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Kavanpreet Kaur 4 years, 2 months ago

Let the mass of earth = M. Let the mass of the object = m. Distance between the the earth's centre and object = Radius of the earth = R. Therefore, Gravitational Force = F = GMm/ R 2

Yogita Ingle 4 years, 2 months ago

Let the mass of earth = M.
Let the mass of the object = m.
Distance between the the earth's centre and object = Radius of the earth = R.
Therefore,
Gravitational Force = F = GMm/ R ²

ANSWER

what is Inverse square law.

Posted by Anshul Kumari 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 2 months ago

Inverse Square Law says that the strength of light (intensity) is proportional inversely to the square of the distance.

Inverse Square Law Formula is articulated as

I ∝ 1/d²

Where the distance is d, the intensity of the radiation is I.

ANSWER

Define and derive universal law of gravitation

Posted by K Kaviya 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 2 months ago

According to the universal law of gravitation, every object in the universe attracts every other object with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them. The direction of force is along the line joining the centres of the two bodies.

This law was given by Sir Isaac Newton.

Suppose two bodies A and B of masses M and m are lying at a distance d from each other. Let the force of attraction between these two bodies be F. according to the universal law of gravitation;

The force between the two bodies is directly proportional to the product of their masses.

F ∝ M × m

The force between the two bodies is inversely proportional to the square of the distance between them.

F ∝ 1/d²

Combining both the equations:

F ∝ M x m/d²

Or F = G M x m/d² i.

where G is the constant of proportionality and is called the universal gravitation constant.

By multiplying crosswise we get

F × d² = G M × m

Or G = F d²/ M x m

The SI unit of G can be obtained by substituting the units of force, distance and mass as N m² kg ^–2.

The value of G was found out by Henry Cavendish (1731 – 1810). The accepted value of G is 6.673 × 10^–11 N m² kg^–2.

ANSWER

Why do we like our sister

Posted by Dhruv Khandelwal 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Manthan Kadam 4 years, 2 months ago

Because they cares about us.

Aishwarya Satish 4 years, 2 months ago

She is your best friend

K Kaviya 4 years, 2 months ago

Because she is the another mother for us

Deva Dharshini 4 years, 2 months ago

I don't like them

Dhruv Khandelwal 4 years, 2 months ago

U fool we don't like them ??

ANSWER

Which process is convert light energy into chemical energy

Posted by Prince Maurya 4 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Aswath Gokul 4 years, 2 months ago

Photosynthesis

Yogita Ingle 4 years, 2 months ago

Photosynthesis is a process used by plants and other organisms to convert light energy, normally from the sun, into chemical energy, that can be later released to fuel the organisms' activities. It mainly takes place in two steps, light reaction, and dark reaction. Light reaction is mainly used to produce ATP and NADPH2 which is used during carbon dioxide fixation during the dark reaction.

ANSWER

Who is W.Wattson

Posted by Prince Maurya 4 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Madhusmita Sahu 4 years, 2 months ago

I think this question is from history ???

Madhusmita Sahu 4 years, 2 months ago

A person

Dhruv Khandelwal 4 years, 2 months ago

Human ??

ANSWER

Give four examples of non-uniform circular motion.

Posted by Trishla Jain 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Trishla Jain 4 years, 2 months ago

Hii Yogita Ingle Fan is doing rotatory motion not circular motion

Trishla Jain 4 years, 2 months ago

Thanku all of u

Dhawal Khatri 4 years, 2 months ago

Hello trishla

Yogita Ingle 4 years, 2 months ago

Four examples of non-uniform circular motion.

Fan
tires of a car

Shree Kushwaha 4 years, 2 months ago

Examples of non- uniform circular motions are : Oscillation of pendulum , the motion of a train, a person jogging in the park , hour hands of a watch

ANSWER

hghg

Posted by Ronak Gupta 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Mehbub Tahmim Ahmed 4 years, 2 months ago

A high gain harmonic generation (HGHG) FEL can provide high- power radiation with a full transverse and longitudinal coherence and a shorter and undulations than a conventional SASE FEL wherein the radiation starts from noise.???️ Stay safe .jai hind ??.

ANSWER

A body starts to slide over a horizontal surface with an initial velocity decrease at the rate of 0.5m/s . How much time will it take for the body to stop

Posted by Gayatri Rajbhar 4 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Dhawal Khatri 4 years, 2 months ago

Hello Gayatri

Suzanne Smitha 4 years, 2 months ago

If the system is under the application of friction force and no other force is applying on it then by using equation of linear motion v = u + at Here, v = 0.5 m/s , u =0 m/s and a = 0.5 m/s^2( acceleration is positive because it is in the direction of external force), then we have 0.5 =0 + 0.5t => t = 1 second

ANSWER

A moving train is brought to rest within 20s by applying brakes .find the initial velocity if the retardation due to brakes is 2m/s².

Posted by Gayatri Rajbhar 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jiya ??? 4 years, 2 months ago

Answer is 40m/s By using 1st equation of motion v=u+at

ANSWER

A bus decrease it's speed from 80km h-¹ to 60km h-¹ in 5 s.find the acceleration of the bus

Posted by Gayatri Rajbhar 4 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Suzanne Smitha 4 years, 2 months ago

Given: u=80 km/h = 200/9 m/s v=60 km/h = 150/9 m/s t=5 sec Acceleration=v-u÷t (150/9 - 200/9 )÷ 5 -50/(9×5) -10/9 -1.11 m/s So here acceleration= -1.11 m/s Or retardation = 1.11 m/s

Devansh Tyagi 4 years, 2 months ago

Initial velocity -80km/h Final velocity -60km/h Time-5sec V=u+at 60=80+5×a 60-80=5a -20=5a -20÷5=a a=-4/metre per second

Gaurav Seth 4 years, 2 months ago

U= initial velocity= 80 km/h = 22.2 m/s
v= final velocity = 60 km/h = 16.7 m/s
t= time = 5 s
a= acceleration = ?

a=v-u/t
a= 16.7-22.2/5
a= -5.5/5
Therefore, a=-1.1 m/s^2

ANSWER

Explain with activity change of state of matter.

Posted by Ekta Kumari 4 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Jasmine Kaur 4 years, 2 months ago

A change of state is a physical change in a matter. They are reversible changes and do not involve any changes in the chemical makeup of the matter. Common changes of the state include melting, freezing, sublimation, deposition, condensation, and vaporization

Yogita Ingle 4 years, 2 months ago

On increase in temperature ice changes into water. On further increase in temperature water changes into vapor.

Ice → Water → Vapour

On decrease in temperature vapor changes into water. On further decrease in temperature water changes into ice.

Vapour → Water → Ice

ANSWER

Kaun kaun sa chapter delete ho gya hai science me ??

Posted by Hanshika (Honey) 4 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Devansh Tiwari 4 years, 2 months ago

Who are you Dhairya Khandelwal and how day you to talk like this ???

Hanshika (Honey) 4 years, 2 months ago

Should i report content? (dhairya khandelwal)???

Hanshika (Honey) 4 years, 2 months ago

Thanks

Gaurav Seth 4 years, 2 months ago

On July 7, HRD Minister Ramesh Pokhriyal announced a major CBSE syllabus reduction with 30% of the syllabus slashed for the year 2020-21 for classes 9 to 12 because of the reduction in classroom teaching time due to the Covid-19 pandemic and lockdown.

Click on the link:

<font color="#FF6600"><font style="box-sizing: border-box;">Revised Curriculum for the Academic Year 2020-21</font></font>

<a data-toggle="collapse" href="http://cbseacademic.nic.in/revisedcurriculum_2021.html#collapse2" style="box-sizing:border-box; color:inherit; text-decoration:none; display:block; font-weight:bold">Revised Secondary Curriculum (IX-X)</a>

</div> </div> <div class="panel panel-default" style="border:1px solid #dddddd; margin-bottom:0px; border-radius:4px; margin-top:5px"> <div class="panel-heading" style="border-bottom:0px #dddddd; padding:10px 15px; border-top-left-radius:3px; border-top-right-radius:3px; border-top-color:#dddddd; border-right-color:#dddddd; border-left-color:#dddddd">

<a data-toggle="collapse" href="http://cbseacademic.nic.in/revisedcurriculum_2021.html#collapse1" style="box-sizing:border-box; color:inherit; text-decoration:none; display:block; font-weight:bold">Revised Senior Secondary Curriculum (XI-XII)</a>

</div> </div> </div>

ANSWER

Plasma membrane is made up of ??

Posted by Vinoth Xp 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Malavika A S 4 years, 2 months ago

Lipids and proteins

Devansh Tyagi 4 years, 2 months ago

Phospolipids bilayer and proteins

Arya Mahajan 4 years, 2 months ago

Phospholipids and protein

Hanshika (Honey) 4 years, 2 months ago

Lipids and proteins

Gaurav Seth 4 years, 2 months ago

Plasma membrane is the outermost covering of the cell which is made up of phospholipids bilayer and proteins.

ANSWER

A particle is moving in a circular path of radius r.What would be the displacement after half a circle

Posted by Aarohi Shrivastava 4 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Devansh Tiwari 4 years, 2 months ago

A diameter i.e. 2R

Suzanne Smitha 4 years, 2 months ago

The answer will be 2r. We all know that displacement is all about the total distance measured between initial and final points. After the particle cover half path of the circle, the displacement can be easily calculated by measuring the distance between initial and final points. Displacement after half circle = AB=OA + OB Hence, the displacement after half circle is 2r.

Yogita Ingle 4 years, 2 months ago

Displacement at half path is the shortest distance between the initial and final point.
So, it's equal to twice the radius of the circle =2r

Sarita Panda 4 years, 2 months ago

The displacement , after half a circle, would be equal to the diameter of the circle .So displacement would be equal to twice of r (i.e. the diameter).

ANSWER

Rabiid persons will afraid of ___ a.water b.fire c.other animals d.all of the above

Posted by Rohith Jutla 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Divya Gupta 4 years, 2 months ago

Water

Satish Shina 4 years, 2 months ago

Fire

Pankaj Gautam 4 years, 2 months ago

A option is correct

Shree Kushwaha 4 years, 2 months ago

Water option a(✓)

Suzanne Smitha 4 years, 2 months ago

a.water

ANSWER

Explain the term saturated solution?

Posted by Anmol Dwivedi 4 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Aswath Gokul 4 years, 2 months ago

Saturated solution is a solution in which no more solute can added at the temperature

Pankaj Gautam 4 years, 2 months ago

A saturated solution is a solution which can dissolve no more solute

Suzanne Smitha 4 years, 2 months ago

A saturated solution is a solution which can dissolve no more solute. It is important to know these two terms, solute and solvent. Solute is the thing that you are dissolving (example: table salt) and solvent is the thing you are dissolving the solute on (example: water).

Meghna Thapar 4 years, 2 months ago

The term saturated solution is used in chemistry to define a solution in which no more solute can be dissolved in the solvent. It is understood that saturation of the solution has been achieved when any additional substance that is added results in a solid precipitate or is let off as a gas. A saturated solution is a solution which can dissolve no more solute. Solute is the thing that you are dissolving (example: table salt) and solvent is the thing you are dissolving the solute on (example: water).

ANSWER

Assertion and Reasoning type. Read the statements carefully and choose the correct alternative from the following

Posted by Yug Agarwal 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yug Agarwal 4 years, 2 months ago

(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

ANSWER

What are the function of rough endoplasmic reticulum

Posted by It'S Preeti.... 333 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Arya Mahajan 4 years, 2 months ago

The RER helps in protein synthesis as it has ribosomes on its surface

Suzanne Smitha 4 years, 2 months ago

The function of the rough endoplasmic reticulum (ER) is to produce a fully-functioning protein.Ribosomes residing on the endoplasmic reticulum give it a non-smooth appearance, hence the name Rough ER. These fully-functioning proteins are the working molecules within every cell that perform most all functional work. Fully-functioning proteins repair muscles, lubricate your brain, provide communication between cells, perform liver function,EVERYTHING!!! They do this by using the common energy currency in the cell, ATP. This is one of the major advantages that complex cellular species (eukaryotes, including plants, fungi, animals, humans) have. They have the full complex protein manufacturing factory (rough ER, Golgi apparatus, supporting proteins). Bacteria do not have this rough ER, and hence are not equipped with the full protein factory that complex species have. Fully-functioning proteins can be used inside the cell for its own operation and maintenance AND can also be packaged for transportation out of the cell for use elsewhere. The steps to making a protein are transcription, translation, and complex folding. All living cells, including bacteria can perform transcription and translation, but only eukaryotic cells can perform the complex folding function. Transcription is the cellular process of making a messenger RNA (mRNA) from the DNA and the subsequent transportation of it out of the nuclear envelope. Translation is the cellular process of making an animo acid chain from the mRNA. Translation occurs on the Rough ER. Complex folding continues in the Golgi apparatus. The surface of the Rough ER is studded with ribosomes. These ribosomes perform the work of the translation of the mRNA into an amino acid chain. The Rough ER is typically located near, and continuous with, the outer layer of the nuclear envelope, utilizing large double membrane sheets that overlap onto each other. (The Golgi apparatus does not have a continuous membrane with the Rough ER; the started amino acid chains are transported from the Rough ER to the Golgi with little membrane-enclosed transportation pods, called vesicles. Also, the Rough ER continually works with the Golgi apparatus in the production of these fully-functioning proteins, including the marking of its target location and its packaging.) Ribosomes are a very primal molecular motor, originating from an RNA World. But these ribosomes perform their work very efficiently and all life forms use ribosomes to manufacture proteins. The development of complicated molecular machinery to form fully-functioning, complex, packaged proteins is one of the enablers that allowed the development of the eukaryotic cell and all subsequent, complex life. The development of the eukaryotic cell from bacteria is an active area of investigation by scientists at the current time. Exciting stuff, indeed!!!

Bhagyesh Kame 4 years, 2 months ago

The rough endoplasmic reticulum consists of ribosomes(synthesised by nucleolus). The main function of ribosomes is synthesis of proteins. Therefore the rough endoplasmic reticulum are associated with synthesis of proteins for intracellular activities like membrane biogenesis

Nisha Upadhyay 4 years, 2 months ago

Function of roigh endoplasmic reticulum is tge formation of protien or protien synthesis

Soumya Phattepur 4 years, 2 months ago

It's function is to produce proteins for the rest of the cell to function

4Thank You

ANSWER

All the formulas used in motion chapter

Posted by Mehbub Tahmim Ahmed 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Neha S 4 years, 2 months ago

V=U+AT

Sakshi Kumari 4 years, 2 months ago

V=u+at

Shubham Prakash 4 years, 2 months ago

V^2- u^2 = 2as

Shubham Prakash 4 years, 2 months ago

S = ut + 1/2 at^2

Shubham Prakash 4 years, 2 months ago

V=u + at

ANSWER

What is the meaning of vascular bundles

Posted by Nargis Pillai 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Nargis Pillai 4 years, 2 months ago

Thnk u☺

Arya Mahajan 4 years, 2 months ago

a strand of conducting vessels in the stem or leaves of a plant, typically with phloem on the outside and xylem on the inside.

Bhagyesh Kame 4 years, 2 months ago

The xylem tissue and phloem tissue together are known as vascular bundles

Atul Kumar Dwivedi 4 years, 2 months ago

A unit strand of the vascular system and leaves of higher plants consisting essentially of xylem and phloem is called vascular bundles

Yogita Ingle 4 years, 2 months ago

A vascular bundle is a part of the transport system in vascular plants. Vascular bundle is a unit strand of the vascular system in stems and leaves of higher plants, consisting essentially of xylem and phloem. Usually vascular bundle has phloem on the outside and xylem on the inside.

ANSWER

What are the five sources of energy available to us ? give two examples of each source.

Posted by Ishita Agrawal 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 2 months ago

1) ELECTRICAL ENERGY-HYDRO POWER DAM,MOTOR

2) LIGHT ENERGY-SUN,ANY LUMINOUS SOURCE

3) SOUND ENERGY-MICROPHONE,SOUND BOX

4) WIND ENERGY-WINDMILL

5) CHEMICAL ENERGY-BATTERY

ANSWER

Which of the following are vector quantity.? a) Mass. b) displacement. c) Speed. d) Velocity.

Posted by Femi Binod 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Neha S 4 years, 2 months ago

Displacement and velocity

Tanya Negi 4 years, 2 months ago

Velocity

Shree Kushwaha 4 years, 2 months ago

Option B displacement. (✓). Option D velocity (✓)

Navdeep Singh 4 years, 2 months ago

B.) and D.)

Arjun Das 4 years, 2 months ago

Velocity and displacement

ANSWER

Which of the following is a scalar quantity? a) Momentum. b) acceleration. c) electric energy.

Posted by Femi Binod 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Devansh Tyagi 4 years, 2 months ago

Momentum

Pankaj Gautam 4 years, 2 months ago

Electric energy

Neha S 4 years, 2 months ago

Electric energy

Divya Gupta 4 years, 2 months ago

Electric energy

Yogita Ingle 4 years, 2 months ago

electric energy

ANSWER

Which of the following is a scalar quantity? a) Moment of a force. b) power. c) electric field.

Posted by Femi Binod 4 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Atul Kumar Dwivedi 4 years, 2 months ago

Option c

Soumya Phattepur 4 years, 2 months ago

Power

Shree Kushwaha 4 years, 2 months ago

Electric field option C(✓)

ANSWER

Give two examples of scalar quantities and vector quantities.

Posted by Femi Binod 4 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Devansh Tyagi 4 years, 2 months ago

Scalar distance speed vector displacement velocity

Yogita Ingle 4 years, 2 months ago

There are plenty of scalar quantity examples, some of the common examples are:

Mass
Speed
Distance
Time
Area
Volume
Density
Temperature

Vector quantity examples are many, some of them are given below:

Linear momentum
Acceleration
Displacement
Momentum
Angular velocity
Force
Electric field

Purusaif Saifpuru 4 years, 2 months ago

Scalar distance ,speed Vector displacement.velocity

ANSWER

What arebatoms and molecules

Posted by Vallabh Pawar 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 years, 2 months ago

Atom : An atom is the smallest indivisible unit of an
OR
Atom is the smallest unit of matter.
Molecule : Molecule is the smallest unit of a compound (or an element) which always has an independent existence.

ANSWER

Two scooters starting from rest accelerate uniformly at the same rate. The second scooter travels twice the time of the first scooter. What is the relation between the distances covered by the first scooter (S1) to that of second scooter (S2)?

Posted by Ananya Mayawala 4 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 years, 2 months ago

2S2=S1

as S2 travels twice distance of s1 in the same time.

let us consider that both takes time x to reach at point b from a.

so by the given condition in the time s1 covers some distance(d) s2 will cover distance (2d) in same time

ANSWER

Which shows Tyndall effect

Posted by Yashraj More 4 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Madhusmita Sahu 4 years, 2 months ago

Colloid are nither heterogeneous nor homogenous

Atul Kumar Dwivedi 4 years, 2 months ago

Milk and starch

Soumya Phattepur 4 years, 2 months ago

Milk and starch solutions show Tyndall effect bcoz they are colliods ,and colloid is not a true solution

Sangam Singh 4 years, 2 months ago

Milk and starch solution will show tyndall effect because they are colloids. A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions. A colloid is not a true solution. The scattering of light by colloidal particle is known as tyndall effect. The scattering of light by Colloidal Solutions tells us that the colloidal particles are much bigger than the particles of a true solution. True solution does not scatter a beam of light passing through it but a Colloidal solutions scatters a beam of light passing through it. Colloids are heterogeneous in nature though they appear to be homogeneous.

Gaurav Seth 4 years, 2 months ago

Milk and starch solution will show tyndall effect because they are colloids.

A colloid is a kind of solution in which the size of solute particles is intermediate between those in true solutions and those in suspensions.

A colloid is not a true solution.

The scattering of light by colloidal particle is known as tyndall effect.
The scattering of light by Colloidal Solutions tells us that the colloidal particles are much bigger than the particles of a true solution.

True solution does not scatter a beam of light passing through it but a Colloidal solutions scatters a beam of light passing through it.

Colloids are heterogeneous in nature though they appear to be homogeneous.