Oil or Greece are applied to the moving part of machine because to reduce heat ,friction , wear and tear in the machine,oil and grease can reduce the amount of friction, making it easier for parts to slide against one another, and reducing .....

With every stroke of the chalk piece it leaves some of the chalk on the board. This abrasion of the piece of chalk causes it to wear down. This is because of frictional .....

When we rub our hairs with a comb, and then try to attract small pieces of paper, they're attracted by the comb. The pieces of the paper were not electrified before they were attracted. Then they might be neutral. Why does the comb attract the .....

We don’t feel the pull from each other in daily life because our pull is very very small. But the Earth is huge and so its pull is also huge and that’s why everything falls down towards it. This pull of Earth on every object is called .....

Gravitational forces occur due to mass and magnetism occurs due to moving charges.

Magnetic forces can be either attractive or repulsive, but gravitational forces are always .....

You can’t see them, but forces make the world go round. Friction happens when two things rub against each other. Friction makes things slow down. It can also warm them up. Try rubbing your hands together. Are your hands warmer? Gravity .....

In everyday language we use 'accelerate' to mean speeding up and 'decelerate' to mean slowing down. Acceleration is a vector quantity that is defined as the rate at which an object changes its .....

Let us take an example of a moving bus. If it covers 2m in every 1 second, this is uniform velocity i.e .....

Disadvantage of friction is it wastes energy. In any type of vehicles as a car, boat or airplane-excess friction means that extra fuel must be used to power the .....

Friction can cause problems or be a nuisance that you try to minimize. Makes movement difficult: Any time you want to move an object, friction can make the job more difficult. Excess friction can make it difficult to slide a box across .....

Whenever an object moves against another object, it feels frictional forces. These forces act in the opposite direction to the movement. Friction makes it harder for things to .....

Have you ever thought about why the plastic bags from your lunches stick to your clothing or why lightning strikes? Well, these are just some of the many examples of electrostatic forces in our everyday .....

You might have played with magnet. If you put iron near to magne it attract iron. And if you put magnet near to another it attract or repel according to pole. So the mechanical force exerted by a magnetic field upon a magnetic pole placed in .....

The gravitational force is a force that attracts any two objects with mass. We call the gravitational force attractive because it always tries to pull masses together, it never pushes them apart. Every object, including you, is pulling on .....

Which part of the answer did you not understand? Please clarify so that we can help you with your .....

Audible sounds are classified into two groups, namely musical sounds and noise. A musical sound is that in which the vibrations of the sounding body are periodic, follow each other regularly and rapidly, so as to .....

Use the formula,   where,  A= area of the circle use = .....

We have given , ABC is an equilateral triangle. And  height =  9cm. To find area, we need base =  BC,  In triangle ADC, Let AC = b then DC =  b / 2. using pythagoras theorm,  AC2=  AD2 + CD 2 or, .....

We have given,  Principal = P = Rs.1550. Amount = A = Rs. 2015 time  = T = 3 yrs We need to find rate   = R = ?  We have formula, I = A - P    = Rs.2015 -  RS.1550 = .............find it. Finally, R .....

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Cynobacteria Earth is estimated to be about 4.5 billion years old, and for much of that history it has been home to life in one weird form or another. Indeed, some scientists think life appeared the moment our planet's environment was stable .....

To add  3a2 - 4ab - 2b2 and 7ab - 4a2 + 6b2  We need to arrange like terms as follows; 3a2 - 4ab - 2b2 + 7ab - 4a2 + 6b2 =  3a2 - 4a2 + 7ab- 4ab - 2b2  + 6b2 Now you can add or subtract as according .....

Here I give you an example [ for question 1.a)], to convert binary to decimal. Loke it carefully  and try your question;  

Find the decimal value of 1110012:

No, ammonia is not a supporter of combustion but it is a combustable substance. For e.g In burning of firewood mainly two things are involved while burning i.e the firewood itself and the oxygen gas. Here firewood is a combustable substance and .....

Pungent smell is a sharp and strong smell that is very .....

Look at the given example

So, equivalent fractions are fractions that look different but show exactly the same amount.  

You can make equivalent fractions by multiplying or dividing the numerator and denominator by .....

d) Here we have given a triangle whose angles are 1200 , x and  x. We need to find the value of x. For this we use a property of triangle " sum of angles of a triangle is 180o ". So,     1200 + x .....

Sorry for the interruption. From next time, we will send equations in the linear form for the .....

The concentration of minerals in the soil is very low. They dissolve in water and move around the soil in solution. Root hair cells are adapted to absorb the water out of soil by osmosis, they have a large surface area, thin walls .....

Fuses, by design are a one-time-use protective device - once they are used ("burn out"), they're worthless. That is why homes typically use circuit breakers: a breaker acts similarly to a fuse in that it opens a .....

Commonly used material are copper, zinc, aluminium. The heat developed by excess current will melt the fuse wire. Eg. At full load your house/motor/ appliance draws a specific amount of current lets say 5Amps. So fuse wire is set to a bit higher .....

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Electric heaters have been around for decades as a source of heat in homes to provide warmth to us. One of the reason for their popularity is because of lower cost to purchase and easy maintenance compared to other sources of heat. They are .....

Solar energy is used in the following two natural process: 1. Water cycle Heat enery from the sun is used in this process. 2. Photosynthesis in plants. Light enery from the sun is used in this .....

Yes Nidika the consumption of non-renewable energy can be reduced in our country by the following two methods. 1. By using hydroelectricity in factories industries companies in place of petroleum products. 2. By using solar energy. 3. By using .....

Yes Nidhika you know that Nepal is a tourism country. You might also know that fossils fuel are non renewable source of energy and they produce pollution. If the country gets polluted the tourism industry of our country may get affected. Another .....

As you can see, fossil fuels can be used for multiple purpose. It can be carried from one place to another place easily. Also, it is a cheap source of .....

Here I give you some points, please read that carefully.  

1. Hydroelectricity is a renewable energy source.

Hydroelectricity uses the energy of running water, without reducing its quantity, to produce electricity. Therefore, all .....

Hydropower is an example of renewable sources of energy. Hydropower is more useful than coal because of the following reasons. 1. Hydroelectricity is a renewable energy source. 2. Hydroelectricity increases the stability and reliability of .....

As we know,  Pressure =  force /  area           Now write units of force  and area,  N / m2 = Kg m / s2 /  m2 From here you can see, the fundamentals units in pressure are , mass ( .....

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Did this answer helop you? Please let us know if you do not .....

You may be familiar with the minerals.  Can you name some minerals? Gold, silver, graphite, diamond etc. are some of the minerals. An oil derived from these minerals is called mineral oil.  Mineral oil has a many advantages. Two .....

The SI unit of length is .....

The SI (Systeme International) units have made scientific calculations easier.  Standardization allows people in different places and different countries to use the same units, avoid mistakes, understand each other more easily. The .....

Let me know if you want to know more about .....

We have to simplify this, For this we need to factorise both numerator and denomerator my mid - term factorization. i.e,   [3 x 2 - 5 x - 12] / [ 3 x 2 + x - 4] = [3 x 2 - ( 9 - 4 ) x - 12] / [ 3 x 2 + ( 4 - 3 )x - 4] Now open .....

Given power (P) = +2D  this means, lens is convex lens   focal length (f) = 1/P => f = 1/2D => f = 0.5m Or, f = 50 cm So the lens is convex with focal length 50 .....

The list of five wonders of the world goes like this: The Great Wall of China The Taj Mahal The Great Pyramid of Giza Golden Gate Bridge  The Roman Colosseum, .....

Sugarcane Classification  

Kingdom: Plantae Sub-kingdom: Tracheobionta Super-division: Spermatophyta Division: Angiosperm Class:Monocot Sub-class: Commelinidae Order: Poales Family: Poaceae Genus: Sachharum .....