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  • Quadratic Equation

    Q

    take various values of x, some on the negative side and some on positive.
    Plot, y=xsquare-4x.
    take points when y=0 (x-axis).
    You will get, (0,0) and (4,0) as solutions.

    A
  • Phythagoras Theorem

    Q



    AD2 = AB2 – BD2 = AC2 – CD2
    So, AB2 – BD2 = AC2 – CD2 ….(i)
    Since, BD = 3CD
    BD + CD = BC
    3CD + CD = BC
    CD = BC/4
    BD = 3BC/4
    On putting the value of BD and Cd in eqn.(i) , we get
    AB2 – 9BC2/16 = AC2 – BC2/16
    AB2 – 8BC2/16 = AC2
    So, 2AB2 = 2AC2 + BC2.

    A
  • Polynomials

    Q

    5√x4∜x3∛x2√x
    = 5* x4/2 * x3/4 * x2/3 *x1/2
    = 5 x(4/2 + 3/4 + 2/3 + 1/2) �= 5 x(24 + 9 + 8 + 6)/12 = 5 x47/12


    A
  • Thermal power

    Q

    Burning Coal in a power plant produces a number of pollutants. Some of these pollutants are specific to the type of fuel or is part of the combustion process or related to the design and configuration of the plant. This article highlights the major pollutants discharged from the power plant.

    Carbon Dioxide (CO2)
    CO2 was thought of as a product of combustion and not as a pollutant. Kyoto protocol, effects of Green House gases and global warming issues have changed the way we look at CO2. CO2 has turned to be the major greenhouse gas. A fossil fuel power plant is the major contributor of CO2.

    One MJ of heat input produces 0.1 kg of CO2. The only way to eliminate CO2 is to capture it before leaving to atmosphere. After capturing it has to be stored permanently or sequestered. Commercially viable capture and sequestration systems are yet to be in place. Till such time the only way is to


    Improve the power plant efficiency so that the reduced coal consumption reduces CO2 per kwhr.
    Switch over from Fossil based energy sources to renewable sources like wind, solar or hydro power.
    Reduce Deforestation and increase Afforestation to absorb the excess CO2 produced.
    Sulphur Dioxide (SO2)
    This is a product of Combustion and depends on the amount of Sulfur in Coal.This is also referred to as SOx.

    Sulphur in Coal ranges for 0.1 % to 3.5% depending on type and rank. During combustion Sulfur combines with Oxygen to form SO2.

    Power plants are the largest emitters of SO2. In the presence of other gases SO2 forms Sulphuric acid and can precipitate down as acid rain leading to destruction of eco systems.

    Use of low Sulfur coals is the best ways to reduce the SO2 emissions. Desulphurisation plants downstream of the boilers also reduce emissions. Fluidized bed combustion of coal is another effective method to reduce SO2 emissions..


    Ash
    Ash is the residue after the combustion. A 500 MW coal fired power plant burning Coal with around 20 % Ash, collects ash to the tune of Two Million Tons in Five years. Cement plants may utilize a small portion of the ash. Disposing bulk of it on a long term basis can raise major environmental issues.

    Ash contains toxic elements that can percolate into the drinking water system.
    The wind, breach of dykes or ash spills can carry away the ash particles to surrounding areas causing harm to humans and vegetation.

    A
  • Q

    angiosperm is a plant of a large group that comprises those that have flowers and produce seeds enclosed within a carpel, including herbaceous plants, shrubs, grasses, and most trees.

    A
  • Q

    we have already discussed this question please go through the link

    https://www.learnnext.com/nganswers/ask-question/answer/What-are-alkynes/Organic-Chemistry/106134.htm

    A
  • Q

    we have alredy discussed this question please go through the link

    https://www.learnnext.com/nganswers/ask-question/answer/What-are-alkanes/Organic-Chemistry/106135.htm

    A
  • triangle

    Q

    Hi, please recheck your question. If you are saying that in a triangle, BC:CD = 1:4 then 'C' cannot be the mid point of BD.

    A
  • semiconductor

    Q

    Each has four valence electrons, but germanium will at a given temperature havemore free electrons and a higher conductivity. Silicon is by far the more widelyused semiconductor for electronics, partly because it can be used at much higher temperatures than germanium.

    A
  • The largest lizard

    Q

    The adult length of species within the suborder ranges from a few centimeters for chameleons such as Brookesia micra and geckos such as Sphaerodactylus ariasae to nearly 3 m (9.8 ft) in the case of the largest living varanid lizard, the Komodo dragon.
    The 
    Komodo dragon is the largest living species of lizard in the world, and this big animal is very dangerous with a deadly bite and will attack humans. Growing up to 10 ft, weighing up to 150 lbs an can live up to 30 years.

    A

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