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

Strong nuclear force is responsible to hold the protons and neutrons together. Strong nuclear force is about 10³¹ times stronger than gravity. They act at short distances and are very strong.

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what is dopler effect?

Posted by Anjali Sharma 7 years, 1 month ago

CBSE > Class 11 > Physics

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Gaurav Seth 7 years, 1 month ago

When the source of sound and the listener have a high relative velocity between them the pitch or frequency of the sound heard by the listener goes on changing. When the distance between the two decreases the pitch increases and vice versa. This motion related frequency change is called Doppler Effect.

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Give important TOPICS for final exams of 2019 march

Posted by Jitendra Kumar 7 years, 1 month ago

CBSE > Class 11 > Physics

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Derive Formula of kinetic energy

Posted by Akash Kumar 7 years, 1 month ago

CBSE > Class 11 > Physics

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Sureshi Bisht 7 years, 1 month ago

Newton 3 law v(squ)=u(squ)+2as...1 W=(ma)s....2 Using 3 law Valu of s=v(squ)/2a...3 Putting in eq....2 W=mas W=ma.v(sqa)/2a (solving) We get K=m(vsqu)/2 or work done

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Akash Kumar 7 years, 1 month ago

1/2 mv v

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Define free fall . also mention it's graph

Posted by Rohit Ramayanam 7 years, 1 month ago

CBSE > Class 11 > Physics

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Prakhar J 7 years, 1 month ago

downward movement under the force of gravity only.

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What happens to the state of motion of a body when the concurrent forces acting on a body are in equilibrium

Posted by Shivani Kashyap 7 years, 2 months ago

CBSE > Class 11 > Physics

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Shailendra Kumar 7 years, 2 months ago

Net Force 0

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The bob of a vibrating simple pendulum is made of ice. How will the time period of swing will change when the ice starts melting??

Posted by Rishabh Jain 7 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Pragati Gola 7 years, 2 months ago

As ice starts melting the length(length of string +distance from center of mass ) increses hence,time period will increase

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Shailendra Kumar 7 years, 2 months ago

When the ice completely not melting after that he stop

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Find pressure on swimmer 10m below the surface of water

Posted by Faisal Wasim 7 years, 2 months ago

CBSE > Class 11 > Physics

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Shailendra Kumar 7 years, 2 months ago

100000

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Ashwani Dubey 7 years, 2 months ago

H=10 Rho=1000 G=9.8

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Ashwani Dubey 7 years, 2 months ago

Height×rho×g

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What is the moment of inertia of a disc about one of its diameters

Posted by Suryanshi Saloni 5 years, 11 months ago

CBSE > Class 11 > Physics

1 answers

Archit Mittal 7 years, 2 months ago

Ml^2/4

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If a body of mass 'M' is devided in two parts such that the gravitational force b/w them is maximum.Find mass of Each part?

Posted by Vivek Chaudhary 7 years, 2 months ago

CBSE > Class 11 > Physics

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Hooke's law

Posted by Shivika Kakran2824 7 years, 2 months ago

CBSE > Class 11 > Physics

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Shailendra Kumar 7 years, 2 months ago

Stress/strain = constant

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Ayushi Ayushi 7 years, 2 months ago

According to Hooke's law strain produced in any body, is directly proportional to stress applied within the elastic limit. Moreover, For a spring, F needed to extend or compress by some distance X is proportional to that distance. That is,F=- kX , where k is a constant factor characteristic of the spring: its stiffness, and X is small compared to the total possible deformation of the spring. Assumption: 1. This law is true only for linear elastic bodies.

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State and prove work energy theorem

Posted by Amit Kumar 7 years, 2 months ago

CBSE > Class 11 > Physics

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Tom Mathew 7 years, 2 months ago

Work energy theorem states that change in kinetic energy of a particle is equal to the work done on it by the net force.

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A child kicks a ball resting on a smooth floor in a room at the meed of the parallel walls. The ball rebounds from one wall with reduced speed and moves to opposite wall where it stops. Draw the relevant position time graph and explain it.

Posted by Panku 45 Mahant 7 years, 2 months ago

CBSE > Class 11 > Physics

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What is dimensional analysis of any physical quantity? Deduce the relationship of time period of a simple pendulum with the length of the string and acceleration due to gravity.

Posted by Panku 45 Mahant 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Akanksha Kumari? 7 years, 1 month ago

T=2 ×pie ×(L/g)^1/2

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Define the term gravitational potential. Derive an expression for the gravitational potential at a point in the gravitational field of the earth.

Posted by Panku 45 Mahant 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Change in gravitational potential energy of a system is defined as the -ve of the work done by the gravitational force as the configuration of the system is changed.

U_f - U_i = W_gr

Change in gravitational potential energy of two point masses m1 and m2 as their separation is changed from r₁ to r₂ is given by
U(r₂) - U(r₁) = Gm₁m₂ [1/r₁ - 1/r₂]

If, at infinite separation, gravitational potential energy is assumed to be zero, then the gravitational potential energy of the above two point mass system at separation r,
U(r) = -G m₁m₂/r

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Show that torque please equal to the product of force and the perpendicular distance of its line of action from the axis of rotation.

Posted by Panku 45 Mahant 7 years, 2 months ago

CBSE > Class 11 > Physics

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What is Torque? Give its unit. Show that it is

Posted by Panku 45 Mahant 7 years, 2 months ago

CBSE > Class 11 > Physics

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Yogita Ingle 7 years, 2 months ago

Torque is the tendency of a force to cause or change the rotational motion of a body. It is a twist or turning force on an object. Torque is calculated by multiplying force and distance.
The SI units of torque are newton-meters or N*m. Even though this is the same as Joules, torque isn't work or energy so should just be newton-meters.

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Kavish Gaur 7 years, 2 months ago

The turning effect of force is torque and its unit is newton metre

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What is node and anti node in physics

Posted by Kavish Gaur 7 years, 2 months ago

CBSE > Class 11 > Physics

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Yogita Ingle 7 years, 2 months ago

One characteristic of every standing wave pattern is that there are points along the medium that appear to be standing still. These points, sometimes described as points of no displacement, are referred to as nodes. There are other points along the medium that undergo vibrations between a large positive and large negative displacement. These are the points that undergo the maximum displacement during each vibrational cycle of the standing wave. In a sense, these points are the opposite of nodes, and so they are called antinodes.

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Kavish Gaur 7 years, 2 months ago

I mean in waves

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Obtain the following a particle performing projectile motion. (a) maximum height (b) time of flight

Posted by Panku 45 Mahant 7 years, 2 months ago

CBSE > Class 11 > Physics