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

Answer : Speed of a body gives us an idea of how slow or fast that body is moving. The speed of a running car at any instant of time is shown by an instrument called "Speedometer". The distance travelled by a car is measured by another instrument called "Odometer".

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Velocity time graph

Posted by Rajat Bhatt 4 years, 5 months ago

CBSE > Class 09 > Science

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A motor boat starting from rest on a lake accelerates a straight line at a constant rate of 3.0 m spower -2 for 8.0 s. How far does the boat travel during this time?

Posted by Apoorva Singh 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Rishika Rawat 4 years, 5 months ago

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0

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A motor boat starting from rest on a lake accelerates a straight line at a constant rate of 3.0 m spower -2

Posted by Apoorva Singh 4 years, 5 months ago

CBSE > Class 09 > Science

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What is meant by saying that latent heat of vapours of water is 226 kj

Posted by Pradhuman Singh 4 years, 5 months ago

CBSE > Class 09 > Science

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Which of these component as blood fight infection????

Posted by Ankit Raj 4 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Dhana Lakshmi S 4 years, 5 months ago

WBC (white blood cells) or it is also know as leucocytes.

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Ayushi . 4 years, 5 months ago

White blood cells (WBC)

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Ankit Raj 4 years, 5 months ago

G afternoon bro

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Molecular mass of water (H2o) is ??

Posted by Ankit Raj 4 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Rajat Bhatt 4 years, 5 months ago

Hope u understood

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Rajat Bhatt 4 years, 5 months ago

2(H) + 1(O) = (2 + 16)= 18 u

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Rajat Bhatt 4 years, 5 months ago

So that , a.mass of O is 16 and a.mass of H is 1

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Rajat Bhatt 4 years, 5 months ago

(H20) = 2 atom of h and 1 atom of oxygen

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Symbol of iron is ????

Posted by Ankit Raj 4 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Varun Vaid 4 years, 5 months ago

fe stands for iron

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Dhana Lakshmi S 4 years, 5 months ago

Fe stands for Iron.

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Ankur Kumar 4 years, 5 months ago

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Monica ✨☄️ 4 years, 5 months ago

Fe is the symbol of iron

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Atomic radius is measured in nanometers is

Posted by Ankit Raj 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yashika Khantwal 4 years, 4 months ago

Picometer

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Make a MIND MAP on various components of blood by providing all necessary information about them

Posted by Veedulamudi Manjusha Chand 4 years, 5 months ago

CBSE > Class 09 > Science

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A car travels 20m /sec along a road a child runs out into the road 50m ahead the car driver stop the pedal what must the declaration be if the car is stop just before it reach the child

Posted by Srihaan Chandra 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 4 months ago

Initial velocity, u=20m/s
Final velocity, v=0m/s
Distance, s=50m

Using relation, v²= u²+ 2as
0²= (20)²+ 2 × a × 50
0²= 400 + 100a
−400 = 100a

a = −400 / 100 = −4m/s²
The car's deceleration must be 4m/s².

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What are vacuoles

Posted by Tanishka Dhumal 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Monica ✨☄️ 4 years, 5 months ago

Vacuoles are the places in the cell where food is stored. Plant cell has large but one vacuoles where as animal cell has small but many vacuoles.

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Hariom Waditake 4 years, 5 months ago

Vacuoles are storage sacs for solid and liquid contents.

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A police jeep chasing velocity of 45 km/hr a their is in another jeep moving with a velocity of 153km/hr police fires a bullet with velocity of 180m /sec calculate the velocity of bullet to strike /hit the jeep of theif

Posted by Srihaan Chandra 4 years, 5 months ago

CBSE > Class 09 > Science

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A ball hit a wall horizontal at 6m/s it rebounce horizontal at 4.4 m/s the ball is in contact with the wall for 0.04 sec what is acceleration of the ball

Posted by Srihaan Chandra 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 4 months ago

initial velocity, u = 6 m/s and final velocity, v= -4.4 m/s

time = 0.04s

thus acceleration = (v-u)/t

a =(- 4.4 - 6)/ 0.04 = -10.4/ 0.04 = -260 m/s²

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A substance has a define volume but no define shape state weather this substance is a solid a liquid or a gas

Posted by Gayatri Kumari 4 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Ankur Kumar 4 years, 5 months ago

Liquid

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Niva Nishka 4 years, 5 months ago

Liquid

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Aishwarya .R 4 years, 5 months ago

Liquid

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Master Jd 4 years, 5 months ago

Answer : "Liquid" has a definite volume but no definite shape.

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Anshu Kumar 4 years, 5 months ago

Liquid has a definite volume but no definite shape so it takes the shape of container in which it is stored.

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ANSWER

How to find average velocity?

Posted by Saumya Rwt 4 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Rajat Bhatt 4 years, 5 months ago

Both formula are same given in NCERT

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Varnika Sondhi 4 years, 5 months ago

Averages velocity= total displacement/ total time

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Master Jd 4 years, 5 months ago

But that's for Average speed Piyush

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Piyush Kr 4 years, 5 months ago

Total distance traveled by total time taken

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Master Jd 4 years, 5 months ago

Answer : By the formula :- Average velocity = Total displacement/Total time taken.

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Where do the lipids and proteins constituting the cell membrane get synthesized??

Posted by Suhani Bhatia 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Niva Nishka 4 years, 5 months ago

Rough endoplasmic reticulum ( proteins) Smooth endoplasmic reticulum (lipids)

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Riyanshi ... 4 years, 5 months ago

Proteins and lipids are being synthesized in endoplasmic reticulum... it is the major function of endoplasmic reticulum

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Please help me give me 5 example of linear, circular, vibratary motion

Posted by Aryan Gupta 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Karthika Sree 4 years, 5 months ago

The flexibility in plant is due to a tissue called

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Ekansh Nandan 4 years, 5 months ago

Linear-Motion of a cycle moving in a straight line. Circular-Motion of an ant moving in a circle vibratory-Layrnx

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Who discovered morden cell Theory?

Posted by Hansika Singariya 4 years, 5 months ago

CBSE > Class 09 > Science

5 answers

The Anushka 4 years, 5 months ago

Theodor Schwann

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Saumya Rwt 4 years, 5 months ago

Schwann in 1839

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Riyanshi ... 4 years, 5 months ago

Rudolf virchow..

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Adarsh Kumar 4 years, 5 months ago

Theodor Schwann in 1839

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Yuthojit Dey Ix-7 4 years, 5 months ago

Theodar Schwan

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Convert the following temperature to Celsius sale (a) 300k ( b) 573k

Posted by Sujeeth Hulyal 4 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Saumya Rwt 4 years, 5 months ago

27°C and 300°C

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Adarsh Kumar 4 years, 5 months ago

When we have to convert k into °C we have to substrate 273 from 300 ans will be 27°C & for a ex. 27°C convert in k then we have to add 27+273=300

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Sanket Kumar 4 years, 5 months ago

Simple hai bro (a) 27°C , (b) 300°C

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Which type of the cell division is required for growth and repair of the body and which type is involved in formation of gamates?

Posted by Saumya Rwt 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yuthojit Dey Ix-7 4 years, 5 months ago

Mitosis

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A particle is moving in a circular path of radius r the displacement after 3.5 would be?

Posted by Saumya Rwt 4 years, 5 months ago

CBSE > Class 09 > Science

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1. Where do smooth muscle found? What are there function? 2. Differeantiate between Striated muscle & Smooth muscle. 3. What is the function of intercalated disc in cardiac muscle? 4. Why do the cardiac muscle cell don't get fatigue inspite of continuous contraction & relaxation

Posted by Adarsh Kumar 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Adarsh Kumar 4 years, 5 months ago

Why

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Rajat Bhatt 4 years, 5 months ago

Bhai apna online test copy kiya hai????????

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A train is traveling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of -0.5m/s². Find how far the train will go before it is brought to rest.

Posted by Nissi Cherian 4 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Rajat Bhatt 4 years, 5 months ago

I think now u can solve

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Rajat Bhatt 4 years, 5 months ago

0.5 = 0-25/ (0.5 x time)

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Rajat Bhatt 4 years, 5 months ago

A = 0.5...... U ( initial velocity ) = 90 x 5/ 18 = 25 m/s.......... V = 0 m/s

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Rajat Bhatt 4 years, 5 months ago

Put here the formula of retardation which is .................. a = v- u / at

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What is meant by pure substance

Posted by Kartik Boss Sharma 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Dipsikha Devi 4 years, 5 months ago

A substance that has a fixed chemical composition throughout is called a pure substance. A pure substance does not have to be of a single element or compound.

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Define amu❓

Posted by Sumesh Sharma 4 years, 5 months ago

CBSE > Class 09 > Science