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

u(initial velocity) =30m/s v(final velocity) =0m/s t(time) =10sec Find retardation? a=v-u/t a=0-30/10 a=-3m/s^2 It's mean that retardation is -3m/s^2 Find distance Use of second equation of motion to find distance S=ut+1/2at^2 S=30*10+1/2*(-3) *(10) ^2 S=300+(-150) S=300-150 S=150m It's mean that distance is 150m.

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Sarita Panda 4 years ago

Retardation -3m/s² and distance is 150m.

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ANSWER

Is chalk solution homogenous solution?

Posted by Prashant Kumar 4 years ago

CBSE > Class 09 > Science

4 answers

Jiya ??? 4 years ago

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Keshav Gupta 4 years ago

No, it is not homogeneous but it is heterogeneous mixture as it shows all properties that heterogeneous mixture shows

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Ananya K 4 years ago

In case of chalk powder, it does not completely dissolve in water. Hence chalk powder in water is a heterogeneous mixture & is not a true solution.

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Sarita Panda 4 years ago

No it's a heterogeneous mixture

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ANSWER

10 nm is equal to- a-) 10^-11cm b) 10^-9 m c)10^9 m d)10^-6 m ???

Posted by Palak Pandey 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

1 nm = 1 nanometer = 10^-9 m (formerly written 1 m )

1 m = 1 micrometer = 1 micron = 10^-6 m.

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ANSWER

Difference Between the universal gravitation constant (G) and acceleration due to gravity (g).

Posted by Vishal Dhakar 4 years ago

CBSE > Class 09 > Science

1 answers

Student 10Th 4 years ago

ANSWER The differences between G and g I as follows (1) G is called as universal gravitational constant and g is acceleration due to gravity. (2) The value of G=6.67408 × 10 −11 m 3 kg −1 s −2 while the value of g=9.8ms −2 or10ms −2 (3) The value of G remains constant everywhere while that of g varies. (4) G is a constant while g is the acceleration produced on a freely falling body.

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ANSWER

Which is a heterogeneous solution? A. Air B Brass C Sugar dissolved in water D lime water

Posted by Harshita Agarwal 4 years ago

CBSE > Class 09 > Science

5 answers

Bhumi Hingole 4 years ago

Brass

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Disha Matta 4 years ago

B brass

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Tripti Sharma 4 years ago

????????????✌️✌️????????????????????????

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Yogita Ingle 4 years ago

(B) Brass

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Yogita Ingle 4 years ago

Mixtures which do not have uniform composition throughout are called Heterogeneous Mixture. For example – mixture of soil and sand, mixture of sulphur and iron fillings, mixture of oil and water etc. The boundaries of constituent particles of a homogeneous mixture can be identified easily; as a homogeneous mixture has two or more distinct phases.

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What is the definition of momentum

Posted by Yash Joshi 4 years ago

CBSE > Class 09 > Science

3 answers

Ananya K 4 years ago

Momentum, product of the mass of a particle and its velocity. Momentum is a vector quantity; i.e., it has both magnitude and direction. Isaac Newton's second law of motion states that the time rate of change of momentum is equal to the force acting on the particle. See Newton's laws of motion.

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Yogita Ingle 4 years ago

Momentum is defined as the quantity of motion of the body. It is measured by mass×velocity, as momentum depends upon velocity, and it depends on the direction of the motion of the body as well. Momentum is a vector quantity since velocity is vector while mass is scalar.

Momentum = Mass X Velocity
p = mv

Unit of momentum is given as:

SI unit

kg.m.s^-1

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Mehak Rai 4 years ago

Momentum is defined as the product of mass and velocity of an object

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ANSWER

How we get the value of the contant gravitation that is 6.67* 10^-11N m^2 kg^2...

Posted by Ayush Kumar Chourasia 4 years ago

CBSE > Class 09 > Science

3 answers

Roshan Paswan 4 years ago

Thanks

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Arpit Sinha 4 years ago

9.8 m/s2 is the answer

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Bharat Sharma 4 years ago

9.8 is answer

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ANSWER

Explain how a man can swim in water give ans related to gravitation..

Posted by Kishlay Chaudhary 4 years ago

CBSE > Class 09 > Science

1 answers

Bharat Sharma 4 years ago

Because gravitation force attract the man in water but water also give an upward force that is much effective than gravity in water so that ?

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ANSWER

Which cell called a traffic police

Posted by Prajwal G N 4 years ago

CBSE > Class 09 > Science

5 answers

Ananya K 4 years ago

Golgi apparatus is called the traffic police of cell as it acts as assembly area for the storage processing and packaging for various cell secretions

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Jasmeet Kaur 4 years ago

To the point answer is GOLGI VESICLES

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Yogita Ingle 4 years ago

Lysosomes

The sac-like structures in a cell surrounded by membrane are called lysosomes.

They keep the cells clean by digesting and breaking the outside materials like bacteria, food entering the cell or worn-out cell organelles into small pieces.

They can digest these organic materials due to the presence of strong digestive enzymes that can brreak down organic compounds. Therefore, lysosome is also known as a suicide sac.

Many scientists believe that lysosomes are not present in plant cells and their function of lysosomes in plants is performed by vacuole.

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Udita Singh 4 years ago

Lysosome is the suicidal bags of the cell . It burst the cell when there is any damage to the cell .

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Prajwal G N 4 years ago

What is a lysosome

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ANSWER

What are inert gases

Posted by ꧁╾━╤デ╦︻ ℛ??????࿐ 4 years ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years ago

Group 18 of the modern periodic table consists of noble gases. Helium, neon, argon, krypton, xenon, and radon are noble gases. These gases are monoatomic and chemically inert under normal conditions and hence are also named as inert gases.

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Ashutosh Singh 4 years ago

Inert gases is a noble gases that is they are very few in air

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ANSWER

Name the 3 subatomic particles of an atom

Posted by Acbu Roy 4 years ago

CBSE > Class 09 > Science

2 answers

Bharat Sharma 4 years ago

Electron , protone,neutron

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꧁╾━╤デ╦︻ ℛ??????࿐ 4 years ago

Electron, Proton and Neutron are the three subatomic particles of an atom

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ANSWER

What is the valency of aluminum??

Posted by Palak Pandey 4 years ago

CBSE > Class 09 > Science

3 answers

Madhav Shukla 4 years ago

?????

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Jasmeet Kaur 4 years ago

To the point answer is +3

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Meghna Thapar 4 years ago

The valency of aluminium is 3 instead of 5 because the energy required to remove 3 electrons from the outermost shell is less than the energy required to add 5 electrons. Because aluminum has three, that means three fluorines can bond. The make the formula AlF3, also known as aluminum trifluoride. Each of the fluorine atoms gets an electron to fill their shell, and the aluminum loses three, giving it a filled shell too (remember, aluminum has three extra electrons).

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ANSWER

Examples of rabi and kharif crops.

Posted by Sazain Fayaz 4 years ago

CBSE > Class 09 > Science

3 answers

Bhumi Hingole 4 years ago

Rabi- oats Kharif-rice

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Anubhab Shivam 4 years ago

Rabi:Oats, wheat and so on kharif : maize rice and many more

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Ananya K 4 years ago

Rabi crops :- wheat, barey, oats etc Kharif crops :- rice, maize, Millet etc

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ANSWER

A sphere mass 40 kg is attracted by another sphere of mass 80 kg by force of 2.5 into 10 raise to minus 6 Newton when their centres are 30 millimeter apart find G ?

Posted by Pankaj R_S 4 years ago

CBSE > Class 09 > Science

2 answers

Shaurya Pathak 3 years, 9 months ago

Dhfgdjsjfkshrjwktkwjejfnebwbs

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Pankaj R_S 4 years ago

Plz answer fast

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ANSWER

Prove that weight of an object on moon is one-sixth of the weight measured on earth. Given mass of earth is 5.98 x1024 kg and radius of earth is 6x106 m and mass of moon is 7.36x1022 kg and radius of moon is 1.7x10 6 m.

Posted by Lakshya Gupta 4 years ago

CBSE > Class 09 > Science

3 answers

Lakshya Gupta 4 years ago

Can you please solve whole question

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Bharat Sharma 4 years ago

You can easily find answer Gravity of moon is 1/6 of the earth so you can divide and find answer

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Udita Singh 4 years ago

= GMm/r^2 Apply this formula for both moon and earth And you will get the ratio of 1:6

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ANSWER

Is water pure substance or mixture. Write about it?

Posted by Arshpreet Singh 4 years ago

CBSE > Class 09 > Science

2 answers

Ananya K 4 years ago

Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Although water is the most abundant substance on earth, it is rarely found naturally in its pure form. Most of the time, pure water has to be created. Pure water is called distilled water or deionized water.

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Ashirwad Chauhan 4 years ago

No water is not a pure substance. A pure substance is an element that is made up of only one single composition. Water is not pure because it is made up of hydrogen,oxygen and various impurities.

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ANSWER

An object is moving with uniform velocity that is its initial and final velocity remains the same throughout the motion. Write the three equations of motion for such an object?

Posted by Somya Bhargava 4 years ago

CBSE > Class 09 > Science

1 answers

Vaibhav Jain 4 years ago

Shama Gupta

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ANSWER

A ball is thrown vertically upwardswith a velocity of 49m/s calculate

Posted by Simran Kaur 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

Given parameters

Initial velocity of the ball (u) = 49m/s.

The velocity of the ball at maximum height (v) = 0.

g = 9.8m/s²

Let us considered the time taken is t to reach the maximum height H.

Consider a formula,

2gH = v² – u²

2 × (- 9.8) × H = 0 – (49)²

– 19.6 H = – 2401

H = 122.5 m

Now consider a formula,

v = u + g × t

0 = 49 + (- 9.8) × t

– 49 = – 9.8t

t = 5 sec

(1) The maximum height to ball rises = 122.5 m

(2) The total time ball takes to return to the surface of the earth = 5 + 5 = 10 sec.

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ANSWER

Image of Periodic Table

Posted by Pranav Susar 4 years ago

CBSE > Class 09 > Science

1 answers

Ananya K 4 years ago

https://images.app.goo.gl/cPqmwuNWCdQR1FpR6

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ANSWER

Is filtered tea homogeneous mixture? Why

Posted by Roshani Pal 4 years ago

CBSE > Class 09 > Science

2 answers

Roshani Pal 4 years ago

But it is given yes in the case important question ch 2

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Pranav Susar 4 years ago

No , even after filtering some particles remain.

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ANSWER

What is the definition of momentum?

Posted by Krish Gandhi 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

Momentum = Mass X Velocity

p = mv

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ANSWER

What is vaporisation?

Posted by Pranitha R 4 years ago

CBSE > Class 09 > Science

3 answers

Yogita Ingle 4 years ago

Vaporization can be defined as the process in which liquid state changes into the vapour state. As a result of an increase in temperature, the kinetic energy of the molecules increases. Due to the increases in kinetic energy, the force of attraction between the molecules reduces. As a result, they escape into the surrounding in the form of vapours. This process involves the consumption of heat energy.

Examples of Vaporization in Our Daily Life

Industrially, salt is recovered from sea-water by the process of vaporization.
Wet clothes are dried up due to the process of vaporization.

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Krish Gandhi 4 years ago

Vaporization can be defined as the process in which liquid state changes into the vapour state. As a result of an increase in temperature, the kinetic energy of the molecules increases.

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Krish Gandhi 4 years ago

Vaporisation is the phenomenon in which the liquid state changes into gaseous state.

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ANSWER

A car weighing 1200kg is uniformly accelerated from rest and it covers a distance of 40meters in 5 seconds. Calculate the work done by the engine of car during this time and what is the kinetic energy of the car

Posted by Bhawna Jain 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

s=ut+1/2at²
40=1/2a(5)²
a=80/25
a=3.2m/s²
f=ma
=1200*3.2
f=3840N
work=fs
=3840*40
w=153600J

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ANSWER

_______ is a metalloid...

Posted by Acbu Roy 4 years ago

CBSE > Class 09 > Science

2 answers

Bharat Sharma 4 years ago

Boron,germanium, silicon is example of metaliioids

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Meghna Thapar 4 years ago

A metalloid is an element that has properties that are intermediate between those of metals and nonmetals. Metalloids can also be called semimetals. On the periodic table, the elements colored yellow, which generally border the stair-step line, are considered to be metalloids. The term metalloids has been used to arbitrarily classify those elements whose properties are considered to be intermediate between those of obvious metals and obvious non-metals.

Elements: Silicon; Boron; Arsenic; Antimony

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ANSWER

How can we separate two miscible liquids ? Explain the method .

Posted by Udita Singh 4 years ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 4 years ago

Distillation is used for separating a mixture of miscible liquids into its components, when both the components are miscible with each other and the difference in the boiling points of the liquid components is more than 20-25 degree celsius.

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Manalisha Majhi 4 years ago

To seperate a mixture of two or more miscible liquids for which the difference in boiling points is less than 25k , fractional distillation process is used .

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ANSWER

What is cathode tube

Posted by ꧁╾━╤デ╦︻ ℛ??????࿐ 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years ago

A cathode-ray tube (CRT) is a vacuum tube in which an electron beam, deflected by applied electric or magnetic fields, produces a trace on a fluorescent screen. The function of the cathode ray tube is to convert an electrical signal into a visual display.

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Thr largest cell in the human body is:

Posted by Rooh Choudhary 4 years ago

CBSE > Class 09 > Science