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Distance covered in first interval , x_1 = 30 × 5/18 × 15 × 60 m = 7500 m In second interval , x_2 = 40 × 5/18 × 15 × 60 m = 10000 m In third interval , x_3 = 60 × 5/18 × 30 × 60 m = 30000 m Total time = t_1+ t_2 + t_3 = 15×60 +15×60 +30×60s = 900 + 900 + 1800s = 3600 s = 1h Average speed = (x_1+ x_2 + x_3)/( t_1+t_2+t_3) = (47500/3600) ms^-1 = 47.5 km/ h

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Pawan Kumar Jha 6 years, 6 months ago

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Definition of 1 minute

Posted by Om Om 6 years, 6 months ago

CBSE > Class 11 > Physics

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Sia ? 6 years, 6 months ago

1 minute is a period of time equal to 60 seconds; one sixtieth of an hour.

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Definition of 1cm

Posted by Om Om 6 years, 6 months ago

CBSE > Class 11 > Physics

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Sia ? 6 years, 6 months ago

A centimetre (international spelling as used by the International Bureau of Weights and Measures; symbol cm) or centimeter (American spelling) is a unit of length in the metric system, equal to one hundredth of a metre, centi being the SI prefix for a factor of 1100.

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Definition of 1 second

Posted by Om Om 6 years, 6 months ago

CBSE > Class 11 > Physics

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Ayushi Chauhan 6 years, 6 months ago

1 second is the angle subtended by an arc of 1 A.U. when radius of circle is 1Parsec

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Sia ? 6 years, 6 months ago

The second (abbreviation, s or sec) is the Standard International ( SI ) unit of time.

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Potential energy =A underroot x/ x square + B where x is distance

Posted by Om Om 6 years, 6 months ago

CBSE > Class 11 > Physics

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Class 11 refresher all photos

Posted by Adarsh Jain 6 years, 6 months ago

CBSE > Class 11 > Physics

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Find the angle between the Two vectors A=i^+6j^+3k^,B=-2i^-5j^-4k^

Posted by Bitu Rani Narzary 6 years, 6 months ago

CBSE > Class 11 > Physics

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The molar mass of N2O as well as CO2 is 44g/mol. At 25 degree Celsius and 1 atm, 2L of N2O contains n molecules of gas. The number of molecules in 2L of CO2 under the same condition is?

Posted by Nisha Solanki 6 years, 6 months ago

CBSE > Class 11 > Physics

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A motar cyclist goes round a circular race course of diameter 320 m at 144km/h how far from the vertical must he lean inward to keep his balance

Posted by Ghaint Brothers 6 years, 6 months ago

CBSE > Class 11 > Physics

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What is geometrical meaning of tan thetha

Posted by Prime King 6 years, 6 months ago

CBSE > Class 11 > Physics

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Sia ? 6 years, 6 months ago

In right triangle trigonometry (for acute angles only), the tangent is defined as the ratio of the opposite side to the adjacent side. The unit circle definition is tan(theta)=y/x or tan(theta)=sin(theta)/cos(theta).

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what do you mean ny error?

Posted by Titan Tinu 6 years, 6 months ago

CBSE > Class 11 > Physics

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Anugya Bista 6 years, 6 months ago

The deviation of measured valur from the actual value is defined as ereor.

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Time period depends on mass and force constant

Posted by Abhishek Kumar 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Thakur Nobody 6 years, 6 months ago

I think its incomplete statement ?

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What is weak nuclear force?

Posted by Echan Takhel 6 years, 6 months ago

CBSE > Class 11 > Physics

3 answers

Ayush Sah 6 years, 6 months ago

Example is beta decaying process

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Shraddha Tiwari 6 years, 6 months ago

It Is short range force and appears only in nuclear processes.

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Anugya Bista 6 years, 6 months ago

these are the types of forces that we encounter in both macroscopic world and microscopic world .

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Find the position of the particle, if position of the particle varies with time x=(2t+3)m a) t1= 2 sec b) t2= 5 sec

Posted by Harshpreet Kaur 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Harshpreet Kaur 6 years, 6 months ago

Thank you

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Kunal Sharma 6 years, 6 months ago

7m & 13m respectively

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Notes on physics related to society and technology

Posted by Rekha Devi 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Thakur Nobody 6 years, 6 months ago

Ncert content is enough .....and nothing comes from this chapter in competition exams

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Derive the velocity time relation of body under constant acceleration?

Posted by Nisha Solanki 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Dhruv Sarkar 6 years, 6 months ago

We know for a body under constant acceleration, a=(v-u)/t Hence, v=u+at

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Aryan Kumar 6 years, 6 months ago

Nahi pata school teacher se pucho

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Write properties of scalar and vector product for indirect measurement?

Posted by Nisha Solanki 6 years, 6 months ago

CBSE > Class 11 > Physics

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Sarika's brother was trying to observe the sun. Sarika immediately covered his eyes. a) What values are shown by Sarika? b) What is the technical reason behind this?

Posted by Nisha Solanki 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Thakur Nobody 6 years, 6 months ago

Caring nature of sarika is depicted here And the logical reason is the control and coordination ........class 10th........technical reason also here is that his eyes may get some problems if he observes the sun due ho large amount of light entering into his eyes

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A truck driver travels three fourth of the distance of his run at constant velocity (v) and then travels the remaining distance at velocity of (v/2) find average speed

Posted by Khushi Gatwar 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Dhruv Sarkar 6 years, 6 months ago

Let the total distance be 's'. Now, We know, speed =distance/time Hence, time taken to cover 3/4th distance=(3s/4) ×(1/v)= 3s/4v Also, time taken to cover remaining distance=(s/4)×1/v=s/4v Now, average speed = total distance/total time i.e. s/(3s+s)/4v=. 4v/3 Hence the average speed is 4v/3

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Find differential coefficient of log x

Posted by Meenakshi Sharma 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Pallavi Sikarwar 6 years, 6 months ago

1/x

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Tanvi Chauhan?? 6 years, 6 months ago

1/x

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how many angstorm are there on one metre

Posted by Anugya Bista 6 years, 6 months ago

CBSE > Class 11 > Physics

3 answers

Rishab Jain 6 years, 6 months ago

1*10 ki power 1

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Tannu Tannu 6 years, 6 months ago

10 raised to the power 10 angstrom are present in 1 m

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Tannu Tannu 6 years, 6 months ago

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on which scientific principle calculators and computer are based?

Posted by Anugya Bista 6 years, 6 months ago

CBSE > Class 11 > Physics

1 answers

Rishab Jain 6 years, 6 months ago

Modern technology

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what are the two basic quests in physics

Posted by Anugya Bista 6 years, 6 months ago

CBSE > Class 11 > Physics

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Heat produced in a wire depends upon current flowing resitance R of a wire and time for which current is flowing phiysical relation between physical quantitys

Posted by Pallavi Sikarwar 6 years, 6 months ago

CBSE > Class 11 > Physics

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Explaination of binomial theorem

Posted by Nandani Mehta 6 years, 6 months ago

CBSE > Class 11 > Physics

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Sia ? 6 years, 6 months ago

The binomial theorem (or binomial expansion) describes the algebraic expansion of powers of a binomial. According to the theorem, it is possible to expand the polynomial (x + y)^n into a sum involving terms of the form a x^b y^c, where the exponents b and c are non negative integers with b + c = n, and the coefficient a of each term is a specific positive integer depending on n and b. For example (for n = 4),{tex}( x + y ) ^ { 4 } = x ^ { 4 } + 4 x ^ { 3 } y + 6 x ^ { 2 } y ^ { 2 } + 4 x y ^ { 3 } + y ^ { 4 }{/tex}

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The motion of a partical along a straight line is described by the equation x= 8+12t - t cube where x is in meter and t in sec . The retardation of partical when its velocity become zero

Posted by Manu Devi 6 years, 6 months ago

CBSE > Class 11 > Physics

2 answers

Sia ? 6 years, 6 months ago

On differentiating, displacement, we get velocity.
Velocity(v) = {tex}\frac { d x } { d t } = 12 - 3 t ^ { 2 }{/tex}
Again on differentiating, velocity, we get acceleration.
Acceleration(a) = {tex}\frac { d v } { d t } = - 6 t{/tex}
When velocity becomes zero,
12 - 3t² = 0 {tex}\implies t = 2{/tex}
Therefore,
= -6t = -6 x 2 = -12 ms^-2
The acceleration is negative i.e, retardation.