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Expalne the phenomenon of rounding alevel road

Posted by Ramgopal Yadav 5 years, 1 month ago

1 answers

Meghna Thapar 5 years, 1 month ago

When a vehicle goes round a curved road, it requires some centripetal force. While rounding the curve, the wheels of the vehicle have a tendency to leave the curved path and regain the straight line path. Force of friction between wheels and the roads opposes this tendency of the wheels.

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Write the short note on measurement of length mass and time

Posted by Jaseema Barveen 5 years, 1 month ago

CBSE > Class 11 > Physics

2 answers

Harshree Saraf 5 years, 1 month ago

In this system, length is measured in centimeter, weight is measured in gram, and time is measured in seconds. MKS System: MKS stands for meter, kilogram and seconds.

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Meghna Thapar 5 years, 1 month ago

Any mechanical quantity can be expressed in terms of three fundamental quantities, mass, length and time. For example, speed is a length divided by time. Force is mass times acceleration, and is therefore a mass times a distance divided by the square of a time. CGS System: It stands for centimeter, gram and seconds. In this system, length is measured in centimeter, weight is measured in gram, and time is measured in seconds. MKS System: MKS stands for meter, kilogram and seconds. Here, length is measured in meter, weight in kilogram and time in seconds.

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Types of error ? explain.

Posted by Mansi Vekariya 5 years, 1 month ago

CBSE > Class 11 > Physics

2 answers

Annu Yadav 5 years, 1 month ago

Hii

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Yogita Ingle 5 years, 1 month ago

Types of Errors- Systematic Errors

Errors which can either be positive or negative are called Systematic errors. They are of following types:

Instrument errors: These arise from imperfect design or calibration error in the instrument. Worn off scale, zero error in a weighing scale are some examples of instrument errors.
Imperfections in experimental techniques: If the technique is not accurate (for example measuring temperature of human body by placing thermometer under armpit resulting in lower temperature than actual) and due to the external conditions like temperature, wind, humidity, these kinds of errors occur.
Personal errors: Errors occurring due to human carelessness, lack of proper setting, taking down incorrect reading are called personal errors.

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What is electromagnetic wave?

Posted by Yash Rahadve 5 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 5 years, 1 month ago

Electric and magnetic fields fluctuating together can form a propagating wave, appropriately called an electromagnetic wave.

Equation of plane progressive electromagnetic wave

E = E₀ sin ω (t – x/c)

B = B₀ sin ω (t – x/c)

Here, ω = 2πf

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Two mutually perpendicular forces of 8N and 6N acts on the same body of mass 10kg. Find (a) net force acting on the body. (b) magnitude of acceleration of body.

Posted by Gagan Preet 5 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Nancy Singh 5 years, 1 month ago

net force acting on the body will be the resultant of 8N and 6N u can find the resultant by using parallelogram law and once u got the force and u r already provided with mass by using formula f=ma u can find acceleration

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The ___ is a measure of how closed the measured value is to the value is to the true value of quantity

Posted by Abhishek Jain 5 years, 1 month ago

CBSE > Class 11 > Physics

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Three vectors P,Q,R are given as vectorP + vectorQ = vectorR and P+Q=R. Prove that P and Q are parallel

Posted by Shreya Gupta 5 years, 1 month ago

CBSE > Class 11 > Physics

0 answers

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Class 11 Plzz tell about free fall detailed analysis ..

Posted by Srashti Jain 5 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Aimy Kunnel 5 years, 1 month ago

Free Fall The motion of falling objects is the simplest and most common example of motion with changing velocity. If a coin and a piece of paper are simultaneously dropped side by side, the paper takes much longer to hit the ground. However, if you crumple the paper into a compact ball and drop the items again, it will look like both the coin and the paper hit the floor simultaneously. This is because the amount of force acting on an object is a function of not only its mass, but also area. Free fall is the motion of a body where its weight is the only force acting on an object. Free Fall: This clip shows an object in free fall. Galileo also observed this phenomena and realized that it disagreed with the Aristotle principle that heavier items fall more quickly. Galileo then hypothesized that there is an upward force exerted by air in addition to the downward force of gravity. If air resistance and friction are negligible, then in a given location (because gravity changes with location), all objects fall toward the center of Earth with the same constant acceleration, independent of their mass, that constant acceleration is gravity. Air resistance opposes the motion of an object through the air, while friction opposes motion between objects and the medium through which they are traveling. The acceleration of free-falling objects is referred to as the acceleration due to gravity gg. As we said earlier, gravity varies depending on location and altitude on Earth (or any other planet), but the average acceleration due to gravity on Earth is 9.8 ms2ms2. This value is also often expressed as a negative acceleration in mathematical calculations due to the downward direction of gravity. Equations The best way to see the basic features of motion involving gravity is to start by considering straight up and down motion with no air resistance or friction. This means that if the object is dropped, we know the initial velocity is zero. Once the object is in motion, the object is in free-fall. Under these circumstances, the motion is one-dimensional and has constant acceleration, gg. The kinematic equations for objects experiencing free fall are: v=v0−gty=y0+v0t−12gt2v2=v20−2g(y−y0),v=v0−gty=y0+v0t−12gt2v2=v02−2g(y−y0), where v=velocity, g=gravity, t=time, and y=vertical displacement.

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Ncert solution of physics chapter 2

Posted by Prerana Nahak 5 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Manpreet Kaur 5 years, 1 month ago

Example or exercises

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Define solid angle and plane angle.

Posted by Anshika Bhatia 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Jagdish 5 years, 1 month ago

Plane angle is the measure around a point which is a 2D object. On the other hand, solid angles is for 3D objects. For example, angle of a triangle is a plane angle whereas angle made by the corner of a room is a solid angle.

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Can anyone tell me how to study for mcq in physics.

Posted by Nawal Kishore Jha 5 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Harshree Saraf 5 years, 1 month ago

Read ncert deeply

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Nancy Singh 5 years, 1 month ago

hello nawal I would suggest u to solve number of mcq based questions and u can find a lot of questions on different websites but if u ask me so I prefer learncbse.com if u will search for mcq regarding to any chapter on this website u will find a lot of question best way to improve physics is to solve a number of questions

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The SI units

Posted by Boigou Khongsai 5 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Harshree Saraf 5 years, 1 month ago

The seven SI base units, which are comprised of: Length - meter (m) Time - second (s) Amount of substance - mole (mole) Electric current - ampere (A) Temperature - kelvin (K) Luminous intensity - candela (cd) Mass - kilogram (kg)

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Gaurav Seth 5 years, 2 months ago

The International System of Units (SI units)

The SI units has seven base units and all the other are derived from these seven base units and are called derived units

Base Physical quantity	Symbol	SI units
Length	l	Meter (m)
Mass	m	Kilogram(kg)
Time	t	Sec(s)
Temperature	T	Kelvin(K)
Electric current	I	Ampere(A)
Amount of Substance	N	Mole(M)
Luminous intensity	I_v	Candela(cd)

Speed, Volume, density can be derived from these base Units.Some Common Physical quantity and their derived units

Physical Quantity	Symbol	Name	Unit
Mass	m , M	kilogram	kg
Linear position Length, Distance Radius	x, r l, d R	meter	m
Time	t,	second	s
Area	A	-	m²
Volume	V	-	m³
Density		-	kg/m³
Linear velocity	v, u, c	-	m/s
Linear momentum	p	-	kg*m/s
Linear acceleration	a	-	m/s²
Force	F	newton	N=kg*m/s²
Impulse	I	-	N*s
Work Energy	W E	joule	J=N*m
Power	P	watt	W=J/s

SI Unit system allow the use of prefix to show multiples or sub multiple of units

Prefixes in SI system Multiple	Prefix	Symbol
10^-12	pico	p
10^-9	nano	n
10^-6	micro	μ
10^-3	milli	m
10^-2	centi	c
10^-1	deci	d
10	deca	da
10²	hecto	h
10³	kilo	k
10⁶	mega	M
10⁹	giga	G
10¹²	tera	T

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A motorboat is racing towards North at 25km/h and the water current in that region is 10 km/h in the direction of 60° east of south. Find the resultant velocity of the boat.

Posted by Gautam Chand 5 years, 2 months ago

CBSE > Class 11 > Physics

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Find the magnitude and direction of the resultant of two vectors A and B in terms of their magnitudes and angle theta between them.

Posted by Gautam Chand 5 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Harshree Saraf 5 years, 1 month ago

R²= A² + B² +2ABcos theta

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Jagdish 5 years, 1 month ago

Magnitude of the resultant vector (R) will be given by R² = A² + B² +2ABcos(theta) and the direction will be given by tan(alpha) = Bsin(theta)/[A+Bcos(theta)] where angle alpha is the angle made by resultant vector with the A vector

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Oxygen freezes at -219•c. The Fahrenheit equivalent of this temperature is ( ) A. -350•f B. -282•f C. -362•f. D. 362•f

Posted by Sirisha Antharvedipalem 5 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Vivek Kumar 5 years, 2 months ago

Put the value of °C in equation & vice-versa

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Vivek Kumar 5 years, 2 months ago

-362°C The formula is °F = [(9/5)°C] + 32

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Ncert philloid app me kya hota hai

Posted by Anjali Yadav 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Anjali Yadav 5 years, 1 month ago

Ok thanks

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Jo CBSE ka new syllabus ha 11th ka jo cut hua ha vo 12th me aa gaya to kya jo 11th me cut hua ha vo padhana ha yaa nhi

Posted by Rachana Saini? 5 years, 2 months ago

CBSE > Class 11 > Physics

4 answers

Gunjan Sharma 5 years, 2 months ago

Pata nai

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Anjali Yadav 5 years, 2 months ago

2Thank You

Anjali Yadav 5 years, 2 months ago

Aap apne classes ke mam se puchiye

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Anjali Yadav 5 years, 2 months ago

Aap apne classes ke mam se puchiye

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Dimension of stress n strain??

Posted by Aadya Singh 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 5 years, 2 months ago

The SI unit of stress is Newton per square meter. Or we can express the same in terms of Pascal.
1 Pascal = 1 Pa = 1 N.m-2.
While there is no unit for strain. It is a dimensionless quantity. This is because it is the ratio of change of length to the original length, and therefore it is unitless.

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Which book is best for NEET 11th and 12th physics practice.

Posted by Good Girl ? 5 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Anjali Yadav 5 years, 2 months ago

MTG Publishers best book for neet prepration.

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Laxmi Yadav 5 years, 2 months ago

class 11 < abc of pcb>

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Good Girl ? 5 years, 2 months ago

Is USS good book???

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Write the unit vector in the direction of A= 5i+j-2k?

Posted by Om Tripathi 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Jagdish 5 years, 2 months ago

Unit vector = Given Vector/its magnitude Magnitude of given vector = √25+1+4 =√30 (root 30) So unit vector in the direction of given vector will be 5/√30 î +1√30 j - 2/√30 k

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Best book for physics except NCERT

Posted by Kritika Gupta 5 years, 2 months ago

CBSE > Class 11 > Physics

5 answers

Krishna Padole 5 years, 2 months ago

S.cand

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Raushan Kumar 5 years, 2 months ago

ABC

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Himanshu Shukla 5 years, 2 months ago

ABC

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Parivesh Nath 5 years, 2 months ago

HC Verma Irodo

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Raj Kumar 5 years, 2 months ago

S. L. Arora

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Example of law of conservation of linear momentum

Posted by Hema Gautam 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 5 years, 2 months ago

Two bodies of mass M and m are moving in opposite directions with the velocities v. If they collide and move together after the collision, we have to find the velocity of the system.

Since there is no external force acting on the system of two bodies, momentum will be conserved.

Initial momentum = Final momentum

(Mv – mv) = (M+m)V_Final
From this equation, we can easily find the final velocity of the system.

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A stone dropped from the top of the tree covers 6m height in last 0.2sec of fall. Find the height of the tree?

Posted by Aadya Singh 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 5 years, 2 months ago

Let it will take T time to cover the whole length

so we can say

now in last 0.2 s it will cover 6 m

now by above two equations

now the height of the tree is

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Find the relative error in z if z=A4 B1/3/cd3/2

Posted by Hema Priya Sv Hemapriya 5 years, 1 month ago

CBSE > Class 11 > Physics

0 answers

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A ball is through on with a velocity of 15m/second at an angle of 30degree with the horizontal determine.

Posted by Yadav Ji 5 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Salomi Edward 5 years, 2 months ago

What to determine

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A physical quantity Q is given by Q = A2B3/2/C4D1/2. The percentage error in A, B, C, and D are 4% respectively. what is the percentage error in X ?

Posted by Aadi Shukla 5 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Anjali Yadav 5 years, 2 months ago

Dear question complete karo

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Dimpy Baweja 5 years, 2 months ago

%age error in A,B,C not given... It must be given

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Dimpy Baweja 5 years, 2 months ago

Dear, question incomplete h...

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What is instrumental error??

Posted by Aadya Singh 5 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Aadya Singh 4 years, 10 months ago

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Sathi Gupta 5 years, 1 month ago

?? ?? kritika gupta

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Kritika Gupta 5 years, 2 months ago

It refers to the combined accuracy and precision of measuring instruments or the difference between the actual value and the value indicated by the instrument(error)..........

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