Wednesday, March 18, 2015

WORK AND ENERGY

Do you know that you are working when you are playing?

To a scientist, work is any kind of action that uses energy.

Energy is needed to do all types of work—for example, to throw a ball into the air and to catch it. Energy is needed because something does not move unless you push or pull it. And it doesn’t stop moving unless something else slows it down. When you catch a ball, your hand can feel the ball pushing to continue moving. Inertia is a basic characteristic of an object as it continues to stay at rest or continues to move.
If you want to start moving something or stop it from moving, you need to push or pull it. These pushes and pulls are called forces. Forces are needed to overcome inertia. Forces are produced by applying energy. The more force applied, the more energy used and the more work done.

Energy for lifting

When you lift a heavy box, potential energy changes to kinetic energy in your muscles. You use more energy and do more work when you move a heavy box than when you lift a lighter box for the same distance. You do more work when you lift a box up to a high shelf than when you lift it onto a low shelf. If you carry a pile of books weighing 22 pounds (10 kilograms) up a flight of stairs, you do twice as much work than if you carried an 11-pound (5-kilogram) pile up the same flight of stairs. Since work is equal to force times distance, the energy you use is equal to the weight of the books times the distance you moved.



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Paddle Wheel Boat Plans How to Build a Paddle Wheel Boat By P A Baumeister

Paddle Wheel Boat Plans - How to Build a Paddle-Wheel Boat By P. A. Baumeister

The paddle-wheel boat, illustrated herewith, was built in the spare time I had on rainy afternoons and Saturdays, and the enjoyment I derived from it at my summer camp more than repaid me for the time spent in the building. The materials used in its construction were:
  • 2    side boards, 14 ft. long, 10 in. wide and 7/8 in. thick.
  • 2    side boards, 14 ft. long, 5 in. wide and 7/8 in. thick.
  • 1    outside keel board, 14 ft. long, 8 in. wide and 7/8 in. thick.
  • 1    inside keel board, 14 ft. long. 10 in. wide and 7/8 in. thick.
  • 120      sq. ft. of tongue-and-groove boards, 3/4 in. thick, for bottom and wheel boxes.
  • 1    piece, 2 in. square and 18 in. long.
  • 4    washers.
  • 2    iron cranks.
  • 10    screweyes.
  • 30    ft. of rope.
  • Nails.
The dimensions given in the drawing will be found satisfactory, but these may be altered to suit the conditions. The first step will be to cut and make the sides. Nail the two pieces forming each side together and then cut the end boards and nail them to the sides. Lay this framework, bottom side up, on a level surface and proceed to nail on the bottom boards across the sides. The ends of these boards are sawed off flush with the outside surface of the sides after they are nailed in place. The material list calls for tongue-and-groove boards for the bottom, but plain boards can be used, although it is then difficult to make the joint water-tight. When the tongue-and-groove boards are used a piece of string, well soaked in white lead or paint and placed in the groove of each board, will be sufficient to make a tight joint.
Having finished the sides and bottom, the next step will be to fasten on the bottom keel. Adjust the board to its position and nail it in the center part where it lies flat on the bottom boards, then work toward the ends, gradually drawing it down over the turn and nailing it down. If the keel board cannot be bent easily, it is best to soak it in hot water where the bend takes place and the wood can then be nailed down without the fibers breaking. The inside keel is put on in the same manner, but reversed.

The Boat As It Appears without the Spring and Running Board and Used as a Pleasure Craft or for Carrying Freight, the Operator Facing in the Direction of the Boats Travel

The next procedure is to make the paddle wheels. The hub for each [106] wheel is made of a 2-in. square piece of timber, 9 in. long. Trim off the corners to make 8 sides to the piece, then bore a 3/4-in. hole through its center. The 8 blades of each wheel, 16 in all, are 17 in. long, 6 in. wide and 3/4 in. thick. One end of each blade is nailed to one side of the hub, then it is braced as shown to strengthen the wheel.
 
Detail Drawing of the Boat and One of the Paddle Wheels. All the Material Required for the Construction is Such That can be Cut and Shaped with Ordinary Tools Found in the Home Workshop

The cranks are made of round iron, 3/4 in. in diameter, and they are keyed to the wheels with large nails in the manner shown. I had a blacksmith shape the cranks for me, but if one has a forge, the work can be done at home without that expense. The bearings for the crankshafts consist of wood, although it is preferable to use for this purpose two large iron washers, having a hole slightly larger than the diameter of the shaft, and drill holes in their rims so that they can be screwed to the wheel-box upright as shown. The bearings thus made are lubricated with a little lard or grease.
 
Detail of Paddle-Wheel Fastening, the Springboard Construction and the Fastening for the Rudder Control

The paddle-wheel boxes are built over the wheels with the dimensions given in the drawing, to prevent the splashing of water on the occupants of the boat.
The trimmings for the boat consist of three seats, a running board and a springboard. The drawings show the location of the seats. The springboard is built up of 4 boards, 3/4 in. thick, as shown, only nailing them together at the back end. This construction allows the boards to slide over each other when a persons weight is on the outer end. The action of the boards is the same as of a spring on a vehicle.
It is necessary to have a good brace across the boat for the back end of the springboard to catch on—a 2 by 4-in. timber being none too large. At the point where the springboard rests on the front seat there should be another good-sized crosspiece. The [107] board can be held in place by a cleat and a few short pieces of rope, the cleat being placed across the board back of the brace. A little diving platform is attached on the outer end of the springboard and a strip of old carpet or gunny sack placed on it to prevent slivers from running into the flesh. In making the spring and running board, it is advisable to make them removable so that the boat can be used for other purposes.
The boat is steered with a foot-operated lever, the construction of which is clearly shown. For the tiller-rope guides, large screweyes are used and also for the rudder hinges, the pin of the hinge being a large nail. The hull can be further strengthened by putting a few angle-iron braces either on the in or outside.
To make the boat water-tight will require calking by filling the cracks with twine and white lead or thick paint. The necessary tools are a broad, dull chisel and a mallet. A couple of coats of good paint, well brushed into the cracks, will help to make it watertight as well as shipshape. The boat may leak a little when it is first put into the water, but after a few hours of soaking, the boards will swell and close the openings.
This boat was used for carrying trunks, firewood, rocks, sand, and for fishing, and last, but not least, for swimming. The boat is capable of carrying a load of three-quarters of a ton. It draws very little water, thereby allowing its use in shallow water. It has the further advantage that the operator faces in the direction the boat is going, furnishing the power with his hands and steering with his feet.

THE BOY MECHANIC - BOOK 2
1000 THINGS FOR BOYS TO DO
HOW TO CONSTRUCT DEVICES FOR WINTER SPORTS, MOTION-PICTURE CAMERA, INDOOR GAMES, REED FURNITURE, ELECTRICAL NOVELTIES, BOATS, FISHING RODS, CAMPS AND CAMP APPLIANCES, KITES AND GLIDERS, PUSHMOBILES, ROLLER COASTER, FERRIS WHEEL
AND
HUNDREDS OF OTHER THINGS WHICH DELIGHT EVERY BOY WITH 995 ILLUSTRATIONS
PUBLISHED 1915, BY H. H. WINDSOR CHICAGO
POPULAR MECHANICS CO. PUBLISHERS
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HOW DOES WIND POWER WORK

The wind has been a source of energy for thousands of years.
Before the development of the steam engine, most ships relied on wind power to fill their sails and push them along. Windmills were used to turn grindstones and pump water.
Now scientists are turning to wind power again. This time they are using it to generate electricity.
Windmills have been used to produce electricity since the early 1900’s. It is easy to produce electricity from a wind turbine. This is simply a windmill that converts the kinetic energy of the wind into electricity.
Small wind turbines are used by farmers in remote parts of Australia and North America. In wide, open spaces, these turbines can make some of the electricity that farmhouses need. However, the winds are sometimes so strong that they damage the turbines and put them out of action.
Engineers have designed many different kinds of wind turbines to try to solve this problem. Some turbines look like old-fashioned windmills, with four blades, or sails. Other, more modern ones have two blades like those of an aircraft propeller.

In North America, this type of traditional windmill is used to pump water.

One of the largest wind turbines in the world stands in Hawaii, in the Pacific Ocean. It has two blades 165 feet (50 meters) long on top of a high tower. There is a smaller turbine on Orkney, off the coast of Scotland. It can generate enough electricity for about 1,000 homes. Most wind turbines are mounted on a cap, or swivel, on top of a tower. This means that they can be turned to face the wind when its direction changes.
A huge power station driven by wind has been built in the Mojave Desert in California. Its owners call it a “wind farm.”  Hundreds of wind turbines are arranged in rows and all are linked together by wires. The electricity they produce is supplied to the California power pool.
These wind turbines supply electricity to homes and factories.
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LADIES FINGER PACHADI � �ெ� �்� �ை� �்� �� �� �் � �� �்� �� �� �


LADIES FINGER PACHADI. வெண்டைக்காய் பச்சடி.

LADIES FINGER PACHADI :-
NEEDED :-
LADIES FINGER - 250 GRAMS.
BOILED THUVAR DHAL - 1 CUP
BIG ONION - 1 NO CHOPPED
TOMATO - 1 NO CHOPPED.
GREEN CHILLIES - 2 NOS. SLIT OPEN
TAMARIND - 1 AMLA SIZE BALL
SALT - 1 TSP
CHILLI POWDER - 1 TSP
CORRIANDER POWDER - 2 TSP
TURMERIC POWDER - 1 PINCH
CURRY LEAVES - 1 ARK
OIL - 3 TSP.
MUSTARD - 1 TSP
ORID DHAL - 1/2 TSP
JEERA - 1/2 TSP
ASAFOETIDA - 1/8 INCH PIECE.

METHOD :-
WASH AND CHOP THE LADIES FINGER. SOAK TAMARIND AND SALT IN ONE CUP WATER. HEAT OIL IN A PAN . ADD MUSTARD .,WHEN IT SPLUTTERS ADD ORID DHAL., JEERA., ASAFOETIDA. THEN ADD ONION., LADIES FINGER ., CURRY LEAVES AND SAUTE WELL. THEN ADD TOMATOES. TURMERIC POWDER., CHILLI POWDER., DHANIYA POWDER. SQUEEZE AND TAKE THE TAMARIND PULP AND ADD IT IN THE PAN. ADD ENOUGH WATER AND BRING TO BOIL. AFTER 5 MINUTES ADD THE BOILED THUVAR DHAL AND FURTHER COOK FOR 5 MINUTES. THEN REMOVE FROM FIRE AND SERVE HOT WITH PLAIN RICE ., SAMBAR RICE., CURD RICE., OR DOSAS OR IDDLIES.

வெண்டைக்காய் பச்சடி:-
தேவையானவை:-
வெண்டைக்காய் - 250
வேகவைத்த துவரம் பருப்பு - 1 கப்
பெரிய வெங்காயம் - 1 பொடியாக அரிந்தது
தக்காளி - பொடியாக அரிந்தது.
பச்சை மிளகாய் - 2 இரண்டாக கீறியது
புளி - 1 நெல்லி அளவு
உப்பு - 1 டீஸ்பூன்
மிளகாய்ப் பொடி - 1 டீஸ்பூன்
மல்லிப் பொடி - 2 டீஸ்பூன்
மஞ்சள் பொடி - 1 சிட்டிகை
கருவேப்பிலை - 1 இணுக்கு
எண்ணெய் - 3 டீஸ்பூன்
கடுகு - 1 டீஸ்பூன்
உளுந்து - 1/2 டீஸ்பூன்
ஜீரகம் - 1/2 டீஸ்பூன்
பெருங்காயம் - 1 சிட்டிகை.

செய்முறை :-
வெண்டைக்காய்களை நன்கு கழுவி துடைத்து நறுக்கவும். புளியையும் உப்பையும் நீரில் ஊறப்போடவும். பானில் எண்ணெயைக் காயவைத்து கடுகு போட்டு வெடித்ததும் உளுந்து., சீரகம்., பெருங்காயம் போடவும். பின் வெங்காயம்., வெண்டைக்காய்., கருவேப்பிலை போட்டு நன்கு வதக்கவும். பின் தக்காளி சேர்த்து., புளியை கரைத்து ஊற்றவும். மிளகாய்ப் பொடி., மல்லிப் பொடி., மஞ்சள் பொடி போட்டு தேவையான தண்ணீர் ஊற்றி கொதிக்க விடவும். 5 நிமிடம் கழித்து வேகவைத்த துவரம் பருப்பை சேர்த்து நன்கு வெந்ததும் 5 நிமிடம் கழித்து இறக்கி சாதம்., சாம்பார் சாதம்., தயிர் சாதம்., அல்லது இட்லி அல்லது தோசையுடன் பரிமாறவும்.
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WHAT ARE RENEWABLE ENERGY SOURCES

  • How do you keep cool in your house?

  • What sort of light do you use at night?

  • What appliances do you have in your home?

    Anything that gives you heat or light uses energy.

Household appliances use energy. In your notebook, make a list of all the things in your kitchen that use energy. What kind of energy do you think each appliance uses?
Most homes receive a supply of electricity. The electricity travels along cables and wires from a power station. At the power station, electricity is usually made from the energy released by burning fossil fuels, or by using nuclear fuel or waterpower.
Fossil fuels developed from the remains of prehistoric plants and animals. 
These fuels include coal, natural gas, and petroleum, from which we get oil. Wood, also, is often classified as a fossil fuel.
Besides electricity, fossil fuels are also used as a source of energy in our homes. Wood, coal, and oil can be burned to give heat. Natural gas can be burned for heating and cooking. Oil lamps and gasoline lanterns can be used as a source of light.
Other sources of energy in the home include solar energy and wind power.
Solar energy is energy from the sun, often gathered by solar panels. Solar energy can warm a house or heat up water. Wind power is often impractical unless there are strong, steady winds.

Fossil fuels are called nonrenewable sources

- of energy because, once they have been used up, they cannot be replaced. One day, all the coal, natural gas, and oil on earth may be used up. There will then be no more available.

Sources of energy that can be used over and over again are called renewable, or inexhaustible, sources.

Solar energy and forms of solar energy, like wind power and water power, are renewable energy sources. No matter how much we use them, there will always be plenty more.


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Albinism What is Albinism

Albinism is the lack of brown pigment - melanin, and a person with such property is called albino. The appearance of albinism can also be found in Africa.
Albinism may be partly inherited. Many people are not albinos, but passed the traits of albinism to their children.

What causes albinism?

The color of the skin, hair, eyes, etc.. in humans is the result of the interaction of various substances in the body.
One are the substances that form the basis of future color, and other are the enzymes that act on that basis.
If someone doesn’t has one of these two substances, or their relationship is disturbed, the result is albinism.
The name derives from the Latin word albus, meaning white.

Albinism symptoms

Albinos have pink eyes, because the red blood in the retina of the eye.
Albinos eyes are very sensitive to light. Thats why they keep flashing and keep partially lowered eyelids.
Hair and body hair of Albinos are white.
Even the tissues in the body are white, such as brain and spinal cord.

Albinism exists not only in humans but also in animals of all species. 
It was also found in birds.
Albinos are probably white mice, rats and rabbits, which we all know. There are people who have seen albinos squirrel and even a giraffe albino!

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Tuesday, March 17, 2015

Cell Diagram


Images gallery of cell diagram





Cell Diagram – Cell Diagram


Cell Diagram – Cell Diagram


Cells are the functional and structural units of all living organisms, being found in both plants and animals. However, animal cells are somewhat different from plant



Biology4Kids Cell Structure Raders BIOLOGY 4 KIDS


Biology4Kids Cell Structure Raders BIOLOGY 4 KIDS


Cells are the Starting Point All living organisms on Earth are divided in pieces called cells. There are smaller pieces to cells that include proteins and organelles.



Animal Cell Anatomy EnchantedLearning


Animal Cell Anatomy EnchantedLearning


Label the animal cell diagram using the separate page with a glossary of animal cell terms. Answers: Animal Cell Anatomy Label Me! Printout



CategoryCell diagrams Wikimedia Commons


CategoryCell diagrams Wikimedia Commons


Media in category "Cell diagrams" The following 96 files are in this category, out of 96 total.



Labeled Plant Cell Diagram Functions Buzzle


Labeled Plant Cell Diagram  Functions Buzzle


Labeled Plant Cell Diagram and Functions We are aware that all life stems from a single cell, and that the cell is the most basic unit of all living organisms.



Cell Models An Interactive Animation


Cell Models An Interactive Animation


Nucleolus: The prominent structure in the nucleus is the nucleolus. Cell Wall (plant cells only): Plant cells have a rigid,



Cell Diagram


Cell Diagram


The animal and plant cells are both eukaryotic cells. The structures are complex and they have differences with them that is major. Often times people just don’t



Cell Structure College of DuPage Home


Cell Structure College of DuPage Home


A living cell is a complex, multi-functional unit. Even the simplest of cells performs a large array of different tasks and functions. Despite our size prejudice



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