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The gravitational constant g is given as: g=GM/R² or M= g*R²/G⇒Density D=mass/volume=g*R²/G*Ve (Where Ve is the volume of the earth ) D=g*R²/G*4/3πR³=3g/4πGR Hence, the average density of the earth in terms of g, G and R is 3g/4πGR

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Match the following:- Column I Column II 1 . Sodium a. Yellow in colour 2 . Helium b. Diatomic 3. Sulphur c . Soft metal 4. Hydrogen d. Noble gas

Posted by Suhani Rai 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Suhani Rai 4 years, 1 month ago

Sulphur - yellow in colour

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Suhani Rai 4 years, 1 month ago

Sodium -soft metal

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Suhani Rai 4 years, 1 month ago

Hydrogen - diatomic

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Suhani Rai 4 years, 1 month ago

Helium- noble gas

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what is acceleration produced by a force of 12 newton exerted on an object of mass 3kg

Posted by Dsouza Frewin 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Satyam Kumar 4 years, 1 month ago

4m/square

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Yogita Ingle 4 years, 1 month ago

Given that: F = 12N, m = 3Kg and a = ?

Therefore, using:

F = m(a)

a = F/m = 12/3 = 4 m/s²

Thus,

Acceleration of the body is = 4 m/s².

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Dsouza Frewin 4 years, 1 month ago

With formula

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Anyone please share the mind map for gravitation chapter pls send I have to complete my notes tomorrow is my exam

Posted by Khushi Arora 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Khushi Arora 4 years, 1 month ago

I don't know ☹️

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Maitri Sharma 4 years, 1 month ago

I will share but can you please tell how to share any Image here if you know

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What are the concept s which have be covered in gravitation

Posted by Khushi Arora 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Suhani Rai 4 years, 1 month ago

In physics, gravity is the natural force that causes things to fall toward the earth. The noun gravitycan also mean seriousness or solemnity.

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What is gravitation explain in brief

Posted by Khushi Arora 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Manoj Tomar 4 years, 1 month ago

The force attract one body to another is called gravitational force

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Suhani Rai 4 years, 1 month ago

In physics, gravity is the natural force that causes things to fall toward the earth. The noun gravitycan also mean seriousness or solemnity.

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Calculate molecular mass of following : carbon dioxide (CO2 )

Posted by Kirandeep Kaur Sidhu 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Satyam Kumar 4 years, 1 month ago

44u

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Pooja Pandiyan 4 years, 1 month ago

The molecular mass of carbon dioxide is 44.01amu. The molar mass of any compound is the mass in grams of one mole of that compound. One mole of carbon dioxide molecules has a mass of 44.01g, while one mole of sodium sulfide formula units has a mass of 78.04g. The molar masses are 44.01g/mol and 78.04g/mol

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What's is a law of motion

Posted by Utsak Singh 4 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Khushi Arora 4 years, 1 month ago

Law of motion is also known as the Newton's law of motion .,there are 3 laws of motion which is given by Newton:- 1.according to this law a body at rest will remain at rest and in motion will continue in a straight line 2. Rate of change of momentum of a body is directly proportional to the applied force and take place in direction in which the force act 3. according to this law of motion to every action there is an equal and opposite reaction .. hope this will help you .

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Tamanna Patel 4 years, 1 month ago

Sir Isaac Newton's three laws of motion describe the motion of massive bodies and how they interact. While Newton's laws may seem obvious to us today, more than three centuries ago they were considered revolutionary. Newton was one of the most influential scientists of all time. His ideas became the basis for modern physics. He built upon ideas put forth from the works of previous scientists including Galileo and Aristotle and was able to prove some ideas that had only been theories in the past. He studied optics, astronomy and math — he invented calculus. (German mathematician Gottfried Leibniz is also credited with developing it independently at about the same time.) Newton is perhaps best known for his work in studying gravity and the motion of planets. Urged on by astronomer Edmond Halley after admitting he had lost his proof of elliptical orbits a few years prior, Newton published his laws in 1687, in his seminal work "Philosophiæ Naturalis Principia Mathematica" (Mathematical Principles of Natural Philosophy) in which he formalized the description of how massive bodies move under the influence of external forces. In formulating his three laws, Newton simplified his treatment of massive bodies by considering them to be mathematical points with no size or rotation. This allowed him to ignore factors such as friction, air resistance, temperature, material properties, etc., and concentrate on phenomena that can be described solely in terms of mass, length and time. Consequently, the three laws cannot be used to describe precisely the behavior of large rigid or deformable objects; however, in many cases they provide suitably accurate approximations. Newton's laws pertain to the motion of massive bodies in an inertial reference frame, sometimes called a Newtonian reference frame, although Newton himself never described such a reference frame. An inertial reference frame can be described as a 3-dimensional coordinate system that is either stationary or in uniform linear motion., i.e., it is not accelerating or rotating. He found that motion within such an inertial reference frame could be described by three simple laws. The First Law of Motion states, "A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an external force." This simply means that things cannot start, stop, or change direction all by themselves. It takes some force acting on them from the outside to cause such a change. This property of massive bodies to resist changes in their state of motion is sometimes called inertia. The Second Law of Motion describes what happens to a massive body when it is acted upon by an external force. It states, "The force acting on an object is equal to the mass of that object times its acceleration." This is written in mathematical form as F = ma, where F is force, m is mass, and a is acceleration. The bold letters indicate that force and acceleration are vector quantities, which means they have both magnitude and direction. The force can be a single force, or it can be the vector sum of more than one force, which is the net force after all the forces are combined. When a constant force acts on a massive body, it causes it to accelerate, i.e., to change its velocity, at a constant rate. In the simplest case, a force applied to an object at rest causes it to accelerate in the direction of the force. However, if the object is already in motion, or if this situation is viewed from a moving reference frame, that body might appear to speed up, slow down, or change direction depending on the direction of the force and the directions that the object and reference frame are moving relative to each other. The Third Law of Motion states, "For every action, there is an equal and opposite reaction." This law describes what happens to a body when it exerts a force on another body. Forces always occur in pairs, so when one body pushes against another, the second body pushes back just as hard. For example, when you push a cart, the cart pushes back against you; when you pull on a rope, the rope pulls back against you; when gravity pulls you down against the ground, the ground pushes up against your feet; and when a rocket ignites its fuel behind it, the expanding exhaust gas pushes on the rocket causing it to accelerate. If one object is much, much more massive than the other, particularly in the case of the first object being anchored to the Earth, virtually all of the acceleration is imparted to the second object, and the acceleration of the first object can be safely ignored. For instance, if you were to throw a baseball to the west, you would not have to consider that you actually caused the rotation of the Earth to speed up ever so slightly while the ball was in the air. However, if you were standing on roller skates, and you threw a bowling ball forward, you would start moving backward at a noticeable speed. The three laws have been verified by countless experiments over the past three centuries, and they are still being widely used to this day to describe the kinds of objects and speeds that we encounter in everyday life. They form the foundation of what is now known as classical mechanics, which is the study of massive objects that are larger than the very small scales addressed by quantum mechanics and that are moving slower than the very high speeds addressed by relativistic mechanics. Additional resources HyperPhysics: Newton's Laws The Physics Classroom: Newton's Laws NASA: Newton's Laws of Motion RECENT NEWS Is the Y chromosome dying out? Coronavirus news of the week (VIDEO) Lab confirms first case of coronavirus reinfection in the U.S. Ad

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Md Zishan 4 years, 1 month ago

Land

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Yogita Ingle 4 years, 1 month ago

Newton gave three laws of motion that describe the motion of bodies. These laws are known as Newton's Laws of motion.
The first law of motion is stated as: An object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force.

The second law of motion states that: the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.

Newton's third law of motion states that: Whenever a body exerts a force on another body, the second body exerts an equal and opposite force on the first body

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Give four example of collidal solution??

Posted by Palak Pandey 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Khushi Arora 4 years, 1 month ago

Some examples of collodial solution are:- milk , shaving cream, butter, milk of magnesia,foam etc . Except this there were many examples of collodial solution. Hope this will help you!!

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Pradeep Mehta 4 years, 1 month ago

Milk , ink in water , smoke, face cream, clouds, sponge, foam, gemstone, shaving cream, milk of magnesia, smog, autimoblie exhaust,cheese, butter, jelly are examples of collid.

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Yogita Ingle 4 years, 1 month ago

Colloidal solutions, or colloidal suspensions, are nothing but a mixture in which the substances are regularly suspended in a fluid. A colloid is a very tiny and small material that is spread out uniformly all through another substance.
Sol, emulsion,foam and solid solution are the examples of colloidal solution.

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What are the different means by which infectious disease spread ?

Posted by K.Kaviya Ix A 9032 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Priyal Gupta 4 years, 1 month ago

Through food , through water , through vector , physical contact etc

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Arsh Tiwari 4 years, 1 month ago

sneezing physical contact spiting etc....

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ANSWER

What is disease ? How many types of disease have you studied ? Give examples

Posted by K.Kaviya Ix A 9032 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Any deviation from the normal functioning or state of incomplete physical or mental well being is called disease. Disease is a condition that impairs the proper functioning of the body or one of its parts. The diseases may be of different types, such as :
(a) Acute disease: Which lasts for short duration. Example: Common cold. jaundice
(b) Chronic disease: Which lasts for very long period. Example: Tuberculosis, diabetes.
(c) Infectious disease: Which can be transmitted from one individual to another directly or indirectly. Example: Influenza, tuberculosis
(d) Non-infectious disease: Which are not transmitted from one individual to another. Example: Cancer, marasmus.

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Differentiate between healthy and disease - free ?

Posted by K.Kaviya Ix A 9032 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Suhani Rai 4 years, 1 month ago

Difference Between Healthy and Disease Free Healthy Disease Free A state of complete physical, mental and social well being State of the absence of discomfort in any part of the body It depends upon the individual as well as on social and environmental factors It depends on the individual only A healthy person will be disease-free A disease-free person may or may not be healthy A healthy person is energetic and is able to perform as per the requirement The performance of a disease-free person depends upon the environment and personal attitude

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Yogita Ingle 4 years, 1 month ago

Healthy	Disease Free
A state of complete physical, mental and social well being	State of the absence of discomfort in any part of the body
It depends upon the individual as well as on social and environmental factors	It depends on the individual only
A healthy person will be disease-free	A disease-free person may or may not be healthy
A healthy person is energetic and is able to perform as per the requirement	The performance of a disease-free person depends upon the environment and personal attitude

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ANSWER

My name is harsh rathod

Posted by Daksha Vagadiya 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Muskan Mishra 4 years, 1 month ago

Then what will I do ???

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Sneha Kanak 4 years, 1 month ago

Bro

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Sneha Kanak 4 years, 1 month ago

Isme hmlog kya kre

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ANSWER

Phyisc chapter

Posted by Neha Singh Naina 4 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is an aqueous solution? Give examples

Posted by Prajwal Navadgi 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years, 1 month ago

An aqueous solution is a solution in which water is used as solvent. It is mostly shown in chemical equation by using (aq) symbol.

Example- When Sodium chloride salt is dissolved in water it is known as aqueous solution of NaCl.

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Arsh Tiwari 4 years, 1 month ago

the solution in which the solvent is water is called acqueous solution. eg- salt in water and sugar in water...

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Zinc atomic number

Posted by Gudimalla Likith 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Yerrabolu Chakradhar 4 years, 1 month ago

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Suhani Rai 4 years, 1 month ago

30 With the middling atomic number 30, it has five stable isotopes of atomic weight from the dominant zinc 64 to zinc 70, plus an extra 25 radioisotopes.

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Arsh Tiwari 4 years, 1 month ago

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Connective tissue connects, separated and support all the other types of tissues in the body

Posted by Sukriti Pandey 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Prabhash Kumar Choubey 4 years, 1 month ago

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ANSWER

Which muscles make up the heart??

Posted by Palak Pandey 4 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Sandeya Kazal Chettri 4 years, 1 month ago

Cardiac muscles make up the heart.

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Suhani Rai 4 years, 1 month ago

Cardiac muscles

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Divya Gupta 4 years, 1 month ago

Cardiac muscles

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Mahi Singh 4 years, 1 month ago

Cardiac Muscles

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Arsh Tiwari 4 years, 1 month ago

cardiac muscle

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ANSWER

Ch 2 science

Posted by Payal Kasana 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Arohi Kumar 4 years, 1 month ago

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Arsh Tiwari 4 years, 1 month ago

is matter around us pure..

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What is a suspension?give two example

Posted by Arvind Kumar Shah 4 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sneha Kanak 4 years, 1 month ago

A suspension is a heterogeneous mixture in which solid does not dissolve in liquid but solid spread throughout the liquid. For ex chalk water mixture, flour in water, muddy water, etc.

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Yogita Ingle 4 years, 1 month ago

A suspension is a heterogeneous mixture in which the small particles of a solid are spread throughout a liquid without dissolving it. The chalk powder in water, muddy water, wheat flour in water etc. sand in water are all examples of a suspension.

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Shruti Wonder 4 years, 1 month ago

A suspension is a heterogeneous mixture in which the solute particles do not dissolve but remain suspended throughout the bulk of the medium. Ex: Chalk & water, Sand & water.

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A bullet of mass 0.2 kg is fired from the gun with the mass of 2 kg if the velocity of the bullet is 150 metre per second then what is the total momentum of the gun and Bullet before firing and after firing .

Posted by Pradeep Mehta 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Let the recoil velocity of gun be V.

Mass of gun Mgun=2.0 kg

Mass of bullet Mbullet=0.2 kg

Velocity of bullet Vbullet=150 m/s

Initial momentum of the system Pi=0

Applying the conservation of linear momentum : Pf=Pi

Or M_gunV+M_bulletV_bullet=0

Or 2×V+0.2×150=0

2v +30=0
2v = -30

⟹ V=−15 m/s

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the spring balance X is attached to the spring balance Y . mass of 4 kg object is attached to the spring balance Y. so what are the readings on the X and Y.

Posted by Pradeep Mehta 4 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

a body of mass 10 kg is moving in a straight road with a constant velocity what are the external forces acting on it

Posted by Pradeep Mehta 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Maitri Sharma 4 years, 1 month ago

Hope It'll Help

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Maitri Sharma 4 years, 1 month ago

Frictional force, Gravitational force, Atmospheric pressure and Contact force

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a ball of mass 500 gram moving with a velocity of 5 metre per second rebounds after striking a wall with the same velocity of 5 metre per second and 0.1 second find the force exerted by the wall

Posted by Pradeep Mehta 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Pradeep Mehta 4 years, 1 month ago

Plz write solution

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Explain plant tissue parts in brief

Posted by Khushi Arora 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Arsh Tiwari 4 years, 1 month ago

this is full concept of plant tissue...

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Arsh Tiwari 4 years, 1 month ago

the tissue present in plants are called plant tissue. plant tissue is of two types. (i) meristematic tissue. (ii) permanent tissue. * meristematic tissue are those tissue in which growth is not completed.they still have the ability to divide cells. these are also of 3 type. 1.apical-present at the apex of plant stem help to grow in lenght. 2.lateral-helps to increase widht of stem 3.intercalary-present between nodes of plant stem. *permanent tissue - those tisaue in which growth is completed and evovled from meristematic. they have loose their ability of diving cells. these are of two types 1.simple permanent tissue 2.complex permanent tissue 1.simple permanent - such type of permanent tissue which is made up of only one type of cell. they are of 4 type- 1.parenchyma 2.collenchyma 3.sclerenchyma 4.guard cell/epidermis 2.complex permanent tissue- such type of cell made up of many type of cell. these are of two types- 1. xylem. 2.pholem. I hope this will help you...

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Explain animal tissue in short and it's types

Posted by Khushi Arora 4 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Suhani Rai 4 years, 1 month ago

There are four types of tissuesfound in animals: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. In this lab you will learn the major characteristics of each tissue and examine various types of eachtissue under the microscope.

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Yogita Ingle 4 years, 1 month ago

On the basis of the structure of cells and their function, animal tissues are classified into four major types:

Epithelial Tissue
Muscular Tissue
Nervous Tissue
Connective Tissue

Epithelial Tissue:

The covering or protective tissues in the animal body are animal tissues.
The cells of this tissue are tightly packed and it forms continuous sheet. Indeed cells of epithelium contain very little or no intercellular matrix.
The skin and lining of buccal cavity, blood vessels, alveoli of lungs and kidney tubules are made of epithelial tissue.
Epithelial cells lie on a delicate non-cellular basement membrane which contains a special form of matrix protein, called collagen.

Muscular tissue:

Muscular tissue constitutes all the muscles of the body of an animal.
Muscle cells are elongated and large sized, so they are called muscle fibres.
Muscle cells are typically arranged in parallel arrangement allowing them to work together effectively.
This tissue is responsible for movement in our body. Muscles contain special proteins called contractile proteins, which contract and relax to cause movement.
On the basis of their location, structure and function, there are following three types of muscle fibers:
1. Striated muscles (stripped, skeletal or voluntary muscles)
2. Smooth muscles (unstriated, visceral or involuntary muscles)
3. Cardiac muscles

Nervous tissue:

A tissue which is specialized to transmit messages in our body is nervous tissue. Brain, spinal cord and nerves are all composed of nervous tissue.
Nervous tissue contains highly specialized unit cells called nerve cells or neurons.
These cells are specialized for the conduction of impulse over great distance at great speed.
A neuron consists of a cell body (cyton or soma) with a nucleus and cytoplasm, from which long thin hair- like parts arise called dendrons.
Dendrons further branched out to form dendrites. From the distal part of cyton arises a very long process called axon.

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Difference between dicotyledons and monocotyledons?

Posted by Palak Pandey 4 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 1 month ago

Monocotyledon	Dicotyledon
The monocot embryos have a single cotyledon	The dicot embryos have a pair of cotyledons
They have a fibrous root system	They have a tap root system
Leaves in monocots have parallel venation	Leaves in dicots have reticulate or net venation
In monocot flowers, the count of parts of the flower is a multiple of three or equal to three	The count of parts in a dicot flower is a multiple of four or five or equal to four or five
The roots and stems of Monocotyledons does not possess a cambium and cannot increase in diameter	The roots and stems of Dicotyledons possess a cambium and have the ability to increase in diameter.
A few examples of monocotyledons are garlic, onions, wheat, corn and grass	A few examples of dicots are beans, cauliflower, apples and pear