ICSE & ISC > Class 09 > Physics | CBSE Board | Homework Help

Angstrom (Å), unit of length used chiefly in measuring wavelengths of light, equal to 10−10 metre, or 0.1 nanometer. One angstrom is equal to 10−10 m (one ten-billionth of a meter or 0.1 nanometers). Although the unit is recognized world-wide, it is not an International System (SI) or metric unit. It is named for the 19th-century Swedish physicist Anders Jonas Ångström.

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Are motion and rest relative term

Posted by Sangita Kumari 3 years, 11 months ago

ICSE & ISC > Class 09 > Physics

4 answers

Hitesh Bansal 2 years, 11 months ago

Yes

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Aditya Kesarwani 3 years, 10 months ago

Yes, they are relative terms you can better understand by the example : A man is sitting in train compartment in a rest position but according to the outter surrounding of the train he is in the motion.

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Prathamesh Biradar 3 years, 10 months ago

Yes

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Sangita Kumari 3 years, 11 months ago

Yes

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What is latent heat

Posted by Vedant Motewar 3 years, 11 months ago

ICSE & ISC > Class 09 > Physics

1 answers

Yogita Ingle 3 years, 11 months ago

The heat energy which has to be supplied to change the state of a substance is called its latent heat.
Latent heat does not raise (or increase) the temperature. But latent heat has always to be supplied to change the state of a substance .The word ‘latent’ means ‘hidden’.
The latent heat which we supply is used up in overcoming the forces of attraction between the particles of substance during the change of state. Latent heat does not increase the kinetic energy of the particles of the substance, so the temperature of a substance does not rise during the change of state.

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What is physics

Posted by Anurag Kumar 4 years, 1 month ago

ICSE & ISC > Class 09 > Physics

1 answers

Aditya Kesarwani 3 years, 10 months ago

Physics is a branch of science that study the nature and its laws and also their implications in our daily life

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What is parsec and parallax

Posted by Tanuja Dixit 4 years, 1 month ago

ICSE & ISC > Class 09 > Physics

1 answers

Yogita Ingle 4 years, 1 month ago

Parsec (pc)

1 pc = 3.08 x 10¹⁶ m

One parsec (pc) is the distance to a star that subtends and angle of 1 arc second at an arc length of 1 AU.

Parallax is “the best way to get distance in astronomy,” said Mark Reid, an astronomer at the Harvard Smithsonian Center for Astrophysics. He described parallax as the “gold standard” for measuring stellar distances because it does not involve physics; rather, it relies solely on geometry.

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Vernier callipers

Posted by Devansh Devansh 4 years, 1 month ago

ICSE & ISC > Class 09 > Physics

1 answers

Yogita Ingle 4 years, 1 month ago

The Vernier calliper is used to measure the length or thickness of an object with great accuracy. It was invented by Pierre Vernier in 1630. It can measure length less than 1 mm.
A Vernier calliper consists of a fixed main scale or ordinary scale, a sliding Vernier scale, movable jaws, and a tail.
Parts of a Vernier Calipers

Main Scale: The main scale consists of a steel metallic strip graduated in centimeters at one edge and in inches at the other edge . It consists of a fixed external jaw and a fixed internal jaw.
Vernier Scale: A vernier scale slides on the strip. It can be fixed in any position by the retainer. On the Vernier scale, 0.9 cm is divided into ten equal parts. It consisits of a fixed external jaw and a fixed internal jaw.

External Measuring Jaws: The outer measuring jaws (one of the main scale and the other of the vernier scale) helps to take the outer dimension of an object

Internal Measuring Jaws: The inner measuring jaws (one of the main scale and the other of the vernier scale) helps to take the inner dimension of an object.
Retainer: The retainer helps to retain the object within the jaws of the Vernier calipers to fix firmly.
Depth Measuring Strip: The depth measuring strip (prong) helps to measure the depth of an object.

Least Count: The smallest length that can be measured accurately with a device is called the least count of that device. The least count of a Vernier calliper is known as the Vernier constant.

The least count or the smallest reading which you can get with the instrument can be calculated as:

Least Count = One main scale division - one Vernier scale division ------------ (i)

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What do you mean by green house effect

Posted by Hemant Raj 4 years, 1 month ago

ICSE & ISC > Class 09 > Physics

1 answers

Gaurav Seth 4 years, 1 month ago

The greenhouse effect is the trapping of the sun's heat in the atmosphere of a planet by gases in that atmosphere. The green house effect happens because of so-called greenhouse gases, which includes carbon dioxide, methane, water vapor & other. The greenhouse effect is hugely significant.

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What is visocity

Posted by Sai Tarun Achary 4 years, 1 month ago

ICSE & ISC > Class 09 > Physics

1 answers

Gaurav Seth 4 years, 1 month ago

Viscosity is the property of a fluid that resists the force tending to cause the fluid to flow.
It is analogous to friction in solids.

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A object of mass50kg is placed at point A and droped at point B.find change in gravitational potential energy from point A to B

Posted by Samriddhi Singh Kashyup 4 years, 2 months ago

ICSE & ISC > Class 09 > Physics

1 answers

Tushar Mathur 4 years, 1 month ago

P.E.=mgh So at point A , P.Ea=50×g×h of A from ground And at point B ,P.Eb=50×g×h of B from ground Change in P.E= P.Ea-P.Eb 50g(ha-hb)from the ground

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What is pitch

Posted by Faiz Ahmad 4 years, 2 months ago

ICSE & ISC > Class 09 > Physics

1 answers

Atulya Shreshth Rao 4 years, 1 month ago

The character of sound which differentiate the shriller sound from faint one .It depends upon frequency of sound(Hope this wil help you).

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What is electric circuit

Posted by S Mahadevaswamy 4 years, 2 months ago

ICSE & ISC > Class 09 > Physics

1 answers

Samriddhi Singh Kashyup 4 years, 2 months ago

The path of electric current is called electric. Circuit

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Electricity and circuit lessons questions

Posted by S Mahadevaswamy 4 years, 2 months ago

ICSE & ISC > Class 09 > Physics

0 answers

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what is relative density

Posted by Hifazat Ali 4 years, 3 months ago

ICSE & ISC > Class 09 > Physics

2 answers

Yogita Ingle 4 years, 3 months ago

Relative Density

The relative density of a substance is the ratio of its density to that of water.
Relative density is a ratio so it has no unit.
Density = mass/volume
Relative density = density of substance/density of water

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Hifazat Ali 4 years, 3 months ago

relative density is the ratio of the density of object with the density of water that is 1 g/cm^3

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Why temperature of moon fall down to -190 degree Celsius?

Posted by Preet Rajput 4 years, 4 months ago

ICSE & ISC > Class 09 > Physics

1 answers

Hifazat Ali 4 years, 3 months ago

because it has no atmosphere as the earth has and it does not consist carbon dioxide that can trap the sun's light and keep the temperature constant .

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Define friction with an example

Posted by Santosh Kumar Sethi 4 years, 5 months ago

ICSE & ISC > Class 09 > Physics

4 answers

Devansh Devansh 4 years, 1 month ago

A force that act against a body that is in motion

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Hifazat Ali 4 years, 3 months ago

frictional force is the necessary evil by which any body or object opposes any kind of motion in the opposite direction .

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Kenz Lion 4 years, 5 months ago

Friction is the phenomenon in which two surfaces rub against each other

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Yogita Ingle 4 years, 5 months ago

Friction describes a force that acts against motion. Friction is what slows down a vehicle, the lower the friction, the slower it slows down a vehicle

Example: a boy sliding on a slide

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Who is quantity of work

Posted by Shani Agrahari 4 years, 5 months ago

ICSE & ISC > Class 09 > Physics

2 answers

Hifazat Ali 4 years, 3 months ago

by the way the question is wrong work is ascalar quantity but the force and displacement both r vector quantity

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Shani Agrahari 4 years, 5 months ago

Scalar quantity

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Doesthe body move in all these sitution

Posted by Akshaya Achu 4 years, 5 months ago

ICSE & ISC > Class 09 > Physics

0 answers

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Define heat.write the SI unit and CGS unit of heat

Posted by Swapna Tripathydash 4 years, 6 months ago

ICSE & ISC > Class 09 > Physics

4 answers

Vedant Motewar 3 years, 11 months ago

Hear is form of energy. Which creates a sensation of warmth. It's sI unit is joule and C. G. S unit is calorie. And heat transfered by three ways. And it is always flows from region of high temperature to region of cold temperature

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Hifazat Ali 4 years, 3 months ago

heat is a energy which creates a sensation of warmth . its Sl unit is joule in CGS its unit is calorie

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Hacker A 4 years, 4 months ago

Heat is a form of energy that can do work. It causes sensation of warmth means you can feel which is hottest and hot by this energy. The S.I unit is joule and C.G.S unit is calorie. It can be transferred from one body to another but the condition is it always flow from high temperature to low temperature

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Yogita Ingle 4 years, 6 months ago

Heat is a form of energy that gives sensation of warmth. The SI unit of heat is joule. In C.G.S system, the unit of heat is calorie. 1calorie = 4.2 Joule. Heat always flow from hotter body to colder body.

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What is Newton second law of motion

Posted by Mk Education 4 years, 6 months ago

ICSE & ISC > Class 09 > Physics

2 answers

Vedant Motewar 3 years, 11 months ago

Newton's law of motion is about the momentum. The rate of change of momentum is directly promotional to the net external force acting on the body.

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Vivek Yadav 4 years, 4 months ago

Formula - F=Ma

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Give some notes of friction

Posted by Sanju Kumar Singh 4 years, 6 months ago

ICSE & ISC > Class 09 > Physics

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Find the decrease in in barometric height when it is at 107m above sea level

Posted by Meenu Chauhan 4 years, 6 months ago

ICSE & ISC > Class 09 > Physics

0 answers

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How does acceleration due to gravity change with the shape of earth

Posted by Yash Duhan 4 years, 7 months ago

ICSE & ISC > Class 09 > Physics

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If action is always equal to the reaction, explain how a horse can pull a cart????????

Posted by Gaurav Jha 4 years, 7 months ago

ICSE & ISC > Class 09 > Physics

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you have a bag of cotton and an iron bar each indicating a mass of 100kg when measured on a weighing machine.In reality one is heavier than other. Can you say which one is heavier and why?

Posted by Sohan Shah 4 years, 8 months ago

ICSE & ISC > Class 09 > Physics

1 answers

Shubham Danu 4 years, 7 months ago

Yes,cotton is heavier than other

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What is light ?

Posted by Vip Prince Babu 4 years, 8 months ago

ICSE & ISC > Class 09 > Physics

6 answers

Green Sharma 4 years, 7 months ago

Light is a forn of energy which allows us to see the world around us. It is basically a non mechanical wave and does not compulsarily require a medium to travel.

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Santhosh Kumar 4 years, 7 months ago

Light is a ray which comes from sun or any other object

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Samrat Yaduvanshi 4 years, 8 months ago

Light is a form of energy which helps us a seeing object

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Samrat Yaduvanshi 4 years, 8 months ago

Light is a form of energy

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Shakti Maurya 4 years, 8 months ago

Light is a form of energy which give us sensation of vision to our eyes.

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Yogita Ingle 4 years, 8 months ago

Light: Light is a form of energy which helps us in seeing objects. When light falls on an object, some of the light gets reflected. The reflected light comes to our eyes and we are able to see an object.

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When is body said to be at rest

Posted by Jiyam Jain 4 years, 8 months ago

ICSE & ISC > Class 09 > Physics

4 answers

Swapna Tripathydash 4 years, 6 months ago

A body is said to be rest if it does not changes its position and with respect to its time.

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Ranjay Singh 4 years, 8 months ago

A body is said to be at rest when its does not change its position with respect to time

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Samrat Yaduvanshi 4 years, 8 months ago

A body cannot change their position are called rest

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Yogita Ingle 4 years, 8 months ago

A body is said to be at rest if it does not change its position with respect to a fixed point in its surroundings. If the body changes its position with respect to a fixed point in its surroundings, then body is said to be in motion.

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sir derive the microscopic structure of the cell ?

Posted by Gopal Mohanta 4 years, 8 months ago

ICSE & ISC > Class 09 > Physics

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Motion

Posted by Rajnish Mishra 4 years, 8 months ago

ICSE & ISC > Class 09 > Physics

3 answers

Samrat Yaduvanshi 4 years, 8 months ago

Force is defined as the external cause of body change or try to change their position .

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Rishi Kumar Agrahari 4 years, 8 months ago

A BODY IS SAID TO BE IN MOTION WHEN ITS POSITION CHANGES CONTINUOUSLY WITH RESPECT TO A STATIONARY OBJECT TAKEN AS REFERENCE POINT

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Ali Faisal 4 years, 8 months ago

Ghyt

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What is motion and it's laws of motion

Posted by Shivanand Pandey 4 years, 8 months ago

ICSE & ISC > Class 09 > Physics

2 answers

Rishi Kumar Agrahari 4 years, 8 months ago

MOVEMENT OF A BODY OR OBJECT IS CALLED MOTION AND ITS LAW FIRST LAW IS A BODY AT REST WILL REMAIN AT REST AND A BODY IN THE MOTION WILL REMAIN AT THE MOTION IN A STRAIGHT LINE WITH A UNIFORM SPEED ,UNTESS IT IS COMPELLED BY AN EXTERNEL FORCE TO THE CHANGE ITS STATE OF REST OR OF UNIFORM MOTION NEWTON SECND LAW OF MATION=THE RATE OF CHANGE OF MOMENTUM OF A BODY IS DIRECTLY PROPORTIONAL TO THE APPLIED FORCE ,AND TAKEN PLACE IN THE DIRECTIONIN WHICH THE FORCE ACT. NEWTON THIRD LAW OF MOTION =TO EVERY ACTION THERE IS AN EQUAL AND OPPOSITE REACTION.

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Yogita Ingle 4 years, 8 months ago

Newton gave three laws of motion that describe the motion of bodies. These laws are known as Newton's Laws of motion.
The first law of motion is stated as: An object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force.
Newton's first law of motion gives us a definition of force. It says that Force is something that changes or tends to change the state of rest or uniform motion of a body.
The second law of motion states that: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.
Newton's third law of motion states that: Whenever a body exerts a force on another body, the second body exerts an equal and opposite force on the first body

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