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

Doppler Effect is the phenomenon of motion-related frequency change.
Consider if a truck is coming from very far off location as it approaches near our house, the sound increases and when it passes our house the sound will be maximum. And when it goes away from our house sound decreases. This effect is known as Doppler Effect.

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How to study long hour?

Posted by Shreya Dixit 7 years ago

CBSE > Class 11 > Physics

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Practical and viva qusetions of physics

Posted by Kriti Sharma 7 years ago

CBSE > Class 11 > Physics

1 answers

Kriti Sharma 7 years ago

Send

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Drive lens maker formula

Posted by Saksham Pratap 7 years ago

CBSE > Class 11 > Physics

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5 marks puestions for class 11 final exam2018-19

Posted by Hema Bora 7 years ago

CBSE > Class 11 > Physics

1 answers

Anisha Sharma 7 years ago

Telescope and microscope, Bernoulli theorem,

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Derivations of thermodynamics

Posted by Krishna Omar 7 years ago

CBSE > Class 11 > Physics

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Show that total energy of a body executing SHM is independent of time?

Posted by Durwa Pahariya 7 years ago

CBSE > Class 11 > Physics

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Important theorm

Posted by Shimal Malik 7 years ago

CBSE > Class 11 > Physics

1 answers

Vivek Namdev 7 years ago

Bernoulli

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What is thermodyanmic first law

Posted by Nik Chauhan 7 years ago

CBSE > Class 11 > Physics

2 answers

Kaushal Kumar 7 years ago

If heat is given to the system then partially it is converted into internal energy and remaining will be converted into work done. dQ=dU+dw

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Shubhra Nayak Parida 7 years ago

Energy can neither be created nor be destroyed but it can be transferred from one form to another

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Work energy theorem??

Posted by Anshu Wangru 7 years ago

CBSE > Class 11 > Physics

3 answers

Samya Parmar 7 years ago

W.D. = change in K.E.

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Aashir Arham ⚽?⚽ 7 years ago

The work-energy theorem states that the work done by all forces acting on a particle equals the change in the particle's kinetic energy.

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Naveen Kumar 7 years ago

According to work energy theorem, work and energy are equivalent to each other.

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What is mean of tharmo

Posted by Neeraj Goyal 7 years ago

CBSE > Class 11 > Physics

1 answers

Meghna Sharma 7 years ago

Heat

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What is tharmodynamic

Posted by Neeraj Goyal 7 years ago

CBSE > Class 11 > Physics

2 answers

Tripti Shah 7 years ago

Mutual relationship between heat and mechanical work it means thermodynamics

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Meghna Sharma 7 years ago

Thermo means heat N dynamics means motion It is the branch of physics which deals wih the study of transformation of heat from one form to another form .

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1 Marks Questions 1. A passenger sitting in a car at rest, pushes car from within. The car doesn't move. Why? 2. Give the magnitude and directions of the net force acting on a rain drop falling with a constant velocity. 3. Why the passengers in a moving car are thrown outwards when it suddenly takes a turn? 4. What is the purpose of using shockers in a car? 5. Why are tyres made of rubber not of steel? 6. Wheels are made circular. Why? 7. A force is required to keep a body in uniform motion in a straight line. Comment. 8. On a rainy day skidding takes place along a curved path Why? 9. Why does a gun recoils when a bullet is being fired? 10. Why is it difficult to catch a cricket ball than a tennis ball even when both are moving with the same velocity? 11. Calculate impulse necessary to stop a 1500 kg car moving at a speed of 2 Sms^. (-37500 N-) 12. Lubricants are used between the two parts of a machine. Why? 13. What provides the centripetal force to a car taking a turn on a level road? 14. What is inertial frame of reference? 15. An athlete runs a certain distance before taking a long jump. Why? 16. Action and reaction forces do not balance each other. Why? 17. The wheels of vehicles are provided with mudguards. Why? 18. China wares are wrapped in straw paper before packing? 19. Why is it difficult to walk on a sand? 20. The outeredge of a curved road is generally raised over the inner edge. Why? 21. Explain why the water doesn't fall even at the top of the circle when the bucket full of water is upside down rotating in a vertical circle? 22. Why does a speedy motor cyclist bends towards the centre of a circular path while taking a turn on it? 23. If net force acting upon particle is zero show that its linear momentum remains constant? Ans of all theoritical questions please... It will also help u...

Posted by Viraj Goenka 7 years ago

CBSE > Class 11 > Physics

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A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m/s square . tha crew and the passengers weigh 300 kg. Find the magnitude and direction of the (a) force on floor by the crew and passengers (b) action of the rotor of the helicopter on the surrounding air (c) force on the helicopter due to the surrounding air. Take g=10m/s square

Posted by Geeta Pawar 7 years ago

CBSE > Class 11 > Physics

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What will be the weight of a body at centre of earth and why???

Posted by Nilesh Hiragar 7 years ago

CBSE > Class 11 > Physics

2 answers

Aashir Arham ⚽?⚽ 7 years ago

The weight of the body at centre of the earth is zero because there is zero distance between the centre of earth and body (radius of body is negligible)

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Aashir Arham ⚽?⚽ 7 years ago

The weight of the body at centre of the earth is zero as there is no distance between body and earth (radius of earth become zero and widtg of object is negligible)

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An aero plane takes off at an angle of 30° to the horizontal is 250 km/h, what is the actual velocity? Find also the vertical component of velocity.

Posted by Geeta Pawar 7 years ago

CBSE > Class 11 > Physics

1 answers

Gaurav Seth 7 years ago

Let the velocity of the plane be V m/s
horizontal component of velocity =
V cos 30°= 200
v x √3/2 = 200
v = 400/√3
=231 km/hr
vertical component of velocity is
V sin 30 = v/2=115.47 km/h

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Which physical quantity has the unit Watt/meter×K?

Posted by Little .... 7 years ago

CBSE > Class 11 > Physics

3 answers

Shreya Dixit 7 years ago

Coefficient of thermal conductivity

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Viraj Goenka 7 years ago

dQ/dt = KA(∆T)/L K = watt /metre.kelvin

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Viraj Goenka 7 years ago

Thermal conductivity

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derivation of continuity?

Posted by Kunwar Abhay Singh 7 years ago

CBSE > Class 11 > Physics

1 answers

Shatayu Ganvir 7 years ago

Jusy madd flow is constant.

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What is the velocity at maximum height in a projectile?

Posted by Ayush Bhatt 7 years ago

CBSE > Class 11 > Physics

3 answers

Shreya Dixit 7 years ago

V=vcos@ because vertical component is zero only have horizontal component

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Aashir Arham ⚽?⚽ 7 years ago

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Viraj Goenka 7 years ago

If projected velocity is u nd angle is ∆ Then velocity at max height is ucos∆

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What is ascent formula

Posted by Anita Anita 7 years ago

CBSE > Class 11 > Physics

4 answers

Samya Parmar 7 years ago

H=2Scos0/r.g.density

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Meghna Sharma 7 years ago

Liquid rises more in a narrow tube and less in a wider tube because here in case, h is inversely proportional to the radius.

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Meghna Sharma 7 years ago

Ascent formula When one end of capillary tube of radius r is immersed into a liquid of density p which wets the sides of the capillary tube, the shape of the liquid meniscus in the tube becomes concave upwards.it is called ascent formula. In this case, liquid rises more in a narrow tube and less in wider tube.

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Kunwar Abhay Singh 7 years ago

ascent formula is a rise of liquid in a capillart tube. It is inversely proportional to the radius of tube. It is inversely proportional to the density of liquid. It is directly proportional to the surface tension of the liquid.

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why hollow shaft is used in place of solid one

Posted by Akshita Vaish 7 years ago

CBSE > Class 11 > Physics

1 answers

Meghna Sharma 7 years ago

Because the torque required to produce a given twist in hollow cylinder is greater than that required to twist a solid cylinder of the same length and material through the same angle.

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hey wat is the passing marks in physics from 70 marks paper

Posted by Shivshant Prasad 7 years ago

CBSE > Class 11 > Physics