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

Two body a nd bof masses 2mamd m are deopped from height 2h and h respectively the ratio of tume taken by them is

Posted by Ravi Raushan 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

In third law of motion why force act on different objects and never on the same objects?

Posted by Megha Sinha 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Diksha Laniya🐥 4 years, 3 months ago

The third law of motion states that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first. These two forces are always equal in magnitude but opposite in direction. These forces act on different objects and never on the same object.

ANSWER

Action acts first or reaction? Or both reacts at same time?

Posted by Megha Sinha 4 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Prince Yadav 4 years, 3 months ago

Action occur first

Diksha Laniya🐥 4 years, 3 months ago

Action and Reaction First an action occurs—Jerod pushes against the ground with his foot. Then a reaction occurs—the ground pushes back on Jerod! This force causes Jerod to move forward. The reaction is always equal in strength to the action but in the opposite direction.

ANSWER

On a 60 km straight road, a bus travels the first 30 km with a uniform speed of 30 kmh-1. How fast must the bus travel the next 30 km so as to have average speed of 40 kmh-1 for the entire trip?

Posted by Preksha Chandrakar 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Prince Yadav 4 years, 3 months ago

Avg speed of entire trip - V and total distance d=60Km and total time taken is t. Avg speed in first 30Km _ v1=30Kmh-1 and time taken to cover it is t1. Avg speed in last 30Km _ v2=? and time taken to cover it is t2. V = d/t V = 60/(t1+t2) V = 60/[(30/v1)+(30/v2)] 40 = 60/[(30/30)+(30/v2)] (30/30)+(30/v2) = 60/40 = 1.5 1 + (30/v2) = 1.5 30/v2 =0.5 v2 = 30/0.5 v2 = 60 Kmh-1

ANSWER

The bus decreases its speed from 90 km per hour to 60 kilometre per hour in 15 seconds find the acceleration of the bus

Posted by Shruti Mehan 4 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Yash Chaudhary 4 years, 3 months ago

A=V-U/T A=90-60/15 =30/15 =2km/min

Laxmi Yadav 4 years, 3 months ago

-200m/s^2

ANSWER

2. Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C

Posted by Gaurav Bishaya 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Pranav Pranjal 4 years, 3 months ago

A) 2m/s --- average speed Average Velocity---- 2m/s B) Average Speed--- 1.90m/s Average Velocity--- 0.952m/s

ANSWER

Q.A bus moving along a straight line at 20m/s undergoes an acceleration of 4 m/s². After 2 second, it's speed will be:

Posted by Gaurav Bishaya 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why do solids generally lack the property of diffusion

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Ashish Tiwari 4 years, 3 months ago

Solids lack the property of diffusion because the particles in the solids are closely arranged leaving very little inter molecular space. he particles of the solids have less inter-molecular spaces between them which does not allow free movement of particles. The particles can only move about their mean position.

ANSWER

Define the vaporisation

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Harshita Sarda 4 years, 3 months ago

Conversion of liquid to gas or vapours is known as vaporisation

Priya Nagar 4 years, 3 months ago

Konsa answer

Nashrah Raza 4 years, 3 months ago

A process in which liquid converts into gases is called veporisation.

Prince Yadav 4 years, 3 months ago

Your question is wrong ❌ priya nagar

ANSWER

Define the sublimation

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

3 answers

Harshita Sarda 4 years, 3 months ago

Conversion of solid into gas is known as sublimation

Nashrah Raza 4 years, 3 months ago

It is a process in which solid converts into gas upon heating is called sublimation Eg:- Napthalene ball Nh⁴ cl

Dhruv Chopade 4 years, 3 months ago

Akiawbanak

ANSWER

A certain substance can be compressed to very less extant but take up the shape of any container in which it in placed what will be its physical states

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

A pieace of chalk cab be broken into small particular on hamming but it is not possible to break a piece of iron in the same manner

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

2 answers

Harjot Singh 4 years, 3 months ago

Because the force of attraction between the particles of iron is larger than the force of attraction between the particles of the chalk

Gaurav Bishaya 4 years, 3 months ago

Yes

ANSWER

Define the boiling point

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Shivi Singh 4 years, 3 months ago

The temperature at which a liquid starts boiling to become a gas at atmospheric pressure is called it's boiling point. The boiling point of water is 100 C or 373 K

ANSWER

Define the boiling

Posted by Priya Nagar 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Bishaya 4 years, 3 months ago

When the whole amount of water or any other liquid is heat .

ANSWER

On entering the house Tanu asked if her mother had coffee with a lady visitor. Her mother replied in the affirmative. How did Tanu make her deductions?

Posted by Khushi Gupta 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Notes of chapter 1 of class 9

Posted by Kartik Sharma 4 years, 3 months ago

CBSE > Class 09 > Science

4 answers

Prince Yadav 4 years, 3 months ago

See in this app

Hamza Shiekh 4 years, 3 months ago

On CBSE guide app

Hamza Shiekh 4 years, 3 months ago

Choose subject > Choose chapter > CBSE revision notes

Priya Nagar 4 years, 3 months ago

Which subject

ANSWER

Name the type of motion in which a body has uniform speed but not uniform velocity.

Posted by Aarushi Rawat 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Define average speed, write any one points of difference between average speed and average velocity

Posted by Archana Kumari 4 years, 3 months ago

CBSE > Class 09 > Science

1 answers

Mona Yadav 4 years, 3 months ago

Average speed is the physical quantity that depends on only magnitude but average velocity depends not only on magnitude but direction also .

ANSWER

1). Calculate the concentration of a solution which contains 2.5g of salt dissolved in 50g of water.

Posted by Mehul Gulati 4 years, 3 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Where are proteins synthesised inside the cell ??

Posted by Sakshi Bharadwaj 4 years, 4 months ago

CBSE > Class 09 > Science

4 answers

Sowndarya . 4 years, 3 months ago

Proteins synthesized inside the cell in ribosomes

Ayush Singh Chauhan 4 years, 4 months ago

Because of the presence of ribosomes

Jasmeet Kaur 4 years, 4 months ago

In ribosomes

Rakhi Sharma 4 years, 4 months ago

In Ribosomes

ANSWER

What is the quantity which is measured by the area of the fat below the velocity time graph

Posted by Satish Kumar 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Jasmeet Kaur 4 years, 4 months ago

The area fat by the velocity -time graph and the time axis give the magnitude of displacement.

ANSWER

If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen ?

Posted by Sakshi Bharadwaj 4 years, 4 months ago

CBSE > Class 09 > Science

4 answers

Sowndarya . 4 years, 3 months ago

If the organisation of a cell is destroyed due to some physical or chemical influence then the cell is not able to perform its basic fuctions...

Mona Yadav 4 years, 3 months ago

The lysosomes present inside the cell would swallow the whole cell . it's therefore also known as the suicide bag of the cell .

Jasmeet Kaur 4 years, 4 months ago

If the organisation of a cell is destroyed due to some physical or chemical influence , then the cell will not be able to perform the basic functions like respiration, nutrition, excretion etc . this may stop all the life activities and may result in the death

Digbijoy Debnath 4 years, 4 months ago

If the organisation of a cell is destroyed due to some physical or chemical influence, then the cell will not be able to perform the basic functions like respiration, nutrition, excretion etc. This may stop all the life activities and may result in its death.

ANSWER

Diagram of cell

Posted by Gurman Singh 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Jasmeet Kaur 4 years, 4 months ago

photos are not able to send her

Digbijoy Debnath 4 years, 4 months ago

Photos are not able to send here

ANSWER

Derive a=mv^2/r

Posted by Aditya Loha 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Digbijoy Debnath 4 years, 4 months ago

Fc = m v2 / r The net force on an object moving in a circle provides the centripetal force, Fc = m v2 / r, necessary to keep an object moving in a circle.

ANSWER

Which type of division is found in the cell which are damaged. (1)

Posted by Sarthak Soni 4 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Sir board ka preparation kai liye science mai ncert hi na chalega

Posted by Anand Gupta 4 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why is small intestine in herbivores and longer than carnivores?

Posted by Harman Bajwa 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Digbijoy Debnath 4 years, 4 months ago

The small intestine is longer in herbivore than in carnivore because herbivores eat only grass which is full of cellulose and the digestion of cellulose takes a long time. ... Herbivores need a longer small intestine to allow cellulose to be digested as taken from green plants.

ANSWER

ho discovered cell and how ?

Posted by Vansh Miyan 4 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Priyanka Meena 4 years, 3 months ago

in 1665, Robert Hooke discovered cells while examining a thin slice of cork through a self-designed microscope. He observed that the cork resembled the structure of a honeycomb consisting of numerous tiny compartments. The minuscule boxes are referred to as cells.

Sakshi Bharadwaj 4 years, 4 months ago

Cells were first discovered by Robert hooke in 1665. He observed the cells in a cork slice with the help of a primitive microscope.

? . 4 years, 4 months ago

Robert hooke discovered cell in his primitive microscope in 1665

ANSWER

Do anyone know who discovered cell?

Posted by Cbse Student 4 years, 4 months ago

CBSE > Class 09 > Science

5 answers

Sowndarya . 4 years, 3 months ago

Robert hooke discoverd cell in 1665 in a dead cell in cork slice With a primitive microscope....

Mona Yadav 4 years, 3 months ago

Yes Robert Hooke .

Dikshita Bohra 4 years, 3 months ago

Robert Hooke

? . 4 years, 4 months ago

Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665Robert hooke discovered cell in his primitive microscope in 1665

Cbse Student 4 years, 4 months ago

I know that's Robert hooke

ANSWER

Matter is of which type

Posted by Garvit Khandelwal 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Suhani Pandey 4 years, 4 months ago

Matter is in 3 types Solid Liquid Gas These three are very common that we know until 8 but now there are 2 more states which are Plasma Bose einstein condensate (BEC)

ANSWER

Page 101 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