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    • Posted by Jatin Kumar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Gaurav Seth 7 years, 2 months ago

    <header data-role="header" data-sticky="true" id="header"> <header data-role="header" data-sticky="true" id="header">

    The acceleration due to gravity is given by,

    </header>

    g = GM/R2

    </header>

    Where, M is the mass of the planet or satellite where ‘g’ is to be found and R is its radius.

    For Moon,

    Mm = 7.36 × 1022 kg

    Rm = 1.74 × 106 m

    So, gm = GMm/Rm2

    For earth,

    Me = 5.98 × 1024 kg

    Re = 6.37 × 106 m

    So,

    ge = GMe/Re2

    Now,

    gm/ge = (Mm Re2)( Me Rm2)

    Plugging in the values we get,

    gm/ge = 0.16

    => ge = gm/0.16 ≈ 6gm

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    • Posted by Ayush Nagarkoti 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Ayush Nagarkoti 7 years, 2 months ago

    Thank you

    0Thank You

    Aman Anshuman 7 years, 2 months ago

    Hence, nitrification and denitrification are two important stages of the nitrogen cycle. Nitrification is the biological conversion of ammonium into nitrate. Denitrification is the biological conversion of nitrate into nitrogen gas. This is the main difference between nitrification and denitrification.

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    • Posted by Pratik Jadhav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Aman Anshuman 7 years, 2 months ago

    m /s

    0Thank You

    Pratik Jadhav 7 years, 2 months ago

    m/s

    0Thank You

    ANSWER

    • Posted by Saahil Khanna 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Mohith Pranav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    Longitudnal waves travel in the form of compression and rarefactions. In the waves the individual particles of the medium move in a direction parallel to the direction of the propagation of the distirbance. The particles do not move from one place to another but they simply oscillate back and forth about their position of rest. This is exactly how a sound wave propagates. Hence, sound waves are longitudnal waves.

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    • Posted by Mohith Pranav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    The cork cells were the first cells to be observed. They were composed of box-like compartments, forming a honeycomb structure. Cell organelles are found embedded in the cytoplasm.These are smaller in size and bounded by plasma membrane.

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    • Posted by Aswin Ganesh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Jatin Mehta 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Mrinal Kanti Das 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    Micronutrients

    Macronutrients

    Required in minute quantities.

    Required in large quantities.

    Play a pivotal role in disease prevention.

    Play a pivotal role in providing energy.

    Deficiency of micronutrients can cause Anaemia, Scurvy, Goitre, etc.

    Deficiency of macronutrients can cause protein-energy malnutrition, Kwashiorkor, marasmus, etc.

    Excessive intake of Vitamins harms the liver, mild nerve damage, etc.

    Excessive intake of macronutrients results in cardiovascular disease, obesity, diabetes, etc.

    Antioxidants, Minerals, and Vitamins are examples of macronutrients.

    Proteins, fiber, carbohydrates, and fats are examples of micronutrients.

    Micronutrients are mainly obtained from vegetables, fruits, cashews, eggs, all dairy products, etc.

    Macronutrients are mainly obtained from legumes, beans, pulses, soy, tofu, cereals, potatoes, fish as nuts, oilseeds, milk, cheese, etc.

    1Thank You

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    • Posted by Divyansh Sharma 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    From equations of motion, the relation connecting the initial velocity (u) and final velocity (v) of an object moving with a uniform acceleration a, and the displacement, s is  
    But from Newton’s second law of motion F = m a.
    work done by the force, F is written as the following:
    W = ma (v2 -u2)/2a
    ⇒ W = 1/2 m(v2 -u2)
    If the object is starting from its stationary position, that is, u = 0, then
    W = 1/2 m (v2 -02)
    ⇒ W = 1/2 mv2
    From work and energy theorem, work done is equal to the change in the kinetic energy of the object.
     w = (1/2) mv 2
    If u = 0, the work done will be,
    Thus the kinetic energy possessed by an object of mass, m and moving with a uniform velocity, v is
     K.E = (1/2) mv 2

    2Thank You

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    • Posted by Rubal Brar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Rubal Brar 7 years, 2 months ago

    Its physical state of matter is liquid i.e. 25degree... If its boiling point is below the room temperature its state is gas

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    • Posted by V S 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Manvendra Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Vanshika Parmar 7 years, 2 months ago

    Average power is the average amount of work done or energy transfered per unit time

    1Thank You

    Karan Yadav 7 years, 2 months ago

    Total work done ÷Total time taken

    1Thank You

    ANSWER

    • Posted by Deepak Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Vanshika Parmar 7 years, 2 months ago

    At equator minimum and at poles maximum

    1Thank You

    Filmy Wap 7 years, 2 months ago

    Maximum is on the surface of earth and minimum is at the center of the Earth.

    0Thank You

    Karan Yadav 7 years, 2 months ago

    Maximum at the poles Minimum at the equator

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    • Posted by Shikhar Yadav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Aman Anshuman 7 years, 2 months ago

    The force of gravity, pulled this molten material inwards towards the planet's center into the shape of a sphere. Later, when the planets cooled, they stayed spherical. Planets are not perfectly spherical because they also spin.

    1Thank You

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    • Posted by Shikhar Yadav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Aman Anshuman 7 years, 2 months ago

    A cell is made of molecules and a molecule is made of atoms. That's the simplest way of putting it. More complicated is that a cell is made up of macromolecules, such as proteins, lipids, etc. A molecule is a particular configuration of atoms.

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    • Posted by Shikhar Yadav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Karan Yadav 7 years, 2 months ago

    Earlier when planets started forming they were in molten state.Hence the centre was pulling the molten lava towards it . So because of this movement they became spherical and then they cooled down hence they attained a permanent shape.

    0Thank You

    Aman Anshuman 7 years, 2 months ago

    Actually they are in the shape of oblet speroid .

    0Thank You

    Najiya Parween 7 years, 2 months ago

    It is elliptical which have two focus

    0Thank You

    Surbhi Maheshwari 7 years, 2 months ago

    Actually they are not circular

    1Thank You

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    • Posted by Prerak Shah 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Karan Yadav 7 years, 2 months ago

    Bilaterally symmetrical Triploblastic Coelomate 4 chambered heart Respiration through lungs Bones hollow Limbs adapted to wings for flight

    1Thank You

    Shreya Dixit 7 years, 2 months ago

    Exoskeleton is of feathers Lay eggs outside the water 4 chambered heart Warm blooded Flight is possible Respire through Lungs Hope you liked my answer For better understanding consult NCERT class 9 chapter 7

    2Thank You

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    • Posted by Neha Verma 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Abhishek Raj 7 years, 2 months ago

    Because the waves in which the medium particles vibrates along a straight line parallel to the direction of wave propagation hence sound waves are longitudinal waves...

    2Thank You

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    • Posted by Najiya Parween 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Sahib Chaudhary 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Akanksha Kumari? 7 years, 2 months ago

    Mass no. = no. Of protons + no. Of neutrons

    3Thank You

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    • Posted by Ritu Rai 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Chaitanya Bhamare 7 years, 2 months ago

    Yes, it will be begative because it is in opposite diraction of gravity so,gravity=-g

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    • Posted by Vandna Vandu 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Chaitanya Bhamare 7 years, 2 months ago

    Ensure the precautions

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    • Posted by Adeel Hussain 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Akanksha Kumari? 7 years, 2 months ago

    Antibiotics are drug type substance which help to fight bacterial infections.

    1Thank You

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    • Posted by Akanksha Kumari? 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    1 mole of a substance is equal to its atomic mass or molecular mass expressed in grams. The atomic mass expressed in grams is the gram atomic mass. The molecular mass expressed in grams is the gram molecular mass.

    For example, The atomic mass of sodium is 23 grams.

    Therefore, 23 grams of sodium is equal to one mole of sodium atoms.

    Similarly, the molecular mass of oxygen (O2) =  2 × Atomic mass of oxygen

    = 2 × 16

    = 32 g

    Avogadro experimentally found that one mole of any substance always contained 6.022 × 1023 particles.

    This number is called the Avogadro’s number, denoted by N0.

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    • Posted by Sahil Dhingiya 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shreya Dixit 7 years, 2 months ago

    When a large no. of big rocks and stones gets crushed due to withering forms soil.

    2Thank You

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    • Posted by Saahil Khanna 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Bhawna Gupta 7 years, 2 months ago

    The biggest thing is Herculescorona.

    2Thank You

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    • Posted by Prem Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Chaitanya Bhamare 7 years, 2 months ago

    Suspension is suspension

    0Thank You

    Bhawna Gupta 7 years, 2 months ago

    No that's worng

    1Thank You

    Bhawna Gupta 7 years, 2 months ago

    A suspenaion is a heterogeneous mixture in which the small particles of a solid are spread throughout a liquid without dissolving in it...

    1Thank You

    Heet Lodha 5 years, 11 months ago

    Suspension means no halling no dulling

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    • Posted by Saahil Khanna 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Tanya Kant 7 years, 2 months ago

    Benjamin Franklin

    1Thank You

    Heet Lodha 5 years, 11 months ago

    I because i am elctrician

    0Thank You

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    • Posted by Saahil Khanna 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Abhishek Raj 7 years, 2 months ago

    Mercury is the smallest planet and Jupiter is the biggest planet

    0Thank You

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