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

No products in the cart.

Ask questions which are clear, concise and easy to understand.

Ask Question

A block is thrown upwards with a kinetic energy 1j. If it goes up to a maximum height of 1m, find the mass of the block.

Posted by Sakshi Sharma 3 years ago

CBSE > Class 09 > Science

2 answers

Vaibhav Verma 3 years ago

A/Q. Since height is given Therefore we can say that Ek. = Ep. ..... @eq.1 Let's calculate Ep. Ep. = mgh = m × 9.8 m/s^2 × 1m = m × 9.8 m/s^2 From eq 1) Ep. = 1Joule 1= m × 9.8m/s^2 m = 1/ 9.8m/s^2 On furthermore calculations... m= 0.102 kg If required convert mass in kg to g. m = 102 grams. Hope it helps!! Thank you

Dinesh Singh 3 years ago

The kinetic energy will be comverted into its potential energy when it reaches its max height, therefore we can equate the potential energy with kinetic energy

Kinetic energy = potential energy

1J = mgh

1 = m × 9.8 ×1

m = 1/9.8

m = 0.1020 kg = 102 gram

ANSWER

Suppose a squirrel is moving at a steady speed from the base of a tree towards some nuts. It then stays in the same position for a while, eating the nuts, before returning to the tree at the same speed. A graph can be plotted with distance on the x-axis and the time on y-axis. Squirrel runs from the tree Squirrel returns to the tree Tree 9 Time (s) 10 12 Observe the graph carefully and answer the following questions. (1) Which part of the graph shows the squirrel moving away from the tree? (ii) Name the point on the graph which is 6 m away from the base of the tree. (iii) Which part of the graph shows that the squirrel is not moving? (iv) Which part of the graph shows that the squirrel is returning to the tree? (v) Calculate the speed of the squirrel from the graph during its journey.

Posted by Deepanshu Gurwani 3 years ago

CBSE > Class 09 > Science

1 answers

Garima Tamrakar 3 years ago

Kya pta

ANSWER

Difference between molecules of elements and molecules of compounds.

Posted by Ananya Dubey 3 years ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years ago

All elemental molecules are made of atoms of a single element. Fig. 2.9. Compounds are made of two or more atoms of different elements, such as water (H₂O) and methane (CH₄).

ANSWER

What is organic farming? Pls tell me

Posted by Manseerat Kaur 3 years ago

CBSE > Class 09 > Science

3 answers

Ravinder Singh 3 years ago

The farming method in which there is Minimum or zero percent use of chemical fertilizers and maximum Use of manure occurred. This farming Was usually occurs in villages

Kamlesh Kumar Raj 3 years ago

Hello

Saumya Gaur 3 years ago

Organic farming is the agriculture system in which organic materials are used For example : Green manure , compost manure etc ....... Organic farming is also known as ecological farming .

ANSWER

What is nucleus 😟

Posted by $#^Ğü|\| |\|^!|\|❤ 3 years ago

CBSE > Class 09 > Science

2 answers

Devika Prajapati 3 years ago

Nucleus is the brain of the cell . It is known as the brain of the cell because it control all the metabolic activity of the cell. Function: it regulates cell cycle It control all the metabolic activity of the cell..

Saumya Gaur 3 years ago

It is the headquarter of the cell , it controls all the metabolic activities of the cell . It contains the genetic information of the cell in the form of DNA .

ANSWER

How is sound produced?

Posted by Sanchi Lamba 3 years ago

CBSE > Class 09 > Science

5 answers

Ravinder Singh 3 years ago

Sound is a mechanical system produce due to rapid vibration and thus produces a feeling of sensation in Human ears

Saumya Gaur 3 years ago

Sound is produced due to vibrations .

Joy Deep 7 A 3 years ago

It is produced due to vibration of objects is rapid to and for motion of any object

Niti Sharma 3 years ago

Sound is produced through vibration

$#^Ğü|\| |\|^!|\|❤ 3 years ago

Sound is produced from our vocal gland . Thanku

ANSWER

to weight bacl2 or na2so4 use a polythene bags and spring balence

Posted by Anita Bhati 3 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

The motion of body of mass 5kg is shown in the velocity time graph. Find the acceleration

Posted by Kartiki Lingayat 3 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Saumya Gaur 3 years ago

But, where is graph ?

ANSWER

Sound travel faster on a rainy day than on a dry day ? Why ?

Posted by Jitisha Ramanandi 3 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Saumya Gaur 3 years ago

Computer is a machine ......

Saumya Gaur 3 years ago

Sound travel faster on a rainy day than on a dry day because in rainy day humidity is more or the water vapours present in air is more so the density is more & the sound travel faster .

Subhash Raut 3 years, 1 month ago

What is computer

ANSWER

Elustrate the law of conservation of energy by discussing the free fall of a body

Posted by Arpita Swain 3 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Preeti Dabral 3 years, 1 month ago

Potential energy + kinetic energy = constant

Energy can neither be created nor destroyed, but it is transformed from one form to another.
Alternatively, whenever energy gets transformed, the total energy remains unchanged.
When an object at its highest position from the ground it has the maximum amount of potential energy.
When the object starts falling there is an increase in the kinetic energy and a decrease in potential energy as the speed increases the kinetic energy also increases but the sum of the potential and the kinetic energy remains constant when it is just above the ground the kinetic energy is maximum and the potential energy is minimum.
This relation between the potential and kinetic energy is expressed as,
Potential energy + kinetic energy=constant

Smriti Gupta 3 years ago

Energy can neither be created nor destroyed, but it is transformed from one form to another. If you throw a ball so at the maxium height the potential energy is maximum & the kinetic energy is zero while the ball falls back & it strikes the ground so the potential energy is zero & the kinetic energy is maximum .

Vaibhav Verma 3 years ago

Is proper proving required or not?

Saumya Gaur 3 years ago

Energy can neither be created nor destroyed, but it is transformed from one form to another. If you throw a ball so at the maxium height the potential energy is maximum & the kinetic energy is zero while the ball falls back & it strikes the ground so the potential energy is zero & the kinetic energy is maximum .

ANSWER

What is the difference between mass and wieght

Posted by Harsh Rathore 3 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Vaibhav Verma 3 years ago

Proper answer. Mass ÷ 1) SI unit is kg. 2) Constant everywhere 3) It not depend on gravity and has no effect on it. 4) Mass can never be zero.. Rather than some high exception. Weight ÷ 1) SI unit is Newton (N) 2) Not constant. 3) Depending on gravity has effect on it. 4) If g=0 , then weight = 0. Hence weight can be 0. Thank you🌹

Saumya Gaur 3 years ago

Mass is the matter present in the object. Weight is the how earth pulls us strongly . Thank you

Arpita Swain 3 years, 1 month ago

Mass is the actual quantity present on a body & the weight of an obj. Is the force with which it is attracted towards the earth.

ANSWER

What is the difference between gravitional and gravity

Posted by Harsh Rathore 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 years, 1 month ago

Gravitation is the force of attraction between any two bodies in the universe while gravity refers to the force of attraction between any body and the earth.

Saumya Gaur 3 years ago

Gravitation is the force of attraction b/w two bodies in the universe as well as gravity is the force of attraction b/w any body & the earth . 🌎 Thanks

ANSWER

What do you mean by oscillation of a sound wave?

Posted by Jitisha Ramanandi 3 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years, 1 month ago

An oscillation is said to be forced when it is in response to an excitation; otherwise it is called free vibration (see EIGENTON, RESONANCE, STANDING WAVES, SYMPATHETIC VIBRATION). Oscillations whose FREQUENCY lies within the audible range are heard as SOUND. Compare: VIBRATION.

ANSWER

If the mass of an object be 10 kg ,what is its weight?(g=9.8 m/s

Posted by Karan Chaudhary 3 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Vaibhav Verma 3 years ago

Since w=mg W =10 × 9.8 W = 98N

Saumya Gaur 3 years ago

"98 Newton" because , Weight is the 'how earth pulls us strongly'.... therefore, The weight = The force And we know that (F=m.a) So , F = 10 ×9.8 = 98 N .

Manish Verma 3 years, 1 month ago

98 Newton

ANSWER

Have any difference between molecules and compounds

Posted by Ansh Upadhyay 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Saumya Gaur 3 years ago

Difference b/w molecules and compound is Molecule is the group of two or more atom while , Compound is the substance which is formed by two or more elements of different types which are combine chemically in a fixed proportion.

Arpita Swain 3 years, 1 month ago

Molecule is the smallest particle of an element

ANSWER

What is acds

Posted by Ritika Chaudhary Jaatni Tkd 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Saumya Gaur 3 years ago

A group of cells that are similar in function is called tissue .

Pritam Rathore 3 years, 1 month ago

Definition of tissue

ANSWER

Find the mass of a body which has 5J of kinetic energy while moving at a speed of 2m/s.

Posted by Sakshi Sharma 3 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Vaibhav Verma 3 years ago

Given ÷ Ek. = 5J v= 2m/s Ek. = 1/2 mv^2 5 = 1/2 × m × (2) ^2 5 = 1/2 × m × 4 On further calculations. 5 = 1/2 × m 5 × 1/2 = m 2.5 kg = m Hence solved.

Saumya Gaur 3 years ago

K.E = 1/2 mv² ........................ , 5 = 1/2 ×m × 2² ................................. , 5 = 1/2 ×m × 4 ........................... , 5 = 4/2 m......................................., 5 = 2m ..........., 5/2 =m .......... , "2.5 = m " answer ......

Saumya Gaur 3 years ago

2.5 kg K.E = 1/2 mv² 5 =1/2 ×m × 2² 5 =4/2m 5 = 2m 5/2 = m 2.5 =m

Vivek Kumar 3 years, 1 month ago

2.5 kg

Unknown Soul 3 years, 1 month ago

K.E=½mv² 5=½×m×2×2 5=2m 5/2=m 2.5kg=mass

ANSWER

A 2kg body is sliding up an inclined plane of inclination 30°. Find the work done by the force of gravity in moving the body through 1m.

Posted by Sakshi Sharma 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Saumya Gaur 3 years ago

19.6 N

Vivek Kumar 3 years, 1 month ago

30 what

ANSWER

What happens to the momentum of the body whose velocity is halved?

Posted by Jitisha Ramanandi 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Saumya Gaur 3 years ago

Momentum also gets half .

Sharath Chandra 3 years, 1 month ago

Momentum also gets half

ANSWER

How will you separate common salt sulfur powder and sand from their mixture by taking procedure observation with diagram also

Posted by Riya Kumari 3 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Vaibhav Verma 3 years ago

Add H2O as a suitable solvent. Nacl would get dissolved . Through distillation H2O and Nacl could be separated ( if required). Leaving residues behind as S powder and Sand. Add carbon disulphide as suitable solvent.. S powder would get dissolved.. And then filter the solution.. You'll get bach S powder. Remains sand.. Hence separated.

ANSWER

Minerals document

Posted by Dkash Shah 3 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

Define matter. On which classification Types of matter distributed. Also explain the two properties of matter

Posted by Ravinder Singh 3 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Preeti Dabral 3 years, 1 month ago

Matter can be classified into two broad categories: pure substances and mixtures. A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.

Intensive and Extensive Properties of Matter Both the physical and chemical properties of matter are either extensive or intensive. Extensive properties including mass and volume are proportional to the amount of matter being weighed. Density and colour, for example, are not affected by the amount of matter present.

Saumya Gaur 3 years ago

Anything which has mass & occupy space is called matter. There are two types of matter .......... ☆ Pure substances , ☆ Mixtures Properties of Matter are : 1. Chemical property , 2. Physical property ........

Preeti Dabral 3 years, 1 month ago

Matter is anything that takes up space and can be weighed. In other words, matter has volume and mass. There are many different substances, or types of matter, in the universe.

ANSWER

Match the following with the correct response:- 1) sublimation 2) Evaporation 3)Latent heat of vaporization 4)Latent heat of fusion (A) Change of liquid state into vapours without coming to its boiling point (B) Heat required to change the state of 1Kg of solid into liquid (C) Heat required to change the state of 1Kg liquid into vapours (D) Change of solid directly into vapours

Posted by Kanchan Kamboj 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 years, 1 month ago

1 - d
2- a
3 - b
4 - c

Saumya Gaur 3 years ago

1 - D , 2 - A , 3 - C , 4 - B

ANSWER

Who is father of binomial system?write the step of binomial system

Posted by Dipti Sharma 3 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Raunak Yadav 3 years ago

Carolus Linnaeus

Piyush Shahare 3 years, 1 month ago

You

Rajeswari Devi 3 years, 1 month ago

Give

Sushamita Singh 3 years, 1 month ago

Carolus Linnaeus

ANSWER

Properties of plant kingdom

Posted by Dipti Sharma 3 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years, 1 month ago

These living organisms are made of eukaryotic cells and are multicellular. The cells have a cell wall which is made of cellulose. These are autotrophic and synthesize food by photosynthesis due to the presence of chloroplasts.

ANSWER

Chloroplast and chlorophyll mein kya difference hai?

Posted by Pawan Pandey 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Saumya Gaur 3 years ago

Chloroplast is a green coloured cell organelle as well as Chlorophyll is the green pigment .

Rimi Tomar 3 years, 1 month ago

Chloroplast is a cel organelle but chlorophyll is a green colour pigment that held in making food during the process of photosynthesis and it also clean environment by producing oxygen and also provide green colour to plant parts.

ANSWER

Plant body mein konsa fluid flow karta hai like blood is flow in Animal body

Posted by Pawan Pandey 3 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Saumya Gaur 3 years ago

Chlorophyll

Rimi Tomar 3 years, 1 month ago

Chlorophyll

__ Shashwat__ 3 years, 1 month ago

Chlorophyll

ANSWER

Any two pure substances

Posted by Aditya Mishra 3 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Yuvarajan Andaman 3 years ago

Elements and compounds

Saumya Gaur 3 years ago

Gold , Iron .....

Arpita Swain 3 years, 1 month ago

Oxygen chlorine

Riya Kumari 3 years, 1 month ago

Sodium, hydroxide

Rimi Tomar 3 years, 1 month ago

Gold , oxygen

ANSWER

A bag of suger weighs w at a certain place on the equator. If this bag is taken to Antarctica, then will it weigh the same or more or less. Give a reason for your answer

Posted by Laishram Jeetson 3 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Preeti Dabral 3 years, 1 month ago

The bag of sugar will weigh more at Antarctica i.e. the poles.
Reason: The polar radius of the earth is less than the equatorial radius of the earth. The acceleration due to gravity is inversely proportional to the square of the radius of the earth. Hence, its value at the poles is greater than its value at the equator. Thus a body weighs more at the poles than at the equator. Since weight is the product of mass and acceleration due to gravity, therefore the bag of sugar will weigh more at Antarctica.

Vaibhav Verma 3 years ago

According to previous question influence of gravity could also be added

ANSWER

What is the need of sustainable practices in agriculture and animal husbandry?Explain.

Posted by Abhi Kumar 3 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Preeti Dabral 3 years, 1 month ago

Agriculture and the animal husbandry are very important economical sectors in any country.That's why we have to take several measures to develop these sectors. We should apply sustainable method in these sectors to maintain the proper preservation of the natural resources for these sectors need for our future generation. If we ruthlessly expand these sectors the natural resources will be depleted soon. That's why sustainable practices are becoming very important nowadays in the agriculture and animal husbandry.

ANSWER

Page 33 of 1369

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Google Play

Download myCBSEguide App