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pl give me summary of ch. Sensory,attentional, and perceptual processes

Posted by Sunita Sharma (Mar 29, 2017 5:04 p.m.) (Question ID: 4594)

Momentum define 


Posted by Priyanka Poddar (Mar 29, 2017 12:59 p.m.) (Question ID: 4584)

please what is the  meaning of general and pricipal solution in trignometry.

Posted by Racheal Asamoah (Mar 29, 2017 8:26 a.m.) (Question ID: 4580)

how much below the surface of the earth does the acceleration due to gravity becomes 99% of its value at the earth's surface ? (radius of earth =6400km )

Posted by Prerna Pihu (Mar 27, 2017 5:02 p.m.) (Question ID: 4552)

Please provide answer of physical education sample papers 


Posted by DEEPAK Siloka (Mar 25, 2017 11:05 a.m.) (Question ID: 4498)

Drive the expression for viscous force acting on spherical body of radius r moving with velocity v through viscous liquid of coefficient of viscocityη Using dimensional analysis.


Posted by Innocent Geeta (Mar 24, 2017 11:19 p.m.) (Question ID: 4492)

Discus the variation of acceleration due to gravity with altitude . How does the expression modify when h<<R?

Posted by Innocent Geeta (Mar 24, 2017 11:03 p.m.) (Question ID: 4490)

  • Answers:
  • Ans. Let g be the value of acceleration due to gravity at the surface of earth and g' at a height h above the surface of earth. If the earth is considered as a sphere of homogeneous composition, then g at any point on the surface of the earth is given by:

    {tex}g = {GM\over R^2}{/tex}  …………(1)

    Where M mass of earth, R is radius of Earth.

    Now, we ll determine Value of g at the distance h from the surface of earth.

    Then distance b/w center of earth and point = (R+h)

    {tex}g' = {GM\over (R+h)^2}{/tex} ……………(2)

    divide eq (2) by (1)

    {tex}{g'\over g} ={ { GM\over (R+h)^2} \over {GM\over R^2}}{/tex}

    {tex}=> {g'\over g}= {R^2\over (R+h)^2}{/tex}

    {tex}=> {g'\over g}= {R^2\over R^2 (1+{h\over R})^2} {/tex}

    {tex}=> {g'\over g}= {1\over (1+{h\over R})^2}{/tex}

    {tex}=> {g'\over g}= {(1+{h\over R})^{-2}}{/tex}

    Expanding using Binomial Theorem and neglecting terms with higher power of R, we get

    {tex}=> {g'\over g}=(1-2{h\over R}){/tex}


    So, The value of acceleration due to gravity 'g' decreases with altitude 'h'.

    When h<< R then expression is

    {tex}=> {g'\over g}=(1-2h){/tex}


    Answered by Naveen Sharma (Mar 26, 2017 10:32 a.m.)
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Drive the expression for pressure of a gas in a container? using it relate kinetic energy with pressure?

Posted by Innocent Geeta (Mar 24, 2017 11 p.m.) (Question ID: 4489)

4 cards are drawn at a time from a pack of 52 cards find the probability of getting all the 4 cards of the same suit. 


Posted by Tanu Shree (Mar 24, 2017 8:17 a.m.) (Question ID: 4474)

Two parallel force of magnitude 4 and 6 newton are acting on a body placed at 4m apart. Resultant force will be

Posted by Deepak James (Mar 23, 2017 10:48 a.m.) (Question ID: 4435)

Fill in the blanks with little ,a little , the little, a few , few , the few

......... Day's rest is all that is needed.

Posted by Ishan Kumar (Mar 21, 2017 2:30 p.m.) (Question ID: 4331)

  • Answers:
  • Ans. Few days rest is all that is needed.


    Answered by Naveen Sharma (Mar 21, 2017 6:23 p.m.)
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Convert 144km/ hr to m/s?

Posted by Devidas gaude (Mar 20, 2017 8:05 p.m.) (Question ID: 4239)

  • Answers:
  • Ans. {tex}144Km/h = {144\times 1000\over 3600} = 40m/s{/tex}

    Answered by Naveen Sharma (Mar 20, 2017 8:28 p.m.)
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what is syn gas and how it is prepared nowdays

Posted by SHIVAM JAISWAL (Mar 20, 2017 1:07 a.m.) (Question ID: 4160)

Oxidation number of N in (NH4)2 SO4


Posted by fazil khan (Mar 19, 2017 12:40 p.m.) (Question ID: 4108)

Define gravition.

Posted by Vishal Kumar (Mar 19, 2017 9:20 a.m.) (Question ID: 4089)

Who founded c++

Posted by Mayank Malhotra (Mar 18, 2017 9:22 p.m.) (Question ID: 4075)

  • check out on internet


    Posted by Sidharth Thakur (Mar 18, 2017 9:30 p.m.)
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  • Bjarne stroustrup

    Answered by Ponmani s (Mar 19, 2017 10:36 a.m.)
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    Answered by sriraman P (Mar 18, 2017 9:47 p.m.)
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  • Dennis Ritchie

    Answered by Sidharth Thakur (Mar 18, 2017 9:31 p.m.)
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Carbon-14 decay with a half life of about 5,800 year. In a sample of bone, the ratio of carbon-14 to carbon-12 is found to be 1/4 of what it is in free air. This bone may belong to period about x centuries ago, where x is

Posted by ATHARVA KALE (Mar 18, 2017 5:05 p.m.) (Question ID: 4063)

Min. No. Of meiotic division required to produce 62 pollen grains 

Posted by Dr-Sachin Khatri (Mar 18, 2017 3:55 p.m.) (Question ID: 4061)

  • Answers:
  • In Meiotic division, each cell divides into 4 daughter cells. During pollen grain formation, pollen grain mother cell divides meiotically to proudce 4 cell tetrad that differente from each other to form 4 pollen grains. so, minium number of cell division required is 16.

    Answered by RAJENDRA SINGH (Mar 18, 2017 5:34 p.m.)
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Write an article for your school magazine on the topic unfair mean no the right way 

Posted by Rahul Chaurasiya (Mar 18, 2017 12:53 a.m.) (Question ID: 4035)

What is green chemistry

Posted by Khizer Ansari (Mar 17, 2017 9:11 p.m.) (Question ID: 4028)

  • Answers:
  • Ans. Green chemistry, also called sustainable chemistry, is an area of chemistry and chemical engineering focused on the designing of products and processes that minimize the use and generation of hazardous substances.

    Answered by Naveen Sharma (Mar 17, 2017 10 p.m.)
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Anything less than a complete structure of a cell does not ensure independent living. What does this statement means? 

Posted by Dr-Sachin Khatri (Mar 17, 2017 4:59 p.m.) (Question ID: 3993)

  • Answers:
  • All parts of cell have some function, independent living requires all these functions to be done accuretly. so, organisms having incomplete cellular structure will not survive.

    Answered by RAJENDRA SINGH (Mar 17, 2017 7:44 p.m.)
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Name the financial statement in which the balance of suspense account will be shown


Posted by Vishu Jaiz (Mar 17, 2017 2:03 p.m.) (Question ID: 3986)

Why  we take force are equal when we connect two springs in series ?

Posted by Vivek Kumar (Mar 17, 2017 1:08 p.m.) (Question ID: 3985)

You are given a cylinder once the cylinder rolled up to a inclined plane and the same cylinder is rolled down the same inclined plane.

Find direction of friction in both the cases

Posted by Vivek Kumar (Mar 17, 2017 11:19 a.m.) (Question ID: 3972)

  • Answers:
  • Ans. The direction of the frictional force will be up the inclined plane in both the motions.

    The friction acts opposite to the relative motion of the point of contact on ground. In both the cases the force acting on the point of cylinder in contact with the plane is {tex}mgSin\theta{/tex}.

    As there is pure rolling the velocity and acceleration of the point of contact must be zero. So friction acts upwards along the inclined plane.

    Answered by Naveen Sharma (Mar 17, 2017 12:37 p.m.)
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derive the equation Kp=Kc(RT)

Posted by jay patel (Mar 17, 2017 9:20 a.m.) (Question ID: 3967)

discuss the diagonal relationship between Be and Al

Posted by jay patel (Mar 17, 2017 9:18 a.m.) (Question ID: 3966)

  • Answers:
  • Ans. The ionic radius of Be2+ is estimated to be 31 pm : the charge/ radius ratio is nearly the same as that of the Al3+ ion. Hence beryllium resembles aluminium in some ways. Some of the similarities are:

    • Like aluminum, beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.
    • Beryllium hydroxide dissolves in excess of alkali to give a beryllate ion, just as aluminium hydroxide gives aluminate ion.
    • The chlorides of both beryllium and aluminium have Cl- bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong Lewis acids. They are used as Friedel Craft catalysts.
    • Beryllium and aluminium ions have strong tendency to form complexes.
    Answered by Naveen Sharma (Mar 17, 2017 9:46 a.m.)
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compare the structure of water molecule and ice?

Posted by jay patel (Mar 17, 2017 9:16 a.m.) (Question ID: 3965)

state and prove bernoullis threom?

Posted by prakhar tripathi (Mar 17, 2017 7:25 a.m.) (Question ID: 3960)

What range of activities business comprise of 

Posted by Mohammad Uzair (Mar 16, 2017 9:12 p.m.) (Question ID: 3949)

  • Answers:
  • Ans. Business include the following range of activities:

    1. Industry, i.e. production and related activities
    2. Commerce, i.e. trade and aides to trade
    Answered by Naveen Sharma (Mar 16, 2017 10:57 p.m.)
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What do you understand by quantitative and qualitative data? 

Posted by Sakshi Tyagi (Mar 16, 2017 8:51 p.m.) (Question ID: 3946)

  • Answers:
  • Ans. Quatitative data are anything that can be expressed as a number, or quantified. Examples of quantitative data are scores on achievement tests,number of hours of study, or weight of a subject. These data may berepresented by ordinal, interval or ratio scales and lend themselves to most statistical manipulation.

    Qualitative data cannot be expressed as a number. Data that represent nominal scales such as gender, socieo economic status, religious preference are usually considered to be qualitative data.

    Both types of data are valid types of measurement, and both are used in education journals. Only quantitative data can be analyzed statistically, and thus more rigorous assessments of the data are possible.

    Answered by Naveen Sharma (Mar 17, 2017 8:52 a.m.)
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