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First law=A body continues its state of rest or of uniform motion in a straight line unless an external acts on it. Second law=the rate of change Of momentum of a body is directly proportinal to force applied

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What do you obtained from Newton first and second law

Posted by Jyoti Vishwakarma 7 years ago

CBSE > Class 09 > Science

2 answers

Samriddhi Sharma 7 years ago

Newtons first law defines inertia that is the inabilitiy of abody to change its state of rest or motion and hence it is also called law of inertia Whereas From Newtons second law of motion we can derive the formula of force i.e. F=m*a .

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Nisha Gupta 7 years ago

From newton first law we get defination of force and concept of inertia

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Difference between plant cell and alnimal cell

Posted by Venkates Waran 7 years ago

CBSE > Class 09 > Science

1 answers

Devendra 10 7 years ago

plant cell- cell wall is present,plastids are present,having definete shape Animal cell-cell wall is absent,plastids are absent,do not have definite shape I think it will help you?

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A pair of bullocks exerts a force of 140N on a plough . The field being ploughed is 15m long. How much work is done in ploughing the length of the field.

Posted by Venkates Waran 7 years ago

CBSE > Class 09 > Science

2 answers

Danush Kumar 7 years ago

As we all know, Work=force* displacement W=140* 15=2100 Work done = 2100 joules

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Samriddhi Sharma 7 years ago

As we know Work = force * displacement Work = 140*15 Answer =2100joules

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What is cotlydone?

Posted by Hrushikesh Sahu 7 years ago

CBSE > Class 09 > Science

1 answers

Arya Magade 7 years ago

Cotyledons are seed leaves present outside the seed in which the embryo is present

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How do ameba obtain its food

Posted by Sunita Sharma 7 years ago

CBSE > Class 09 > Science

4 answers

Danush Kumar 7 years ago

Amoeba takes the required materials by osmosis

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Jay Joshi 7 years ago

Amoeba obtain its food by the process ofpseudopodia

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Nidhi Singh 7 years ago

amoeba obtain its food by the process of endocytosis.

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Simarjot Kaur 7 years ago

Through vacuole

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Name the method used for the sepration of following mixture (a) benzine (80'C) and toluene (110'C) and (b) hydrated copper sulphate from its aqueous solution

Posted by Aarti Sheoran 7 years ago

CBSE > Class 09 > Science

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Atomic number of sodium is 11 and mass number is 32 what type of iron will be formed by it represent symbolically calculate the number of protons neutrons and electrons present in the joined from .what is the valency of sodium

Posted by Palashjyoti Kumar 7 years ago

CBSE > Class 09 > Science

1 answers

Ayush Nigam 7 years ago

Proton =16 Neutron=16 Valency =2,8,1

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write the atomic mass of proton and neutron?

Posted by Preet Walia 7 years ago

CBSE > Class 09 > Science

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Name the pathogen for AIDS

Posted by Simarjot Kaur 7 years ago

CBSE > Class 09 > Science

2 answers

Gaurav Seth 7 years ago

human immunodeficiency virus

AIDS (acquired immune deficiency syndrome) was first recognized in North America in the early 1980s. It is caused by a virus known as HIV (human immunodeficiency virus).

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Preet Walia 7 years ago

It is caused by a virus known as HIV (human immunodeficiency virus). HIV infection has become a worldwide epidemic ..

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A person is standing from 20 minutes with havey wheat on his head . does he do any work or not ? Explain?

Posted by Preet Walia 7 years ago

CBSE > Class 09 > Science

3 answers

Vikas Yadav Bahubali 7 years ago

Because at the head there the angle of 90 degree of thita so the thita value is always 0 at 90 so the work done is also 0

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Ayush Nigam 7 years ago

Because no displacement

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Prerak Gautam 7 years ago

no becouse distance travel=0 work done=force×distance work done=force×0 work done=0

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Which separation technique would you use to separate fine mud particles suspended in water??.. plzz answer this quickly.. i am confused between centrifugation , using alum , sedimentation?????

Posted by Pankhuee Dubey 7 years ago

CBSE > Class 09 > Science

6 answers

Pankhuee Dubey 7 years ago

Ooh sorry

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Khiladi Bhai 7 years ago

Today is sunday

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Sehrawat Sahab 7 years ago

An Alum is a type of chemical compound, usually a hydrated double sulphate salt of aluminium

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Sehrawat Sahab 7 years ago

Alum will sublimated in air on heating

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Pankhuee Dubey 7 years ago

What is alum??

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Abhyanand 7 years ago

Use to separate mud particles in water by sedimentation

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A gas jar containing air is inverted over another jar containing reddish brown vapours of bromine. After some time reddish brown colour is seen in the inverted gas jar too. Identify the henomenon associated with this observation.

Posted by 2 Boss 7 years ago

CBSE > Class 09 > Science

1 answers

Sehrawat Sahab 7 years ago

It is because of diffusion. The particles from one jar diffuses to another jar and get mixed with particles of first jar

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What is membrane biogenisis??

Posted by Ayush Nigam 7 years ago

CBSE > Class 09 > Science

1 answers

Ayush Nigam 7 years ago

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Derive s=ut+1/2at^2

Posted by Vipin Kumar 7 years ago

CBSE > Class 09 > Science

1 answers

Sehrawat Sahab 7 years ago

S = area of rectangle +area of triangle S=OA *OC +1/2 AD *BD We know that BD =AT Then, OA =u (initial) OC =time AD =time And BD =AT Then according to this S= U * T +1/2 *T*AT S=UT +1/2 At^2

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Define Fluid and buoyant force

Posted by Shyam Bihari 7 years ago

CBSE > Class 09 > Science

3 answers

Sehrawat Sahab 7 years ago

The upward force acting on an object immersed in a liquid is called buoyant force

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Abhyanand 7 years ago

Air and water called fluid

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Vipin Kumar 7 years ago

The upward force exterted on water is known as buoyant force

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A lamp consumes 1000 joule of electrical energy in 20 seconds what it its power

Posted by Shyam Bihari 7 years ago

CBSE > Class 09 > Science

1 answers

Vipin Kumar 7 years ago

2 joules/ sec

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KE = 1/2 mv²

Posted by Anurag Agrahari 7 years ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Consider an object of mass, m moving with a uniform velocity, u. Let it now be displaced through a distance s when a constant force, F acts on it in the direction of its displacement. Work done, W is F s. The work done on the object will cause a change in its velocity. Let its velocity change from u to v. Let a be the acceleration produced. 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 v² – u² = 2a s

This gives

s = v² – u² /2a

Thus, work done by force F

= m a x (v² – u² /2a )

Or ½ m (v² – u²)

If the object is starting from its stationary position, that is, u = 0, then

W = ½ mv²

Therefore, work done is equal to the change in the kinetic energy of an object.

If u = 0, the work done will be ½ mv².

Thus, the kinetic energy possessed by an object of mass, m and moving with a uniform

velocity, v is

E_k = ½ mv²

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Defferent between warm blooded and cold blooded

Posted by Khushi Agarwal 7 years ago

CBSE > Class 09 > Science

1 answers

Sehrawat Sahab 7 years ago

Cold blooded means the organisms which can change their body temperature according to climate. Warm blooded means which can not change their body temperature they have to adopt other methods, for example humans.

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Differentiate between 1-cathode and cation 2-anode and athode

Posted by Khiladi Bhai 7 years ago

CBSE > Class 09 > Science