How Can We See Black Holes ?

How Can We See Black Holes?   Can we see a Black holes..? if you have this question in your mind than here is answer for you.   Though we cannot "see" a black hole itself (since not even light can escape the hole's gravitational field), we may see the hole's...

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10 Mind-Blowing Facts About Black Holes

10 Mind-Blowing Facts About Black Holes   Here are 10 interesting facts about black holes 1. It was John Mitchell who actually first proposed the idea of ‘dark stars’ or object. Later, in 20th century the term ‘black hole’ was coined. 2. Black holes...

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Why does water freeze from the top to the bottom..?

Why does water freeze from the top to the bottom..?? The answer lies in a very peculiar property of water.  As you guessed, the density of water of water increases as the temperature is lowered, but below 4oC this trend is reversed.   Here is a graph...

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What Causes Optical Illusions?

What Causes Optical Illusions? These yellow and blue blocks appear to move one after the other but actually not..!! In simple terms, an optical illusion is caused by the structure of both the eye and brain and how they work together. Because of the anatomical...

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Voltage Transformer Basics

One of the main reasons that we use alternating AC voltages and currents in our homes and workplace’s is that AC supplies can be easily generated at a convenient voltage, transformed (hence the name transformer) into much higher voltages and then distributed around...

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What is the use of integration and differentiation?

What is the use of integration and differentiation? Let us get into this with all interest. Yes integration is a reverse process of differentiation. First let us put the question why do we need such a mathematical process called integration. Actually integration is nothing but the summing up of a lot, some million and million items....

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Why is air invisible..?

Air is invisible because it is a gas, and gas particles generally allow light to pass through them because they are so spread apart. Gases expand to fill any container they are in, as they do not hold a shape; therefore, it is usually easy to see through the...

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Explain why the moon has no atmosphere..?

Moon has no atmosphere because the value of acceleration due to gravity ‘g’ on the surface of moon is small. Therefore, the value of escape velocity on the surface of moon is small. The value of r.m.s. velocity of the molecules of different gases is much above the value of escape velocity on moon. That is why all the molecules of gases escaped...

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What is geostationary satellite?

What is geostationary satellite?   A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east)....

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What is force?

In physics, a force is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate...

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What Is the Difference Between Mass and Weight?

Comparison of Mass and Weight Mass is a property of matter. The mass of an object is the same everywhere,Weight depends on the effect of gravity. Weight varies according to location. Mass can never be zero.Weight can be zero if no gravity acts upon an object, as in space. Mass does not change according to location.Weight increases or decreases...

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Does a fully charged battery weight more than when it's empty?

Does a fully charged battery weight more than when it's empty? Yes because of E= mc*2 When you test the electrolite in a lead acid battery,as the battery charges the sulphuric acid becomes denser which gives it more mass so it "weighs" more. Try...

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Is the number 0 even or odd..?

Is the number 0 even or odd..?    A number is even if it is divisible by 2 without a remainder. For Example 8 is even since 8 divided by 2 is 4, and 12 is even since 12 divided by 2 is 6, but 7 is not even since 7 divided by 2 is 3 with a remainder of...

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What would happen if Earth stopped spinning ?

What would happen if Earth stopped spinning ..??     As you probably know, the Earth is rotating on its axis. This gives us day and night. Of course it’s impossible, but what would happen if the Earth stopped spinning? Remember, this isn’t possible,...

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Interesting Facts About Earth

Interesting Facts About Earth   Earth is the place that each person calls home. It is home to over six billion people and around 8.7 million different species. While everyone lives on Earth, there are many interesting facts that people do not know about...

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In the earth where the gravity of the earth becomes zero..?

In the earth where the gravity of the earth becomes zero..? In a perfectly-shaped sphere, with a smooth surface, and composed of exactly the same substance with the same density throughout it, the force of gravity is zero at the exact center of the sphere. That does NOT mean that 'gravity becomes zero' at the center. It means that at the center,...

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Can you have zero gravity conditions on Earth..?

 Can you have zero gravity conditions on Earth..? Gravity will always be there, but you can set up an arrangement where you will appear to be weightless. Such an arrangement is in a plane that flies up and swoops down so that its path is a circle standing on edge. You will hang in the plane and appear to be weightless. What is actually...

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Some Amazing Facts Collection part 2

Some Amazing Facts Collection part 2 -------------------------------------------------------------- 1.The diameter of a proton is approximately 0.000000000001 mm (1/25,000,000,000,000 in). 2.The lightning bolt is 3 times hotter than the Sun. 3.If an item moves very, very fast, it becomes smaller and heavier. 4.The bark of the redwood tree is...

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Which Came First, The Chicken Or The Egg?

Chickens, as a species, became chickens through a long, slow process of evolution. At some point, a chicken-like bird produced an offspring that, due to some mutation in its DNA, crossed the threshold from mere chicken likeness into chicken actuality. That is to say, a proto-chicken gave birth to a real-life official chicken. And since that real-life...

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Why 0! is equal to 1 ..??

Why 0! is equal to 1 ..?? We Know , n! = n x (n-1)! Dividing both sides by n , We get n!/n = n x (n-1)!/n  Or, n!/n = (n-1)! Or, (n-1)! = n!/n Now , Putting n=1 , We get (1-1)! = 1!/1 i.e. 0! = 1    ...

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What would happen if you drilled a tunnel through the center of the Earth and jumped into it?

What would happen if you drilled a tunnel through the center of the Earth and jumped into it..? Want to really get away from it all? The farthest you can travel from home (and still remain on Earth) is about 7,900 miles (12,700 kilometers) straight down, but you'll...

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Funniest Math/Science Questions and answers

Q. How can you drop a raw egg onto a concrete floor without cracking it? A. Concrete floors are very hard to crack! Q. If it took eight men ten hours to build a wall, how long would it take four men to build it? A. No time at all it is already built. Q. If you had three apples and four oranges in one hand and four apples and three oranges...

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Math Puzzle Questions

1. What is come in place of question mark (?) in the following series? (a) HS (b) IT (c) IS (d) HT Solution: 2. If A is substituted by 4, B by 3, C by 2, D by 4, E by 3, F by 2 and so on, then what will be total of the numerical values of the letters...

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