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Fri July 25, 2014  

Ans: A pair of equal and opposite charges seperated by a small vector distance is called an electric dipole. An ideal dipole consists of two very very large charges + q and - q seperated by a very very small distance. An ideal dipole has almost no size. Molecules are made up of positive and negative charges seperated by small distances like water, ammonia etc and they act as electric dipoles. Molecules which have non uniform distribution of charge are known as  polar.P olar molecules will always be slightly negative on one end and slightly positive on the other Polar molecules are said to be  permanent dipoles. Eg: water, carbon dioxide.

Fri July 25, 2014  

Ans:

Fri July 25, 2014  

Ans: When an electron present in p orbital of an atom bonds with the electron present in p orbital of another atom then this type of bonding is known as p pi –p pi bonding. Carbon can form double or triple bonds with other carbon atom or with another element due to p pi -  p pi bonding.

Thu July 24, 2014  

Ans: Dear crys.tiwari@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
 We would like to understand where you are getting stuck on this topic, once we are clear, we would be able to explain things better.
Regards

Topperlearning Team.

Thu July 24, 2014  

Ans: Momentum is the measure of motion contained in a body.

Thu July 24, 2014  

Ans: Dear kumar.ashlesha@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
In case of multiple questions within a query, please post each question individually and let us know where you are getting stuck so that we would be able to explain things better.

Solution of your first query, The composition of wood is not uniform throughout as it contains knots, tree rings, and individual pieces of bark. It is heterogeneous, cellular and anisotropic. Hence, wood is considered as mixture. Regards

Topperlearning Team.

Thu July 24, 2014  

Ans: E x. space 1.4 11 right parenthesis Q u e s t i o n : A space c i r c u l a r space f i e l d space h a s space a space c i r c u m f e r e n c e space o f space 360 space K m. space T h r e e space c y c l i s t s space s t a r t space t o g e t h e r space a n d space c a n space c y c l e space 48 comma space 60 space a n d space 72 space K m space a d a y comma space r o u n d space t h e space f i e l d. space W h e n space w i l l space t h e y space m e e t space a g a i n ? S o l u t i o n : C i r c u m f e r e n c e equals 360 space K m D i s tan c e space c o v e r e d space b y space f i r s t space p e r s o n equals 48 space K m space p e r space d a y D i s tan c e space c o v e r e d space b y space s e c o n d space p e r s o n equals 60 space K m space p e r space d a y D i s tan c e space c o v e r e d space b y space t h i r d space p e r s o n equals 72 space K m space p e r space d a y T i m e space t a k e n space b y space f i r s t space p e r s o n space i n space o n e space r o u n d equals 360 over 48 equals fraction numerator 15 over denominator 2 space end fraction space d a y s equals 15 over 2 cross times 24 equals 180 space h o u r s T i m e space t a k e n space b y space s e c o n d space p e r s o n space i n space o n e space r o u n d equals 360 over 60 equals 6 space d a y s equals 6 cross times 24 equals 144 space h o u r s T i m e space t a k e n space b y space t h i r d space p e r s o n space i n space o n e space r o u n d equals 360 over 72 equals 5 space d a y s equals 5 cross times 24 equals 120 space h o u r s  M i n i m u m space t i m e space t a k e n space b y space 3 space p e r s o n s space t o space m e e t space a t space t h e space s a m e space p o i n t equals L. C. M space o f space 180 comma space 144 space a n d space 120 space h o u r s equals 2 cross times 2 cross times 2 cross times 2 cross times 3 cross times 3 cross times 5 equals 720 space h o u r s equals 720 over 24 space d a y s equals 30 space d a y s

Thu July 24, 2014  

Ans:   Please post individual questions as separate queries.

Thu July 24, 2014  

Ans: Liquid air is ordinary air that has been liquefied by compression and cooling to extremely low temperatures. It is kept in in a vaccum insulated flask to protect it from room tempearature as it absorb heat rapidly and revert to its gaseous state. Liquid air is mainly used in energy storage.

Thu July 24, 2014  

Ans: Dear agrawalmansi2000@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
We have not understood the query that you have posted. We would request you to clarify / provide additional details so that we may answer this to the best of the ability. Please provide the details of P(x). 

Regards

Topperlearning Team.

Thu July 24, 2014  

Ans: Dear agrawalmansi2000@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
We have not understood the query that you have posted. We would request you to clarify / provide additional details so that we may answer this to the best of the ability. Please provide the details of P(x). 

Regards

Topperlearning Team.

Thu July 24, 2014  

Ans: G i v e n space e q u a t i o n space i s space 3 x squared minus 8 x plus 4 square root of 3 Z e r o s space o f space t h e space e q u a t i o n space i s space g i v e n space b y space fraction numerator minus b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction equals fraction numerator 8 plus-or-minus square root of 64 minus 48 square root of 3 end root over denominator 6 end fraction equals fraction numerator 8 plus-or-minus square root of 64 minus 48 square root of 3 end root over denominator 6 end fraction equals fraction numerator 8 plus-or-minus 4 square root of 4 minus 3 square root of 3 end root over denominator 6 end fraction equals fraction numerator 4 plus-or-minus 2 square root of 4 minus 4 square root of 3 end root over denominator 3 end fraction  s o space Z e r o s space o f space t h e space g i v e n space e q u a t i o n space a r e space fraction numerator 4 plus 2 square root of 4 minus 4 square root of 3 end root over denominator 3 end fraction comma fraction numerator 4 minus 2 square root of 4 minus 4 square root of 3 end root over denominator 3 end fraction

Thu July 24, 2014  

Ans: 1) 18967 - On rounding off to three significant digits it becomes 1.90 × 10 4 2) 12.653 -On rounding off to three significant digits it becomes 12.7

Thu July 24, 2014  

Ans: The first two questions can be commonly used. Who is the second son/daughter of your father? Who among you is the second son/daughter of your father? Where do you stand among your brothers/sisters? What is the order of your birth? What is your place in the line of your brothers and sisters? In what rank are you amongst the children of your father?

Thu July 24, 2014  

Ans: Angle trisection is the division of an arbitrary angle into one thrid of it or divide it into three equal angles.   Consider the following figure. Here Angle ABC has been trisected in to three equal parts.

Thu July 24, 2014  

Ans: C o n s i d e r space t h e space f o l l o w i n g space f i g u r e. G i v e n space t h a t comma z equals x plus y minus y over 2 equals x plus y over 2.... left parenthesis 1 right parenthesis F r o m space t h e space r i g h t space t r i a n g l e comma space A B C comma space b y space P y t h a g o r a s space T h e o r e m comma space w e space h a v e comma z squared equals x squared plus y squared.... left parenthesis 2 right parenthesis S u b s t i t u t i n g space t h e space v a l u e space o f space z space f r o m space e q u a t i o n space left parenthesis 1 right parenthesis comma space i n space e q u a t i o n space left parenthesis 2 right parenthesis comma space w e space h a v e comma open parentheses x plus y over 2 close parentheses squared equals x squared plus y squared rightwards double arrow x squared plus y squared over 4 plus 2 cross times x cross times y over 2 equals x squared plus y squared rightwards double arrow y squared over 4 plus x cross times y equals y squared rightwards double arrow x y equals y squared minus y squared over 4 rightwards double arrow x y equals fraction numerator 3 y squared over denominator 4 end fraction rightwards double arrow x equals fraction numerator 3 y over denominator 4 end fraction rightwards double arrow x over y equals 3 over 4

Thu July 24, 2014  

Ans: C o n s i d e r space t h e space f o l l o w i n g space f i g u r e. H e r e space capital delta A B C space i s space a space r i g h t space t r i a n g l e. S i n c e space A E space a n d space C F space a r e space t h e space m e d i a n s space o f space t h e space t r i a n g l e comma space A F equals B F equals x over 2 a n d A E equals E C equals y over 2 A l s o comma space i t space i s space c l e a r space t h a t space t r i a n g l e s space A B E space a n d space C B F space a r e space r i g h t space t r i a n g l e s. A p p l y i n g space P y t h a g o r a s space T h e o r e m comma space w e space h a v e comma x squared plus open parentheses y over 2 close parentheses squared equals 5 squared a n d open parentheses x over 2 close parentheses squared plus y squared equals open parentheses 2 square root of 10 close parentheses squared rightwards double arrow x squared plus y squared over 4 equals 25... left parenthesis 1 right parenthesis a n d x squared over 4 plus y squared equals 40.... left parenthesis 2 right parenthesis A d d i n g space t h e s e space e q u a t i o n s space left parenthesis 1 right parenthesis space a n d space left parenthesis 2 right parenthesis comma space w e space g e t comma fraction numerator 5 x squared over denominator 4 end fraction plus fraction numerator 5 y squared over denominator 4 end fraction equals 65 rightwards double arrow 5 x squared plus 5 y squared equals 4 cross times 65 rightwards double arrow 5 x squared plus 5 y squared equals 260 rightwards double arrow x squared plus y squared equals 52 rightwards double arrow z squared equals 52 rightwards double arrow z equals 2 square root of 13  

Thu July 24, 2014  

Ans: G i v e n comma space a space tan theta space plus thin space b s e c theta space equals space c rightwards double arrow a sin theta plus b equals c cos theta  U sin g space i d e n t i t i e s comma space sin theta equals fraction numerator 2 space tan begin display style theta over 2 end style over denominator 1 plus space tan squared theta over 2 end fraction comma space cos theta equals fraction numerator 1 minus space tan squared theta over 2 over denominator 1 plus space tan squared theta over 2 end fraction s u b s t i t u t e space t h e space a b o v e space v a l u e s space i n space g i v e n space e q u a t i o n. space w e space g e t space 2 a tan theta over 2 plus b open parentheses 1 plus space tan squared theta over 2 close parentheses equals c open parentheses 1 minus space tan squared theta over 2 close parentheses left parenthesis b plus c right parenthesis space space tan squared theta over 2 plus space 2 a tan theta over 2 plus b minus c equals 0  G i v e n space alpha comma beta space a r e space t h e space r o o t s comma space w e space g e t tan alpha over 2 plus tan beta over 2 equals fraction numerator minus 2 a over denominator b plus c end fraction tan alpha over 2 tan beta over 2 equals fraction numerator b minus c over denominator b plus c end fraction w e space h a v e space tan open parentheses alpha over 2 plus beta over 2 close parentheses equals fraction numerator tan alpha over 2 plus tan beta over 2 over denominator 1 minus tan alpha over 2 tan beta over 2 end fraction equals fraction numerator minus 2 a over denominator 2 c end fraction equals fraction numerator minus a over denominator c end fraction tan open parentheses alpha plus beta close parentheses equals tan 2 open parentheses fraction numerator alpha plus beta over denominator 2 end fraction close parentheses equals fraction numerator 2 cross times begin display style fraction numerator minus a over denominator c end fraction end style over denominator 1 minus begin display style a squared over c squared end style end fraction equals fraction numerator 2 a c over denominator a squared minus c squared end fraction H e n c e space P r o v e d

Thu July 24, 2014  

Ans: Dear ketanabc1998@gmail.com

Thanks for asking us a question in Ask the Expert section of TopperLearning.com.
The scope of this helpdesk is to answer subject related queries which are relevant to understanding concepts and solving problems. Hence we regret that we would not be able to answer your query.

Regards

Topperlearning Team.

Wed July 23, 2014  

Ans: Chemical reaction means formation of new compound not element – False A chemical reaction is the change of a substance into a new one that has a different chemical identity. There are chemical reactions in which elements get formed. For example: HgO(s) → 2Hg(l) + O 2 (g) 2Al(s) + Fe 2 O 3 (s) → Al 2 O 3 (s) + 2Fe(l)
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