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

Solution verified Verified by Toppr At t=0..50s the x−and y- coordinates are x=v 0x t =(9.0ms −1 )(0.50s)=4.5m y=− 2 1 gt 2 =− 2 1 (10ms −2 )(0.50s) 2 =− 4 5 m the negative value of y shows that this time the motorcycles is below its starting point. The motorcycle's distance from the origin at this time. r= x 2 +y 2 = ( 2 9 ) 2 +( 4 5 ) 2 = 4 349 m The components of velocity at this time are v x =v 0x =9.0ms −1 v y =−gt=(−10ms −2 )(0.50s)=−5ms −1 The speed (magnitude of the velocity ) at this time is v= v x 2 +v y 2 = (9.0ms −1 ) 2 +(−5ms −1) 2 = 106 ms −1

0Thank You

ANSWER

A man can swim with speed of 4km/hr in still water. How long does he take to cross a river 1km wide if the river flows steadily at 3km/hr and he makes his strokes normal to the river current?

Posted by Nikita Jain 3 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar Sain 3 years, 10 months ago

Solution verified Verified by Toppr Since he makes his strokes normal to the river current, the movement of the river will have no effect on the time of crossing the bank. The time will be, T= Speed Distance = 4 1 hr=0.25hr=15min. In the same time, he will go down by Distance=Speed x time=3km/hr x 0.25hr=0.75km=750m

1Thank You

ANSWER

A ball is kicked at an angle of 35° with the ground. a.. What should be the initial velocity of the ball so that it hits a target that is 30metre away at a height of 1.8meter ? b... What is the time for the ball to reach the target?

Posted by Rahul Parul 3 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar Sain 3 years, 10 months ago

Answer: hola mate here is ur answer a) x = V0 cos(35°) t 30 = V0 cos(35°) t t = 30 / V0 cos(35°) 1.8 = -(1/2) 9.8 (30 / V0 cos(35°))2 + V0 sin(35°)(30 / V0cos(35°)) V0 cos(35°) = 30 √ [ 9.8 / 2(30 tan(35°)-1.8) ] V0 = 18.3 m/s b) t = x / V0 cos(35°) = 2.0 s tq♥️

0Thank You

ANSWER

Notes of chapter 2,3,4

Posted by Ankit Kumar Sain 3 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Shahid Ahmed 3 years, 10 months ago

Ask ur classmates

1Thank You

ANSWER

What is the temperature of the steel copper junction in the steady state of the system

Posted by Pratheek M 3 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Sandeep Yadav 3 years, 10 months ago

1Thank You

ANSWER

Assertion-the result of every measurement by any measuring instrument contain some uncertainty Reason- this uncertainty in measurement is accuracy

Posted by Sejal Chaudhari 3 years, 10 months ago

CBSE > Class 11 > Physics

2 answers

Aseem Mahajan 3 years, 10 months ago

A is true R is false. That uncertainty is error

0Thank You

Ankit ............ 3 years, 10 months ago

Both are true

0Thank You

ANSWER

Sir , what is projectile motion

Posted by 11H22 Vasanth 3 years, 10 months ago

CBSE > Class 11 > Physics

3 answers

Edutainment Harsh 3 years, 10 months ago

A projectile motion is a motion in body is moving horizontally and vertically as well or simply it is a 2- dimensional motion

0Thank You

Rahul Parul 3 years, 10 months ago

Eg. Neeraj chopra throw javelin Kicked football

1Thank You

Rahul Parul 3 years, 10 months ago

A projectile is a name given to a body which is thrown with the initial velocity and then allow to move under the action alone.

1Thank You

ANSWER

Dimensional formulas

Posted by Vasudha Vasudha 3 years, 10 months ago

CBSE > Class 11 > Physics

3 answers

Deepanshu Varshney 3 years, 10 months ago

We can write Dimentional Formula of any unit using mass, length and time.

0Thank You

Mannu Dahiya 3 years, 10 months ago

It is in the form of MLT( mass, length, time)

0Thank You

Jp Saigirisha 3 years, 10 months ago

(M°d°T-1}

0Thank You

ANSWER

100-100/100-100=?

Posted by Karan Dubey 3 years, 10 months ago

CBSE > Class 11 > Physics

5 answers

Anjan Karthi 3 years, 10 months ago

Cannot be determined.

0Thank You

Sakshi Bharadwaj 3 years, 10 months ago

0Thank You

Vasudha Vasudha 3 years, 10 months ago

0Thank You

Ankit Rawat 3 years, 10 months ago

0Thank You

Karan Dubey 3 years, 10 months ago

0Thank You

ANSWER

Show that lawn roller is easier to pull rather than push

Posted by Nikita Chhetri 3 years, 10 months ago

CBSE > Class 11 > Physics

3 answers

Manish Rajput 3 years, 10 months ago

0Thank You

Mannu Dahiya 3 years, 10 months ago

While pulling, by weight we can pull, =netforce=weight-fsinTheta(vertically along x-axis). While pushing, by weight and also force is also applied on that to make it push, =net force=weight+Fsintheta

0Thank You

Vasudha Vasudha 3 years, 10 months ago

When the lawn roller is pulled, the normal component decreases that means the cosine component of force decreases. ... This will increase the frictional force. Therefore we can say that it is easier to pull the lawn roller than to push it because the normal component of force decreases when the lawn roller is pulled.

0Thank You

ANSWER

How is a target fixed for shooting or firing from a gun from inside the moving plane

Posted by Mr. X 3 years, 10 months ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar Sain 3 years, 10 months ago

Given, u=0m/s, Vertical componenet of initial velocity s=4.9cm=0.049m g=9.8m/s 2 d=25m Applying 2nd equation of motion in vertical direction s=ut+ 2 1 gt 2 s=0×+ 2 1 gt 2 s= 2 1 gt 2 t= g 2s = 9.8 2×0.049 t=0.1sec Velocity, v= t d v= 0.1 25 =250m/s

0Thank You

ANSWER

Motion in plane line

Posted by Atul Singh 3 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Vasudha Vasudha 3 years, 10 months ago

Motion in a plane is called a motion in two dimensions. Its examples are projectile motion, circular motion. For the analysis of such motion, our reference is an origin and two co-ordinate axes viz: X and Y-axis and scalar and vector physical quantities

0Thank You

Mansi Joshi 3 years, 10 months ago

Motion in a plane line

4Thank You

ANSWER

What is a blackhole ?

Posted by Sudhanshu Shekhar 3 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Priya Tomar 3 years, 11 months ago

A black hole is an area of such immense gravity that nothing—not even light—can escape from it.

3Thank You

ANSWER

A marble moving with some velocity collides perfectly elastically head-on with another marble at rest having mass 1.5 times the mass of the colliding marble. The percentage of kinetic energy by the colliding marble after the collision is

Posted by Bhoomika Sharan 3 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Manish Rajput 3 years, 10 months ago

6Thank You

ANSWER

Is S. L Arora is perfect for preparation

Posted by Mohit Sharma 3 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A body is moving with uniform acceleration it's velociy (a) will be increasing (b)will be decreasing (c) will be uniform (d) will increase first and decrease afterwards

Posted by Anshika Patel 3 years, 11 months ago

CBSE > Class 11 > Physics

4 answers

Mansi Joshi 3 years, 10 months ago

velocity changes at uniform rate If the velocity of an object changes at a uniform rate, then the acceleration that causes the change in velocity is called uniform acceleration or constant acceleration. For example, the force of gravity imparts an acceleration uniformly which is called acceleration due to gravity. Hence,option B is correct.

0Thank You

Divya. Kumari 3 years, 11 months ago

It will be increased

0Thank You

Ansh Dwivedi 3 years, 11 months ago

Yess

0Thank You

Anjan Karthi 3 years, 11 months ago

(a) will be increasing

1Thank You

ANSWER

NCERT class 11 physics practical

Posted by Vivek Kumar Gupta 3 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

I want best notes of physics for NEET Can u all suggest me the best website or utube channel

Posted by Mannu Dahiya 3 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

The frequency of f of a stretched string depends upon the tension F length l of the string and the mass per unit t length mew of string. Derive the formula for frequency.

Posted by Debasmita Dash 3 years, 11 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A boy completes a semicircle of radius 7m in 5 second. The distance travelled by the boy is? Give full explanation.

Posted by Harleen Kaur 3 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Mannu Dahiya 3 years, 11 months ago

2πr/2 (for circumference of semicircle) = 22/7*7=22

1Thank You

ANSWER

How can we study physics subject??

Posted by Cilestina Lepcha 3 years, 11 months ago

CBSE > Class 11 > Physics

3 answers

Heena Kangtani 3 years, 11 months ago

Clear your concept Solve ncert question and some extra question which is available on this app Practice every day And do revision compulsory

2Thank You

Mannu Dahiya 3 years, 11 months ago

Through notes

1Thank You

Vikas Singh 3 years, 11 months ago

By reading the book

1Thank You

ANSWER

How to do Differentiation

Posted by Diksha Devi 3 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Rihan Khan 3 years, 11 months ago

Learn topic table

0Thank You

ANSWER

What are neuton law of motoin

Posted by Harshit Kashyap 3 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Sia ? 3 years, 11 months ago

The first states that a body continues in a state of rest or uniform motion in a straight line unless it is acted on by an external force.

2Thank You

Ashok Kumar 3 years, 11 months ago

First law= if any object in motion wants to be in motion, if any object in rest wants to be in rest unless, until external force applied on it. It is also called inertial law of motion... Second law= the rate of change of momentum is directly proportional to the applied external force... According to this law force is defines as product of mass and acceleration.. Third law= every action their is equal and opposite reaction , it is also called as action reaction pair...

2Thank You

ANSWER

Two forces equal in magnitude act on a particle. When square of their resultant is equal to three time their product find angle between them?

Posted by Falak Chauhan 3 years, 11 months ago

CBSE > Class 11 > Physics

2 answers

Anjan Karthi 3 years, 11 months ago

Hope it helps. ?

0Thank You

Anjan Karthi 3 years, 11 months ago

If the forces are F1 = F2, then R^2 = 3 F1F2 = 3 F1^2. Therefore, F1^2 + F2^2 + 2F1F2cos θ = 3F1^2. Or, 2F1^2 + 2F1^2 cos θ = 3F1^2. 2F1^2 (1 + cos θ) = 3F1^2. cos θ = 3/2 -1 = 1/2. Therefore, angle = cos^-1 (1/2) = 60//

4Thank You

ANSWER

A bus is moving with a speed of 10m/s on a straight road. A scooterist wishes to overtake the bus in 100s. If bus is at dist. of 1km from scooterist., with what speed should the scooterist chase bus?

Posted by Falak Chauhan 3 years, 11 months ago

CBSE > Class 11 > Physics