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

Time = 1.2 second
Initial velocity = 1.8m/sec
Final velocity = 4.2m/sec

Now,
Acceleration = final v - initial v/time
So,

So,
Acceleration = 2m/sec²

Mass (given) = 5.5 kg
Now,

So,
F= 5.5 * 2 = 11N

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Ram Sharma 4 years, 1 month ago

Flexibility in plants in due to

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ANSWER

What are balanced and unbalanced forces

Posted by Aarohi Srivastava 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Mithul J 4 years, 1 month ago

The forces acting on a body in opposite direction in which both the forces are equal and the resulting force on the body is zero. This is known as balanced force. Balanced forces don't change the motion or position of an object. The forces acting on a body in opposite direction in which one of the force is greater than the other,then the resulting force will not be zero. This is known as unbalanced force. Unbalanced forces change the motion or position of an object.

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*Suhana * 4 years, 1 month ago

Balanced forces are those two forces acting in opposite directions on an object, and they are equal in size. Unbalanced force: A force where two forces acting in opposing directions on a body, are not equal in magnitude and in size, is known as Unbalanced force.

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ANSWER

*How does an amoeba obtain it's food*

Posted by Jasleen Chhabra 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Amritangshu Ghosh 4 years, 1 month ago

Through Pseudopodia

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*Suhana * 4 years, 1 month ago

It obtain its food by the process of endocytosis.

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What is meant by syndrome

Posted by Udisha Singh Udisha Singh 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years, 1 month ago

A syndrome is a set of medical signs and symptoms which are correlated with each other and often associated with a particular disease or disorder.
When the functioning or the appearance of one or more systems of the body will change for the worse, it gives certain abnormal signs of the disease. These visual changes in human beings are called symptoms. Symptoms give indication of the presence of a particular disease.

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*Suhana * 4 years, 1 month ago

Syndrome is a set of medical signs and symptoms which are correlated with each other and often associated with a particular disease or disorder. A syndrome is not specific to only one disease.

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What is living things

Posted by Rethish Karri 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Sandeya Kazal Chettri 4 years, 1 month ago

Living things means which can move and grow its called living things? i am thinking like this???

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Yogita Ingle 4 years, 1 month ago

Living things exist and are alive and are made of microscopic structures called cells. They grow and exhibit movement or locomotion. They experience metabolism, which includes anabolic and catabolic reactions.

Living things are capable of producing a new life which is of their own kind through the process of reproduction. Living things have a particular life span and are not immortal.

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Rethish Karri 4 years, 1 month ago

The things that can move by their own are called living things

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Jogendr Baiga 4 years, 1 month ago

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How diffusion plays an important role in gaseous exchange between the cell as well as the cell and it's external environment short answer

Posted by Rohan Aryan 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Diffusion is an important process through which exchange of gases takes place in a cell. This process is mainly directed by the difference in pressure of concentration. Hence the gases move from a highly concentrated region to a region of low concentration. Diffusion in plant cells mainly takes place during the process of photosynthesis where carbon dioxide diffuses into plant cells via the stomata on the leaf.

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Why plasma membrane is called a selectively permeable membrane short answer

Posted by Rohan Aryan 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sayantika Malobika 4 years, 1 month ago

The plasma membrane is called a selectively permeable membrane as it allows the movement of certain particles/molecules in and out of the cell.It also acts as a barrier between the cell organelles and the external environment.

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ANSWER

Draw a velocity time graph to show the following motion .A car accelerates uniformly from rest for 5 seconds then it travel at a steady velocity for 5 second

Posted by Aditya Jha 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 3 years, 11 months ago

Initially the car moves under acceleration for 5 sec. So, the velocity-time graph has a slope in first 5 sec and then it moves at a constant speed. So, the curve will be a straight line parallel to time axis where the value of speed does not change.

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What is solution ?

Posted by Aaa - 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Prajal Chettri 4 years, 1 month ago

A solution is a homogeneous mixture of two or more substance on a single physical state

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ANSWER

What type of mixtures are seperated by the technique of crystallization and why

Posted by Student Stand 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 years, 1 month ago

A n s w e r:

Homogeneous mixtures such as common salt solution and copper sulphate solution separated by technique of crystallization.
"Crystallization is also a chemical solid-liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs."
Therefore, crystallization is used to separate a solid-liquid mixture.

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ANSWER

An object having 2.3 kg moving with a velocity 3.5 m/sec then find the momentum

Posted by Sowparnika Ram 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Rudrashrya Thappa 4 years, 1 month ago

8.05 kg m/s

3Thank You

Pradeep Mehta 4 years, 1 month ago

Momentum = mass x velocity P= 2.3kg. X. 3.5m/s =8.05kgm/s

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ANSWER

What is difference between knitic energy and potential enegy. Give examplea

Posted by Pradeep Mehta 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Rudra Seth 4 years, 1 month ago

Kinetic energy is the enengy of moving body but potential energy is the energy of charge bodies

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ANSWER

What was the main proposal of montreal protocol 1987

Posted by Pratheeksha Naik 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 years, 1 month ago

By the late 1970s, scientists were able to prove that chemical substances that were used in air conditioners, refrigerators and aerosol cans were causing damage to the ozone layer. In 1985, a huge hole was discovered in the ozone layer over Antarctica. This hole allowed hazardous levels of ultraviolet (UV) radiation to reach the earth’s surface.

The Vienna Convention for the Protection of the Ozone Layer was signed in 1985 under which UN member countries recognized the importance of curbing damage to the ozone layer. As per the Convention’s provisions, countries agreed to adopt the Montreal Protocol to further the goals of the Vienna Convention.

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What are Xylem and Phloem made up of?

Posted by Sayantika Malobika 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 years, 1 month ago

Xylem is a conducting tissue and constitute a vascular bundle. Xylem consists of tracheids, vessels, xylem parenchyma and xylem fibres.

Phloem is also a conducting tissue and constitutes a vascular bundle. Phloem is made up of four types of elements: sieve tubes, companion cells, phloem fibres and the phloem parenchyma.

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ANSWER

What is tissue. Explain

Posted by Pata Monalisha 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sakshi Singh 4 years, 1 month ago

In Biology tissues in cellular organizational level between cells and the complete organ or tissue is a ensemble of similar cells and their extracellular matrix from the same origin that together carry out a specific function organs are then formed by the functional grouping together of multiple tissues

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Gaurav Seth 4 years, 1 month ago

A group of cells that are similar in structure and work together to do a peculiar function is called tissue.

The types of simple tissues are parenchyma, collenchyma, sclerenchyma and aerenchyma.

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Ash Greninja 4 years, 1 month ago

A tissue is a formation of group of cells similar in size, function, shape. The tissues are the combined to form organ to perform a specific function in the human body.

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ANSWER

What is the displacement of a satellite when it make a complete round along its circular path

Posted by Anmol Kumar 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Mukul Kumar 😎 4 years, 1 month ago

Zero; because after making a complete round, the distance between the final position and the initial position will be zero.

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Parag Nagar 4 years, 1 month ago

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ANSWER

Who

Posted by Sanjay Gupta 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Suhani Rai 4 years, 1 month ago

World health organization

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Ash Greninja 4 years, 1 month ago

World Health Organization.

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Differentiate between uniform motion and nonuniform motion

Posted by Gaurang Chouhan 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Govind Agrawal 4 years, 1 month ago

UNIFORM MOTION When an object covers equal distance in equal interval of time it is said to be in uniform motion. NON UNIFORM MOTION When an object covers unequal distance in equal interval of time it is said to be in non uniform motion.

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Loomika Senthilkumar 8-B 4 years, 1 month ago

Easy explaination 1) equal distance in equal interval - uniform 2)e.g bus moving in a straight road - uniform 1) unequal distance equal intervals - non - uniform 2) e.g bus moving in a busy road - non - uniform

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Satwik Banerjee 4 years, 1 month ago

Uniform motion: when an obect covers equal distance in equal interval of time, known as uniform motion. 2. For example, a car moving in a straight road Non-uniform motion: when an object covers unequal distance in equal intervals of time, is known as non-uniform motion. 2. For example, a car moving through a busy road.

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ANSWER

HOW MANY ATOMS ARE PRESENT IN H2SO4.

Posted by Rohan Patil 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Vanshika Sharma 4 years, 1 month ago

4Thank You

Rohan Patil 4 years, 1 month ago

PLZ GIVE ME ANSWER.

4Thank You

ANSWER

What is the bhor's model of radon

Posted by Ayush Yadav 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Suraj Burnwal 4 years, 1 month ago

1) Electrons are revolving around the nucleus 2) Atoms has nucleus in the centre

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Who proposed the cell theory ?

Posted by Meghali Mandal 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Adarsh Bs 4 years, 1 month ago

SCHELIDEN AND SCHWAN PROPOSD CELL THEORY AND FURTHER EXPANDED BY VIRCHOW

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Ayush Yadav 4 years, 1 month ago

M. SCHELIDEN AND T. Schwan

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Farzan Abdul Rehman 4 years, 1 month ago

Theodor Schwann

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What is the difference between gravitation and gravity?

Posted by Sarita Panda 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sudev Subrahmanian 4 years, 1 month ago

Gravitational force is the force on whole i.e. that force which is exerted by every object in universe to other object... Gravity is the gravitational force exerted by the EARTH To conclude, gravitation is a term for the whole universe while gravity is a term refering to earth's gravitational force.

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What mean planning

Posted by Mathesh Harish 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Laya R 4 years, 1 month ago

The process of making plans for something mass production methods call for detailed planning

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Yogita Ingle 4 years, 1 month ago

Planning is ascertaining prior to what to do and how to do. It is one of the primary managerial duties. Before doing something, the manager must form an opinion on how to work on a specific job. Hence, planning is firmly correlated with discovery and creativity. But the manager would first have to set goals. Planning is an essential step what managers at all levels take. It needs holding on to the decisions since it includes selecting a choice from alternative ways of performance.

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What is unit of work?

Posted by Yorker King 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Shivani Singh 4 years, 1 month ago

Joule

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Yogita Ingle 4 years, 1 month ago

The SI unit of work is joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one meter. Sometimes, newton-metre (N-m) is also used for measuring work. However, as this unit is also used for torque it can get quite confusing.

SI unit	N.m	Joule
CGS unit	dyne-cm	Erg

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Nikita Negi 4 years, 1 month ago

Joule ( J )

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Mallareddy Kural 4 years, 1 month ago

Joule

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What is unit of force????? Please tell

Posted by Yorker King 4 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Shreya Panchal 4 years, 1 month ago

Newton

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Himanshu Singh 4 years, 1 month ago

Newton

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Sarita Panda 4 years, 1 month ago

Kgm/s² or N

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Mallareddy Kural 4 years, 1 month ago

Newton

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Swarupa Mishra 4 years, 1 month ago

SI unit of force is Newton

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Please tell me the name of deleted chapters of science ( pcb)

Posted by Nikita Negi 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Nikita Negi 4 years, 1 month ago

Thank you?

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Gaurav Seth 4 years, 1 month ago

HRD Minister Ramesh Nishank announced a major CBSE syllabus reduction for the new academic year 2020-21 on July 7 which was soon followed by an official notification by CBSE on the same.

Considering the loss of classroom teaching time due to the Covid-19 pandemic and lockdown, CBSE reduced the syllabus of classes 9 to 12 with the help of suggestions from NCERT.

<a aria-expanded="true" data-toggle="collapse" href="http://cbseacademic.nic.in/Revisedcurriculum_2021.html#collapse26">Curriculum Deduction Details (Deleted Portion only for the purpose of Annual Examination-2021)This has to be read along with the revised syllabus and also with the Alternative Calendar of NCERT</a>

<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDComputer_Application_Sec_2020-21.pdf" target="_blank">Deleted - Computer Application</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDEnglish_Sec_2020-21.pdf" target="_blank">Deleted - English - Language and Literature</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_A_Sec_2020-21.pdf" target="_blank">Deleted - Hindi A</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_B_Sec_2020-21.pdf" target="_blank">Deleted - Hindi B</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHome_Science_Sec_2020-21.pdf" target="_blank">Deleted - Home Science</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDMathematics_Sec_2020-21.pdf" target="_blank">Deleted - Mathematics</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDScience_Sec_2020-21.pdf" target="_blank">Deleted - Science</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDSocial_Science_Sec_2020-21.pdf" target="_blank">Deleted - Social Science</a>

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༄ᶦᶰᵈ᭄☞Rahulrohit࿐™?? ༄ᶦᶰᵈ᭄☞Sidramappa࿐™?? 4 years, 1 month ago

Znnzmanskajzh

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An atom. Has a atomic number12 what is its valency and name the element

Posted by Vidhi Kaushik 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Ayush Yadav 4 years, 1 month ago

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Shivani Singh 4 years, 1 month ago

Magnesium

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Swarupa Mishra 4 years, 1 month ago

Magnesium

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Yogita Ingle 4 years, 1 month ago

Element with atomic number 12 is Magnesium (Mg). Electronic configuration of magnesium is 1s2 2s2 2p6 3s2. It has 2 e- in its outermost orbit and can donate these to form a stable octet. Hence, its valency is +2.

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