere, cosmic rays can produce showers of secondary particles that sometimes reach the surface. Composed primarily of high-energy protons and atomic nuclei, they are originated either from the sun or from outside of our solar system.

3Thank You

Anima Pandey 6 years, 6 months ago

They r the form of high energy radiations mainly originating outside solar system

2Thank You

ANSWER

What should be the character of scientist

Posted by Satyendra Singh 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Thakur Nobody 6 years, 6 months ago

Curious Attentive to the nature and natural phenomenon So that he could easily notice what is happening in the nature After that he should formulate questions Make theory do experiment do predictions If the prediction made are very correct than he might give a law

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what do you mean by integration

Posted by Lone Tufail 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Devil ? 6 years, 6 months ago

To integrate means to combine

2Thank You

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1st chapter of physics is important?

Posted by Maahi Gupta 6 years, 6 months ago

CBSE > Class 11 > Physics

5 answers

Anugya Bista 6 years, 6 months ago

second chapter is more important than the first

0Thank You

Esha Pal 6 years, 6 months ago

Only for school level examination not for competitive exam

0Thank You

Aditya Narayan Singh 6 years, 6 months ago

not, important but we should read it because it contains basic concepts

1Thank You

Thakur Nobody 6 years, 6 months ago

0Thank You

Devil ? 6 years, 6 months ago

1Thank You

ANSWER

What does the slope of position- time graph indicates?

Posted by Deepanshu Singla 6 years, 6 months ago

CBSE > Class 11 > Physics

5 answers

Thakur Nobody 6 years, 6 months ago

Velocity

1Thank You

Lone Tufail 6 years, 6 months ago

displacement......?

0Thank You

Ayush Kamboj 6 years, 6 months ago

Velocity

0Thank You

Esha Pal 6 years, 6 months ago

Velocity or speed

1Thank You

Ritika Chaudhary 6 years, 6 months ago

Speed

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From the top of a building 39.2m, a ball is thrown vertically upward with a velocity 9.8m–¹. Find the time when the ball will hit the ground.

Posted by Arunpreet Kaur 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Thakur Nobody 6 years, 6 months ago

Given u =9.8 a=-9.8 S=? Applying v=u+at 0=9.8+t×-9.8 -9.8=-9.8t T=1ses Time till it goes up =1sec Now V*2=u*2+2as 0*2=9.8*2 +2×-9.8×s 0=96.04-19.6s S=96.04/19.6 S=4.9m Hieght of building =39.2m Total hieght the ball reached=39.2+4.9=44.1 Now applying s=ut+1/2gt*2 44.1=0×t + 1/2×9.8×t*2 44.1=4.9×t*2 T*2=44.1/4.9 T*2=9 T=3sec

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How will we solve: Modulus of A vector divided by modulus of magnitude of A vector??

Posted by Preeti Rahi 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Why gravitational force is the weakest force?

Posted by Jitendra Kumar 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Aditi Virmani 6 years, 6 months ago

Yes gravitatiin force is weakest in nature Comparison Fg:Fw:fe:fn 1:10 to the power 25:10 to the power36:10 to the p 38

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ANSWER

Question regarding differentiation on quietient rule

Posted by Ronit Sharma 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

4 numericals on deriving a physical relation

Posted by Vishav Lavi 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Hoe many ergs in 1 kilowatt hour

Posted by Mayank Sood 6 years, 6 months ago

CBSE > Class 11 > Physics

3 answers

Anubhav Verma 6 years, 6 months ago

3.6 *10^6j

1Thank You

Thakur Nobody 6 years, 6 months ago

1 kilowatt hours =3.6×10^6joule 1 joule =10^7erg Therfore 1 kilowatt hour has 3.6×10^6+7 =3.6×10^13

2Thank You

Devil ? 6 years, 6 months ago

Bhai ya pta ha ki 1 erg is equal to 10^7 joule

1Thank You

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A body starting from rest,accelerates at a constant rate a m/s² for some time after which it decelerates at a constant rate b/m s² to come to rest finally.If the total time elapsed is t sec,the maximum velocity attained by the body is what?

Posted by Tanvi Chauhan?? 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

If a ball is thrown vertically upwards with speed u,the distance covered during the last t seconds of its ascent is?

Posted by Tanvi Chauhan?? 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Sia ? 6 years, 6 months ago

Let body takes T sec to reach maximum height.
We know, v = u - gT
At the highest point, v = 0
T = {tex}\frac ug{/tex} ………… (i)
Velocity attained by Body in (T - t) s,
v = u - g(T - t)
= u - gT + gt = u - g{tex}\frac ug{/tex} + gt
or v = gt......(ii)
Now, Distance travelled in last t sec of its ascent
s = (gt)t -{tex}\frac 12{/tex}gt² = {tex}\frac 12{/tex}gt²

0Thank You

Tanvi Chauhan?? 6 years, 6 months ago

Sia but its ans is 1/2gt²?

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ANSWER

What is meant by cofficient of elasticity

Posted by Shivam Dubey 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Sia ? 6 years, 6 months ago

Coefficient of elasticity is the ratio of the applied stress to the change in shape of an elastic body.

0Thank You

ANSWER

Formula for turn force ?

Posted by Narendra Kumar 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What is gravitons

Posted by Prajwal Dhiman 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Praneetha Ravula 6 years, 6 months ago

Fundamental particles of gravity

1Thank You

ANSWER

What is physi

Posted by Aman Tiwari 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Shraddha Tiwari 6 years, 6 months ago

Physics is the study natural science.

2Thank You

ANSWER

What is measurement of mass

Posted by Rohit Chougule 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Shraddha Tiwari 6 years, 6 months ago

Kilogram

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Sum of two forces at a point is 16newton if the resultant is smaller to force and has 8newton. Find the two forces

Posted by Piyush Bothra 6 years, 6 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A bomb is thrown from an it which absorb the target of at a height of 1500 is the aeroplane is horizontally with the speed of 500km per hour by how much distance will the bomb miss the target

Posted by Sahil Jangra 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 6 years, 6 months ago

Refer to the similar ques:

A bomb is dropped from an aeroplane when it is directly above target from height 1000 m, aeroplane is moving with velocity 500 kmph find how much distance will bomb miss target ?

Time taken to reach the ground = √(2H/g)
= √(2 × 1000 / 10)
= √(200)
= 10√2 seconds

Distance = Velocity × Time
= (500 × 5/18 m/s) × 10√2 s
= 1964.1 m
= 1.964 km

The bomb wil miss the target by distance of 1.964 km

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