A whole structure like a tree or an aeroplane may appear to be very complicated. But complicated structure are made up from smaller parts which are usually much more simple. In fact, most structures can be made from just five important and very simple shapes. These are sheets, cylinders, cubes, spheres and cones.
The contens are: perpetual motion; forces in action; rubbing and rolling; a machine for war; slopes and wedges; twisting and turning; moving in circles; cogs and wheels; on two wheels; pullinng and lifting; feeding machines with energy; getting up steam; machines to make machines; electric motors; a macine that files; reaching the fire; pumping petrol; piston power; ........
There are more than 5.000 million people living on our planet Earth. The Earth provides us with air to breathe, food to eat and water to drink. It gives us the materials to build homes and shelter, as well as for clothes, and it provides us with many other things that we need or enjoy. Every single one of us depends on the Earth for life.
This book explain about anything in plant. About roots, stems, leaves: about plants need: pollination: shoots and roots, grasslands all over the world, plants in dry places: floating in the sea: in woods and forest: in the rain forest,.......
This book talk about the solar system, light telescopes, rockets, orbits, space shuttle, satellite servants, communications and tracking, training the astronauts, going to the moon, space probes, voyage of discovery.
Buku ini menjelaskan tentang berbagai macam hal mengenai sains yang ada di sekitar kita seperti : Hewan, Sel sel yang dapat dilihat oleh microscope Serta organ organ yang ada dalam hewan .
Computers are especially useful for storing a lot of information. They can keep words, pictures and sounds in their memory, and give you the information you need within seconds.rnEven the most advanced computers are often easy to use. They communicate with you by flashing messages or pictures onto a screen, ar sometimes they talk to you. You can play games with them, too.rnThis book explain abo…
Contained in this book are a great variety of cities from throughoit the world which have been the sites of the great twists and turns of civilization. There are the great political capitals like London and Moscow, and the cities like Venice and New York that defined the world of commerce in their heyday. There are the cities like Athens and Florence, in which intelektual revolutions took place…
The natural world is a wonderful place, filled with amazing features and spectacular sights. The majesty of znow-capped mountains and vast canyons is contrasted with the terror of violent volcanos and the mystery of subtemannean caves and chambers.rnThis book sis a celebration of the wonder of our natural world, as seen from the vantage points of the most spectacular, the most remarkable and th…