IM... POSSIBLE WORDS

BLACK LIGHT
Can you see things with invisible light? Yes, you can.. The ultraviolet rays are invisible. When it is shone on an object quoted with florescent chemicals, they emit back light and appear bright. For example, the security thread of a dollar bill glows green under black light, a safe guard against counterfeiting . So light can be invisible and black.

SOLID GAS OR DRY ICE.
Under high pressure and cold temperature, carbon-di-oxide gas directly becomes solid called dry ice. It is widely used in fire extinguishers which emit them as white powder.

DYNAMIC EQUILIBRIUM:
How can a thing be at rest and moving at the same time? Imagine a queue is moving through a room. At a time, the room can accommodate only 10 persons. So the room always have 10 people, yet the people keep moving. This is dynamic equilibrium.

HOT ICE
Using vinegar and baking soda, one can make boiling ice like form to attract kids.

LIVING DEAD:
A dead virus can at any time come to life under suitable conditions. A lifeless seed can give birth to living plant also under suitable conditions.

WATER BLADE
A highly pressurized water jet can cut a metal. Machines are available to produce such a jet of water.

LIGHT GUN
A concentrated and highly intense light is called laser. The laser can act like a bullet , knife and an arrow.

Science and poem give birth to new and strange combination of words.

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LISSAJOUS FIGURES

Definition: "When a particle is subjected to two sine wave motion or two oscillatory motion at right angles, the particle describes lissajous figures". We know sine wave motion and circular motion is basically same. Hence we draw two circles A and B perpendicular to each other. The circle B rotates twice faster than circle A. That is, frequency of circle B is two times than that of A. A particle at the intersection of two circles is subjected to two sine wave motion A and B at 90 degree simultaneously. The particle will describe figures depending on the frequency and phase of A and B . In our case, the ratio of frequency is 1:2 and the two waves are in phase. To draw lissajous figures : A moving point in both the circles are chosen. Here we should remember; during the time taken by the circle A to complete one rotation, circle B completes two. Hence the points are marked on the circles according to their speed. Then straight lines

THE PARABOLA

A jet of water shooting from a hose pipe will follow a parabolic path. What is the so special about parabola. Y= x^2 Draw a graph for the above equation. It will result in a parabola. This parabola is also called unit parabola. Any equation involving square will yield a parabola. Example: Y = 2x^2 +3x+3 (also called quadratic equation) X= 2 and -2, both satisfies the equation 4 = X^2. Parabolic equations always have two solutions. Any motion taking place freely under gravity follows parabolic path. Examples: An object dropped from a moving train, A bomb dropped from flying plane, A ball kicked upwards. If a beam of light rays fall on the parabolic shaped mirror, they will be reflected and brought to focus on a point. This fact is made use of in Dish Antenna, Telescope mirrors, etc. Inverted parabola shape is used in the construction of buildings and bridges. Because the shape is able to bear more weight. A plane

CASINO'S GAME

Let us find out how the casino survives with mathematics. Say, your friend invite you for a game of dice. You must bet (wager) 2 dollars. If you roll 'six' you will get back 8 dollars. The game will go on for 30 rounds. All sounds good. The probability of rolling 'six' is 1/6. Since the game will be played for 30 times, the 'expected win' is 30*1/6 = 5. That is, you are expected to win 5 rounds out of 30. Hence your gain will be 5 * 8 =40 dollars. ok. This also implies that you will loose 25 rounds. Hence your loss will be 25*2 =50 dollars. Your net gain will be gain-less = 40-50 = -10 dollars. For 30 rounds, the loss is -10 dollars, Hence, for one round =-10/30 = -1/3 dollars. There will be a loss of -1/3 or 0.33 dollars per round. It is not a fair game. Let us make a simple formula to calculate 'Pay out per round\. The probability for a win = p The pay-out in case of win = V No. of rounds = n The expect

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