CBSE > Class 09 > Science | CBSE Board | Homework Help

For positive works: Kicking a football Riding a bicycle For Negative works: Someone pushes you Pushing a car up a hill, when you slip back Sry I'm sure about zero work done

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Why work and energy are scaler quantities

Posted by Kiranjit Kaur Meet 7 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Aaditya Singh 7 years, 4 months ago

They have no direction

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Palak ?? 7 years, 4 months ago

Because they are dot product of two quantities

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Sakshi Bhadouriya 7 years, 4 months ago

Work has no direction

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Write the angle between force and displacement in case of +work, -work and zero work

Posted by Kiranjit Kaur Meet 7 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Aaditya Singh 7 years, 4 months ago

60 or30 degree in +work and 140 or160degree in -work

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Palak ?? 7 years, 4 months ago

Work done is zero when angle is 90 degree... Work done can be positive or negative in any of the Other angles

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What are the function of areolar tissue

Posted by N P 7 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Aaditya Singh 7 years, 4 months ago

It fills cavity inside the organ

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Awnish Verma 7 years, 4 months ago

Provide mechanical support and also helps in exchanging of gases

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How the plant cell withstand very dilute external media without bursting

Posted by Kavin Thangam 7 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Palak ?? 7 years, 4 months ago

Because they have a cell wall which protects them m from the the variations in the climate and and due to it is made up of cellulose it provides rigidity to the plant cell

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Sarika Kapur 7 years, 4 months ago

Because they have a cell wall . It is a tough membrane made up of cellulose.

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how the surface area and wind speed affect the rate of evapiraton ?Explian

Posted by Mhod Arman 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 4 months ago

We know that evaporation is a surface phenomena so more will be the surface area more will be B evaporation now now when wind blows it blows away the water vapours from the atmosphere so the humidity level is decrease hence more evaporation occurs therefore more is the wind speed more is evaporation

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Define Isbar

Posted by Jasnoor Singh 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Aaditya Singh 7 years, 4 months ago

Same mass no. Of different element but different atomic no.

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How do good animal husbandry practices benefit farmers

Posted by Alok Sharma 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Good animal husbandry practices increases the production of animal products. This inturn increases the profit of farmers.

Also it keeps their animal stocks healthy. Hence, time and effort need not be spent on nursing the sick animals and preventing other animals from falling sick.

Improved animal husbandry practices helps to meet the demands for milk, meat and eggs.

The animal-based farming practices are undertaken by Indian farmers alongwith agriculture as mixed farming. However, the progressive farmers take up one of these practices on commercial basis.

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Define is unit of current

Posted by Ritika Kharbanda 7 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Yogesh Kumar 7 years, 4 months ago

S I unit of current is ampere

1 A =charge/ time=1C/1s= 1C/s

Thus . 1ampre may br defined as the one coulomb charge flow through the conductor in one second.

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Shreya Roy 7 years, 4 months ago

Ampere.....hope it helps

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List the disease causes by causative agent

Posted by Abhishek Patel 7 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Explain the theory of JJ Thomson

Posted by Jai Panchal 7 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Aaditya Singh 7 years, 4 months ago

Theory of Rutherford said that there is lot of empty space inside the atom and the nucleus isVery hard present in middle of atom

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Aaditya Singh 7 years, 4 months ago

Theory of Jesus Samsung Sat and the electrons are invented in the positively charged space in equal magnitude of proton

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Jai Panchal 7 years, 4 months ago

Theory of Rutherford

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What is phallogeny

Posted by Avishek Vishwakarma 7 years, 4 months ago

CBSE > Class 09 > Science

0 answers

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Which unit is used to measure the power of the car engine

Posted by Avishek Vishwakarma 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Fahim Ansari 7 years, 4 months ago

I think cc

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What is tonoplast??

Posted by Akanksha Gavande 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Avishek Vishwakarma 7 years, 4 months ago

It is a membrane of vacuole which surround the cytoplasmic part of vacuole

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What is principle of prevention

Posted by Harkirat Singh 7 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What are colloblasts?

Posted by Rishu Anurag 7 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is maen by valance

Posted by Praveen Kumar 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Rishu Anurag 7 years, 4 months ago

Valence means outermost

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When we boil water it does not raise up but when we boil milk why did it raise up

Posted by Rahul Pandey 7 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Fahim Ansari 7 years, 4 months ago

Ya very good question

0Thank You

Palak ?? 7 years, 4 months ago

Because water is a homogenous mixture but milk is a heterogeneous mixture it consist of of fat in its upper most layer so when milk is boiled the fat come together to form a thin layer which you know as the cream and the water boiling inside the milk tends to come up inform of of of water vapours so these water vapours inflate that uppermost layer of malai so milk Rises up when it is boiled

1Thank You

Avishek Vishwakarma 7 years, 4 months ago

Good question

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What are chordates and non chordates?

Posted by Prashant Gautam 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Saloni Kumar 7 years, 4 months ago

Chordates are the organisms which have notochord such as the organisms belong to vertebrate phylum while non chordates are the organisms which don't have notochord(its long rod like structure that runs to the back of the animals and separates the nervous tissue from the gut) such phylum porifera to enchinodermata

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Why our body doesn't sink in water

Posted by Arman Khare 7 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Fahim Ansari 7 years, 4 months ago

Only dead body can't sink in water.

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Arman Khare 7 years, 4 months ago

Fjxjdiic

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Two girls each of weight 400N climb up a rope through a height of 8m.girl a takes 20s n girl b takes 50s to acomplish this task.what is the power expended by the girls

Posted by Nibha Prakash 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Pratibha Pandey 3 years, 3 months ago

Ok so lets take F=400N (given)(weight) s=8mtr (Given) so lets first find the work done= W=F.S W= 400x8 W=3200J Now lets calculate the powers P=Work done/Time P1= 3200/20 P1=1600W P2=3200/50 P2=640N

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What's the kepler's three laws of planetary revolution with diagram

Posted by Taniya Negi 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Miss Angel Barsha 7 years, 4 months ago

1st is Law of orbits 2nd is Law of Area 3rd is Law of periods

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What is genetically modified organism?

Posted by Palak Genius 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 4 months ago

Organisms which are combined genetically for example oil if We combine the breeds of a donkey and a Horse we get a genetically modified organism known as Mule

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Define cotyledons

Posted by Shreya Ragothaman 7 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Cotyledons are the seeds of a plant. The cotyledons or seeds of a plant are sometimes covered by fruits and flowers and in some plants the cotyledons are not covered and are exploited. Plant having one single cotyledon are called monocots and plants having two cotyledons are called dicots.

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Does law of gravitation obey newton's third law ?

Posted by Abhijith Krishna 7 years, 4 months ago

CBSE > Class 09 > Science