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

Stokes' law defines the drag force that exists between a sphere moving through a fluid with constant velocity. Viscosity is the resistance of a fluid to flow, and with increasing viscosity, the sphere's velocity drops. When the radius of the sphere increases, the drag force increases too.

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Which out of Na and K has higher melting point

Posted by Anju Shrma 7 years ago

CBSE > Class 11 > Physics

3 answers

Priya Dharshini ☺☺ 7 years ago

Dispersion force or London dispersion forces are a type of force acting between atoms and molecules. They are part of the van der Waals forces. U can get more about it in thermodynamics 2nd page.in vanderwaals force as u know there are 3 types of forces in that one type is dispersion force

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Ankit Aryan Shivan 7 years ago

What is dispersion forces.

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Priya Dharshini ☺☺ 7 years ago

Potasium have higher melting point because of dispersion forces due to distance between valence electrons and nucleus

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Variation of acceleration due to gravity at a depth(d) below the surface of the earth

Posted by Nitin Thapa 7 years ago

CBSE > Class 11 > Physics

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Show that the angular momentum about any point of a single particle moving with constant velocity remains constant throughout the motion

Posted by Balwinder Singh 7 years ago

CBSE > Class 11 > Physics

0 answers

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What is footrule ?

Posted by Kunal Gupta 7 years ago

CBSE > Class 11 > Physics

0 answers

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what is kinetic motion

Posted by Huidrom Pravakaran 7 years ago

CBSE > Class 11 > Physics

1 answers

Mohammed Ayan 7 years ago

The motion posses by kinetic energy(1/2×mv^2)

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Short note on heat, internal energy and work

Posted by Prince Verma 7 years ago

CBSE > Class 11 > Physics

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What is thermodynamics??

Posted by Aditya Soni 7 years ago

CBSE > Class 11 > Physics

3 answers

Ankit Singh 7 years ago

Thermodynamics is the branch of physics that has to do with heat and temperature and their relation to energy and work. The behavior of these quantities is governed by the four laws of thermodynamics, irrespective of the composition or specific properties of the material or system in question.

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Priya Dharshini ☺☺ 7 years ago

Thermodynamics is a science dealing with energy and its transformation.it deals with the relation ship between heat and work and the properties of the system in equilibrium

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Purnima Gaur 7 years ago

It refers to as the change in heat

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Give example of couple from our daily life?

Posted by Kavish Gaur 7 years ago

CBSE > Class 11 > Physics

1 answers

Ruru ❤️ 7 years ago

Door handle at the end of opening Screw driver thicker

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If an object dropped from height "H" if it course 20M distance in last second. Then calculate"H"?

Posted by Lalit Kumar 7 years ago

CBSE > Class 11 > Physics

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Since we know that velocity of photon is equal to wavelength×frequency. If photons move in a wave then its speed should be more than c since the curve has more length than the straight line. How is it possible?? ( Please make graph and try to understand....)

Posted by Shivam Singh Aswal 7 years ago

CBSE > Class 11 > Physics

2 answers

Shivam Singh Aswal 6 years, 11 months ago

No I mean that velocity that is displacement / time is constant i.e. c but the speed according to the graph should be greater than c. How is it possible??

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Arpit Porwal 7 years ago

No the velocity of any object in the universe cannot be more than c. Since there is a curve, it only make difference in the path but the speed remain constant

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Water splashes out of the wheels of moving vehicles

Posted by Ankita Waglekar 7 years ago

CBSE > Class 11 > Physics

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What happen to the inertia of an object when its velocity is double ?

Posted by Sanjana ? 7 years ago

CBSE > Class 11 > Physics

2 answers

Sanjana ? 7 years ago

Thanks

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Ankit Singh 7 years ago

.Inertia is the property of mass that resists change. Therefore, it is safe to say that as the mass of an object increases so does its inertia. ... If you increase either mass orvelocity, the momentum of the object increases proportionally. If you double the mass or velocity you double the momentum.

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What is turbulent motion?

Posted by Divya Tripathy 7 years ago

CBSE > Class 11 > Physics

1 answers

Shiv Sunder Pradhan 7 years ago

When the motion of the particles are not same as there is in streamline motion is turbulent motion

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In kinetics theory of Gas which is the main topic ahould to be learn???

Posted by Anjali Panwar 7 years ago

CBSE > Class 11 > Physics

1 answers

Shiv Sunder Pradhan 7 years ago

The two wrong postulates in the kinetic theory of gas

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Vector law of addition

Posted by Nishant Verma 7 years ago

CBSE > Class 11 > Physics

2 answers

Říý@ ?? 7 years ago

The triangle law of vector addition states that , if two vectors ā and ē are represented by the two sides of a triangle taken in same order ,then, the resultant r will be the third side of that triangle taken on opposite order.

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Priya Dharshini ☺☺ 7 years ago

Triangle law of vector addition states that when two vectors are represented by two sides of a triangle in magnitude and direction taken in same order then third side of that triangle represents in magnitude and direction the resultant of the vectors.

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Water enters a horizontal pipe of non uniform area of cross section with a velocity of 0.5 m/s and leaves the other end with a velocity 0.7 m/s the pressure of water at the one end is 10^3N/m^2 calculate the pressure at the other end

Posted by Astha Srivastava 7 years, 1 month ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What is the difference between stress and tension

Posted by Athrv Arora 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Santosh Meher 7 years, 1 month ago

Tension defines a force that acts axially when an object is pulled on both sides. As it is a force, it has units of pounds or Newtons depending on the types of units you are using. Stress is a result of a force being applied to an object. When the object is loaded with a force, internal components of the object apply internal forces to one another. This effectively deforms the object. Stress, although a result of an applied force, is measured in units of pressure, which is pounds per square inch or Newtons per meter squared.Stress can actually result from tension forces since tension is an applied forces.

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A hydrolic automobile lift is designed to lift cars with a maximum mass of 3000 kg. The area of cross-section of the piston carrying the load is 425cm^3. What maximum pressure would the smaller piston have to bear?

Posted by Shivshant Upadhyay 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Md Mohid 7 years ago

The maximum force which the bigger piston bear, F = 3000kg x 9.8N Area of piston, A= 425 cm^2 = 425 x 10^-4 m^2 Therefore, Maximum pressure on the bigger piston, P = F/A = 3000 x 9.8 / 425 x 10^-4 = 6.92 x 10^5 Pa Since the liquid transmits pressure equally, therefore the maximum pressure the smaller piston can bear is 6.92 x 10^5 Pa.

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If 15.0 CM of water and spirit each are further poured into the respective arms of the tube , what is the difference in the levels of mercury in the two arms ? (Specific gravity of mercury =13.6)

Posted by Shivshant Upadhyay 7 years, 1 month ago

CBSE > Class 11 > Physics

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Explain OHM S law

Posted by Amrendra Singh 7 years, 1 month ago

CBSE > Class 11 > Physics

1 answers

Říý@ ?? 7 years, 1 month ago

Ohm’s law states that , the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged. Mathematically it can be represented as, Potential difference ∝ Current V ∝ I ( When the value of V increases the value of I increases simultaneously) V = IR. Here,V is Voltage in volts (V) R is Resistance in ohm (Ω) I is Current in Ampere (A)

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what is Boyle's Law?

Posted by Joga Khara 7 years, 1 month ago

CBSE > Class 11 > Physics

4 answers

Říý@ ?? 7 years, 1 month ago

Sorry, it's PV= P1V1=P2V2=K

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Říý@ ?? 7 years, 1 month ago

Boyle's law states that, at constant temperature , the volume of a gas is inversely proportional to its pressure. V∝1/p or PV=K. Here, K is a constant. Its value depends upon the nature of the gas, mass of the gas and temperature. P =P1V1=P2V2=K

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Ankit Singh 7 years, 1 month ago

Boyle's Law simply describes the relationship between the pressure and volume of an enclosed gas when Temperature remains constant. That relationship, usually expressed as P1V1 = P2V2, just means that the product of pressure x volume remains unchanged as either or both are changed.

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Priya Dharshini ☺☺ 7 years, 1 month ago

The volume of a given mass of a gas is inversely proportional to its pressure at constant temperature. V ∝ 1 / p or Vp = K K is a constant and its value depends on mass, temperature and nature of gas. ∴ p1V1 = p2V2

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When calculating the escape velocity, why the sum of potential energy and kinetic energy is taken as zero? And why do we calculate it at infinity?

Posted by Kartik ? 7 years, 1 month ago

CBSE > Class 11 > Physics

0 answers

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What is torcilli law?

Posted by Abhay Bhati 7 years, 1 month ago

CBSE > Class 11 > Physics

0 answers

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How to derive volume expansion ? defination also .

Posted by Ankit Singh 7 years, 1 month ago

CBSE > Class 11 > Physics

6 answers

Říý@ ?? 7 years, 1 month ago

Volume expansion can be defined as the expansion in volume due to increase in the temperature. This means that , there is increase in length, breadth and height of a substance.

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Ankit Singh 7 years, 1 month ago

Ok priya why are u telling sorry this chapter not taught to u its not your problem ??

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Anurag Rana 7 years, 1 month ago

hyy

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Priya Dharshini ☺☺ 7 years, 1 month ago

I am sorry this chapter is not taught yet in my school or tution.

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Ankit Singh 7 years, 1 month ago

Its imp