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Yeah, I had built a few little plywood boats before and we have had a series of dodgy boats as a family. I think the passion to just build things was also a big part of it. What has been the most rewarding part of starting this business? I am able to keep the company running and work on boat designs from anywhere. That's a pretty sweet reward.� Small home built jet boats have exploded in number and it started growing just before we started. I didn�t really do that on purpose but it has definitely worked in our favour. I have also tried to focus on hull design because that seems to be in short supply outside of companies designing their own to sell only as finished boats. Everything else we outsource to specialists. This allows WattsCraft to grow without being limited by physical facilities. Braided Shallows: The Jet Boat launching ramp under the Highway 1 Bridge in the Waimakariri Regional Park, New Zealand - park entrance: 1 Main North Road, Kaiapoi, Christchurch , New Zealand. Opening seasons: J.� Their �Braided Shallows� Tours depart from the Waimakariri Regional Park just 20 minutes north of Christchurch. Enjoy spins and speed in the shallow braided section of this amazing river. Join the Braided Blast and AirBoat here. Share the guides' passion for jet boating and New Zealand rivers. A must do when in Canterbury! Read more. Jet Boating in Christchurch: Check out 7 reviews and photos of Viator's Waimak Gorge Jet Boating Jet Boat Builders Christchurch Dc from Christchurch.� Take a jet-boat ride on the Waimakariri River, locally known as �The Waimak,� with round-trip hotel transport from Christchurch. Select whichever duration best suits your schedule: enjoy a minute braided Blast on the Lower Waimak, a minute Adventure tour through Waimakariri Gorge or a 1-hour Canyon Safari adventure full of thrills and spills � suitable for the whole family. Combine the thrills and excitement of a jet boat ride with the breathtaking scenery of Waimakairir River Gorge on this day trip from Christchurch. Choice of morning or afternoon departure. See the breathtaking views o.

To browse Academia. Skip to main content. Log In Sign Up. Download Free PDF. Ahmet Hakan. Download PDF. A short summary of this paper.

For more than two thousand years, the return of Halley's Comet has been observed and recorded on Earth every 76 years. Its visit, however, was the first time that humans took a close look at its nucleus. One spacecraft went within a few hundred kilometres of the nucleus.

Pioneer Venus Orbiter found that the cloud of gases and dust which make up the tail spread over a region about 20,, km across, 15 times larger than the Sun.

Scientists also discovered that the comet was losing about ten metres of material from its surface every orbit, suggesting a lifetime of about only ] , orbits - in about , years it will disappear. Mark the statements as True T or False F. Halley's Comet was first seen more than years ago. In , two of the spacecraft which observed Halley's Comet were from the Soviet Union.

The sun measures 20,, km across. Halley's Comet has a lifetime of about , years left because it is losing material from its surface every orbit.

How often can Halley's Comet be observed from Earth? What is the tail of Halley's Comet made up of? If this is built, it will be almost twice as tall as the metre Empire State Building in New York. Today, all large cities have tall buildings, either for use as offices or as flats.

These are called high-rise buildings. The tallest of a]i in fact, are not used for offices or for living, but are special structures for radio and television. For instance,Warsaw Radio 10 Mast in Poland, which is metres tall, is the tallest of such structures. The world's tallest office building is the Sears Tower in Chicago.

This has storeys, and reaches a height of metres. Is there any real advantage? The most common reason given is that in many cities there is a lack of space. The island of Manhattan, New York City, is a good example of this. Here, office space Jet Boat Builders Christchurch Usage is very expensive. There is no more land. The same reason is given for high office buildings in Tokyo, London and other large cities of the world. But what about people? Is it really necessary to build high buildings for people to live in? Today, there are many who believe high buildings actually damage 25 people's minds and feelings.

These people believe Jet Boat Builders Christchurch Resources high-rise buildings: -have no advantages, except for their owners and for banks -are not cheap to build -do not help create open space -destroy the landscape 30 -cause crime -are not good for children -are expensive to look after High-rise buildings lower the quality of life.

The following reports show this. Women, because they spend most time at home, suffer most. The report from Denmark. Which of the following is not true?

They are so small that it is impossible to see them even with a high-powered microscope. Everything on Earth is made up of atoms in different 5 chemical combinations. Water, for instance, is a compound of two elements, two atoms of hydrogen and one atom of oxygen. However, some elements, such as gold and diamonds exist uncombined.

Ninety-two elements occur naturally. They range from the lightest, hydrogen, to the heaviest, uranium. Each of the elements has been 10 assigned a number - 1 for hydrogen, 8 for oxygen, 29 for copper, 92 for uranium. They are usually arranged on a chart called the periodic table, which puts elements with the same chemical properties in the same column. Thus, all inert gases, such as helium, appear in one column in the periodic table.

It has enabled us to understand the properties of the elements, the basic building blocks of all matter, so that we know which elements can combine with each other. The science of chemistry is based on our understanding of atoms and their behaviour 20 in interacting with one another.

Another science called nuclear physics came into being to study the structure of the atom itself. As scientists investigated the atom, it became apparent that the atom was not a solid piece of matter, but was made up of even smaller particles. The weight of an electron was very small indeed - approximately one eighteen-hundredth of the weight of a hydrogen atom, the lightest of all the elements. Scientists came to believe that the electrons orbited the nucleus of the atom, in which 30 almost all of the weight of the atom was concentrated.

It is now known that electrons revolve around the nucleus at incredibly fast rates of speed. For many years scientists did many different kinds of experiments and all had the same idea about the structure of atoms. However, when 35 they managed to obtain more evidence, they had to modify the atomic theory.

There was not just one kind of particle in the nucleus of an atom; there were two. One of these has a positive electric charge and is called a proton. The other is neutral, that is, it has no electric charge. For this reason, it was called a neutron. Complete the following sentences. Helium line 13 is a n. Elements line 17 are. An electron line 25 is a n. If something is neutral line 38 , it.

What do. They' line 8 : Elements which 2. The theory about the structure of atoms has changed through years. An electron is heavier than a hydrogen atom.

Electrons turn around the nucleus at a low speed. In what way are gold and diamonds different from other elements? What does nuclear physics study? Complete the following statement. Vibration is movement and sound that comes from objects which vibrate. For example, guitar strings, when touched, vibrate and make a sound; and drum skins, when hit, vibrate and make a sound.

Vibrations are described in terms of amplitude and frequency. In the 5 case of a guitar, the amplitude. If the skin, or the string, vibrates times per second, then we say it has a frequency of Hertz or Hz for short. If it moves faster or slower, then it 10 has a higher or lower frequency.

The human ear cannot detect all sounds. Sounds must have a certain amplitude, and a frequency between 40 Hz and 16, Hz.

Vibrations above or below these will not be detected by the human ear even if they are extremely loud. Many animals have better hearing 15 than us. Dogs, for example, can hear higher frequencies; and bats can hear sounds with incredibly high frequencies - up to 48, Hz.

The vibrating object first causes the molecules in the air around it to vibrate at the same frequency and amplitude. These molecules then cause other molecules to vibrate and so it continues until molecules of 20 air inside our ears vibrate. Finally our eardrums vibrate and cause minute, i. All sounds come from vibrations. But not all sounds are the same. Some are pleasant to hear, such as music.

Others are unpleasant and these we call noise. What's the difference between the two? This is a 25 difficult question to answer. But the sounds of musical instruments, which are usually good to hear, do have a special characteristic: musical instruments, such as the guitar and the drum, vibrate at more than one frequency. Thus, when a guitar string produces the note of A, the vibration of greatest amplitude has a frequency of Hz.

They have less amplitude, and so we do not consciously hear them. But thev add to the sound and form a pattern of frequencies which is pleasant to hear.

Main points:

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