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a body suspended in an atmosphere of 30°C takes 5 mins to cool from 65°C To 55°C find the additional time that it takes to cool further to 45°C

Posted by Sridevi Parimi 7 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Why molar specific heat at const. Pressure is greater than molar specific heat at const.volume?

Posted by Rohan Goyal 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Well the case is simple molar specific heat is amount of heat required to raise the temp of a substance 1mole to 1 celcius so at constant volume particles have no more space to move around so their kinetic energy increases hence increase in temp would be like temp of kinetic energy of particles due to not expanding + heat given. but in case of constant pressure volume will increase causing cooling effect which also needs to be neutralized by heat so total temp would be like heat given to neutralize cooling effect of expanding + heat to rise temp to 1 celcius hence this molar specific heat is greater clearly

ANSWER

Will ray optics comes in board examination of 12th class or not?

Posted by Sumit Goel 7 years, 2 months ago

CBSE > Class 11 > Physics

5 answers

Ankit Singh 7 years, 2 months ago

No it will not come

Chētnà Pandey✌️ 7 years, 2 months ago

No it will not come

Charu Vatsal 7 years, 2 months ago

No, it will not

Yakshi ? 7 years, 2 months ago

Hello dipanshu.....kya tum mujhey jaantey ho????????

Aman Kumar 7 years, 2 months ago

Of course not

ANSWER

Who proposed the heliocentric model of planetary system what was the proposition

Posted by Shobhit Garg 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Sidharth Kt 7 years, 2 months ago

Copernicus(1473-1543) put forward the 'Heliocentric' theory which states that:"The sun is at the centre of planetary system".

ANSWER

What is law of equipartition of energy?

Posted by Gaurav Prasad 7 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Explain zeroth law of thermodynamics ?

Posted by Hemanshu Sharma 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 2 months ago

According to this law, when themodynamics systems A and B are separately in thermal equilibrium with a third themodynamicsytem C, then the systems A and B are in themal equilibrium with each other also.

ANSWER

Explain regelation?

Posted by Shaza Huzain 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Hemanshu Sharma 7 years, 2 months ago

The phenomenon in which ice melts when pressure is increased and again freezes when pressure is removed is called regelation (re=again ; gelare = freeze) .

ANSWER

What is the time period of second pendulum ?

Posted by Vaibhav Sharma 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Garima Kesherwani 7 years, 2 months ago

It is precisely 2 seconds 1 second for swing in one direction and 1 second for return swing..a frequency of 1/2 Hz

ANSWER

Define orbital velocity of satelite

Posted by Sanchit Sharma 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Orbital Velocity of a satellite is the minimum velocity it has to maintain to continue its circular motion in its orbit. We know for a circular motion to continue, a force called centripetal force is required to work upon the object in circular motion. And this force is a real and acts towards the centre of the circle. As this is a real force it’s to be supplied by a real mechanism or system. A satellite moves in a circular track and the centripetal force acting on it is supplied by the gravitational force acting between the earth and the satellite.

ANSWER

Define static equillibrium

Posted by Shivam Kumar 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Static equilibrium: This is the type of equilibrium in which the resultant of all the forces acting on the body is zero, i.e. the net acceleration of the body is zero, and the velocity of body is also zero. It means that the body is at rest. So if a body is at rest and the net acceleration of it is zero, it means the body is in static equilibrium.

ANSWER

Triple point of water

Posted by Sridevi Parimi 7 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Sunila Sharma 7 years, 2 months ago

O. O1c, it is a temperature at which all the three phases that is solid, liquid, gas co-exists

Sanjeev Yadav 7 years, 2 months ago

The temperature and pressure at which a substance can exist in equilibrium state in solid liquid and gas.triple point of water is 273.16k 0.01°C or 32.5°F..

ANSWER

What is degree of freedom.explain it?

Posted by Roshan Jha 7 years, 2 months ago

CBSE > Class 11 > Physics

4 answers

Amrita Gaund 7 years, 2 months ago

It is the minimum number of possibilities of the motion of the molecules. It value depends on the atomicity of the molecules.

Ankit Singh 7 years, 2 months ago

A degree of freedom of a physical system is an independent parameter that is necessary to characterize the state of a physical system. In general, a degree of freedom may be any useful property that is not dependent on other variables.

Yogita Ingle 7 years, 2 months ago

The number of degrees of freedom of a dynamical system is defined as the total number of co-ordinates or independent variables required to describe the position and configuration of the system.
Degrees of Freedom can be defined as independent displacements or rotations that specify the orientation of a body or system.

Ankit Aryan Shivan 7 years, 2 months ago

The degree of freedom refer to the maximum possible independent motion of the gas molecules. [Independent motion refer to translational,rotational,as well as vibrational motion.

ANSWER

Define escape velocity

Posted by Rahul Pandey 7 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Aman Kumar 7 years, 2 months ago

The minimum velocity at which a body is projected from the surface of earth which goes outside the gravitational field of earth...is called escape velocity...

???. Pragati 7 years, 2 months ago

the lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object.

ANSWER

Postulates of kinetic theory of gases??

Posted by ???. Pragati 7 years, 2 months ago

CBSE > Class 11 > Physics

4 answers

Ankit Singh 7 years, 2 months ago

Thank you ??? but i forgot to mention the points sorry

Yakshi ? 7 years, 2 months ago

Very well....???

Ankit Singh 7 years, 2 months ago

The following assumptions are made in developing Kinetic theory of gases. We will show that the Kinetic theory of gases developed with these assumptions explain the macroscopic properties of the materials. All gases consist of some basic units called molecules. The molecules are made up of single or group of atoms depending on the chemical nature of the gas. The molecules move in random direction with random speed. The molecules undergo collisions among themselves and to the walls of the container. These collisions are perfectly elastic. The collision time is very small compared to the average time spent by a molecule between two collisions. The size of the molecule is very small compared to the average intermolecular distance. Molecules do not exert any force among themselves or to the walls except during collision. The molecules obey Newton's Law of Motion. The number of gas molecules is so large that at every position of infinitesimal volume of the container, the density and distribution of different physical parameters are same. The above parameters are also independent of direction and time at a steady state.

???. Pragati 7 years, 2 months ago

Any four??

ANSWER

Why machinery parts get jammed in winter ??

Posted by Priya Dharshini ? 7 years, 2 months ago

CBSE > Class 11 > Physics

7 answers

Ankit Singh 7 years, 2 months ago

Good answer

Aman Kumar 7 years, 2 months ago

By the way, the question is also nice?

Aman Kumar 5 years, 11 months ago

Ooooo...that good..but yaa lets leave this topic otherwise they will again start blocking?

∂Αяѕнαиαα ყα∂Αѵ ??? 5 years, 11 months ago

mind my words I am a that type of girl Jo teen saal purani baat v yaad rekhti hai,, ??? tum toh bus 1 saal purane hoo.. ? ?

∂Αяѕнαиαα ყα∂Αѵ ??? 5 years, 11 months ago

nooo not at all... ? stupid.. ? ? ?

Aman Kumar 7 years, 2 months ago

Gd answer darshana...Hope you had not forgot the person who always use to say genius..to him?

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 2 months ago

In winter due to low temp. the coefficient viscosity of lubricant increases as a result machinery parts get jammed..

ANSWER

A stone is dropped into a well and it's splash is heard at the mouth of the well after an interval of 1.45 sec. find the depth of the well. given that velocity of sound in air at room temperature is 332 m/s

Posted by Shashvat Tripathi 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 2 months ago

First we have given that,,, speed of Sound =332m/s,,,, Time = 1.45 sec......... , depth let it denoted by d=??,,,,,,, speed of Sound wave = 2×distance /time,........ . . 332 = 2×d/1.45............., 2d=332×1.45,,.. when you solve this you will get 240.7 m and it will be ur ans.. hence,,, the depth of well is 240.7m.

ANSWER

Assuming the sun to have a spherical outer surface of radius R, radiating like a black body at temperatures t°c, then what is the power receive by a distance r from the centre of the sun.

Posted by ∂Αяѕнαиαα ყα∂Αѵ ??? 7 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 11 months ago

65

∂Αяѕнαиαα ყα∂Αѵ ??? 6 years, 11 months ago

best

ANSWER

Project are projectile motion

Posted by Khirendra Pujari Khirendra 7 years, 2 months ago

CBSE > Class 11 > Physics

3 answers

Ankit Singh 7 years, 2 months ago

???

Yakshi ? 7 years, 2 months ago

???

Aman Kumar 7 years, 2 months ago

Means???? What u want to ask

ANSWER

At what temperature the speed of sound in air will e 1.5 times its value at 27 degree C in air

Posted by Equra Sohail 7 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What are the important questions of thermodynamics ?

Posted by Anushka Singh 7 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Please tell me all the important derivations of all chapters so that I can get pass marks???

Posted by Yuvraj Singh 5 years, 11 months ago

CBSE > Class 11 > Physics

5 answers

Yuvraj Singh 7 years, 2 months ago

Now tell me otherwise it wil be too late for me

Yuvraj Singh 7 years, 2 months ago

Now it is possible ???

Yuvraj Singh 7 years, 2 months ago

Ch 3 Ch 4 Ch 5 Ch 7 Ch 8 Ch 9 Ch 10

Ankit Singh 7 years, 2 months ago

????yakshi

Yakshi ? 7 years, 2 months ago

It will be easy for us to tell u if u will ask it chapterwise........we will tell u then......???

ANSWER

What is wein's displacement

Posted by Roshan Jha 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Aarav Tyagi 7 years, 2 months ago

Acc. to the weins disolacement ," the max. wavelength corresponding to max. energy is inversely proposnal to the absolute temp. of the body."

ANSWER

What is the relationship between gravitational field intensity and gravitational potential difference

Posted by Nav Ghuman 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Vibhanshu Vishal 7 years, 2 months ago

The gravitational potential gradient dV/dr is defined as the rate of change of gravitational potential with distance in the field. This is equal to the gravitational field intensity at that point

ANSWER

Prove barnollise equation

Posted by Taniah Jain 7 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

What is radius of gyration?

Posted by Abhishek King 7 years, 2 months ago

CBSE > Class 11 > Physics

1 answers

Yogita Ingle 7 years, 2 months ago

Radius of gyration of a body about a given axis is the perpendicular distance of a point from the axis, where whole mass of the body were concentrated, the body shall have the same moment of inertia as it has with the actual distribution of mass.
The units for radius of gyration are length (that is millimeters or inches or feet). It is the square root of the moment of inertia I divided by the area A, (I/A)^0.5. I is length⁴, A is length², (I/A)^0.5being simply length.

ANSWER

What is non metal

Posted by Satyam Kumar 7 years, 2 months ago

CBSE > Class 11 > Physics

2 answers

Yogita Ingle 7 years, 2 months ago

Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity. They are mostly gases and sometimes liquid. Some they are even solid at room temperature like, Carbon, sulfur and phosphorus.

Satwinder Singh 7 years, 2 months ago

Tendency to gain electron and form electronegitive element

ANSWER

a helicopter of mass 1000kg rises with a vertical acceleration of 15m/s2. The total mass of the crew and passengers is 300kg. Give the magnitude and direction of the a. force on the floor of the helicopter by the crew and the passsengers. b. action of the rotor of the helicopter on the surrounding air. c. force on the helicopter due to the surrounding air.

Posted by Pallavi Thakur 7 years, 2 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A stone weighs 400gm in air and appears to weigh 300 gm in water. Waht will it appear to weigh in a) paraffin (sp.gr =0.8) b) brine ( sp. gr.= 1.1)

Posted by Pooja Mondal 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

Specific gravity of mixture of two materials of equal volume is 4. the specific gravity of the mixture becomes 3 when this made this two materials are mixed in equal masses .calculate the specific gravity of the materials

Posted by Pooja Mondal 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

A solid sphere weighs 66gm in air, 41gm in water, 44gm in turpentine.Find (a) volume of sphere (b) the specific gravity of the material and (c) specific gravity of turpentine.

Posted by Pooja Mondal 7 years, 3 months ago

CBSE > Class 11 > Physics

0 answers

ANSWER

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