Internal validity

The steam engine was invented in by Thomas Savery in 1698 and by Thomas Newcomen in 1705. These engines used the energy from burning coal to drive water pumps that were used to drain the water from mines that would fill up with water. These steam engines would later be modified by a man with the name of James Watt. Watt was working in a factory that was used to produce instruments when a model of a steam engine was placed on his desk for repair. Upon investigation Watt discovered how truly…

Physics is everywhere. Especially in NASCAR which stands for National Association for Stock Car Auto Racing is a racing sport which the racing cars have motion. “NASCAR is motorsport's preeminent stock-car racing organization. The three largest racing-series sanctioned by this company are the Sprint Cup Series, the Xfinity Series, and the Camping World Truck Series.”(Mukul Bhatia.What is NASCAR?.www.quora.com.) On the rough racetrack nascar cars are made to be driven in extreme conditions. In…

Renewable energy vs Fossil fuels The earth has been around for a copious amount of years. Everyday people affect the earth in both a positive and negative way. The most common way of producing energy is by the use fossil fuels. The use of fossil fuels can have a major impact on the earth’s environment. For instance, oil spills, global warming, etc. While some difference between fossil fuels and renewable energy are evident, the similarities are sometimes overlooked. Many of the devices people…

There are many car seats that people use in the world today because of the benefits they enjoy from them especially the toddler car seats as they help to provide safety and comfort for the children as much as possible. The car seat is usually fixed to a vehicle and then children are placed in the rightly place in the seat. For the people that have been looking for a reliable car seat for their children, the Britax Marathon 70 Convertible Car Seat will be the best one for them. Children will…

A snow blower is really useful and we all should have one, in case we live in an area were the snow is a problem. In case you don't have a snow blower and you are thinking to buy one, but you don't know what to choose, here are some pros and cons of different types of snow blowers. Single stage electric snow blower In case you have a small driveway, then this type of snow blower is perfect for you. Because it's electric, it doesn't need fuel and also it doesn't require any engine maintenance…

the Chinese in the eleventh century. Rocket propulsion was at first utilized as a part of an unobtrusive route for firecrackers; however, it progressively advanced to move imposing weaponry; and there the innovation slowed down for sometime. As the internal combustion engine continued to develop, aerospace engineers started to understand that the piston engine was self-constraining as far as the maximum performance was concerned, which could be accomplished; the point of confinement was…

Deciding to expand your fleet, upgrade your current rig, or going solo as an Owner/Operator is a big step, one that could cost you a ton of money. At Coopersburg & Liberty Kenworth, they have a huge selection of the T680 Kenworth at low prices, so you can get the truck you want at a price you can afford. The T680 Kenworth's PACCAR MX-13 Engine Billed as Kenworth's most aerodynamic truck, the T680 Kenworth takes fuel economy to new levels. Under the hood is the PACCAR MX-13 engine, a 12.9 Liter…

Do you think Americans should find a new way for transportation or use what we use today known as cars? We should think of new ways for transportation because our cars that we use today are not good because of the cost of them, what they do for the environment, and American’s exercise. The costs of cars are very expensive, and the cost of owning a car is already on average $8,876 per year. You also would have to pay for gas and if you travel, go to work, or just to go shopping its gas that…

Almost every wide eyed child wishes they were older to enjoy the imagined thrill of driving a car or even having candy for dinner. However, reality strikes hard when on the cusp of adulthood. The very first glimpses of maturity are revealed during the last years of high school and finally present themselves with a coming of age item a car. To parents a car comes as a precursor to watching their little ones leaving the nest. My experiences with my first car gave me personal insight on the…

I’ve chosen solar powered cars as my topic of choice, my knowledge is limited on the subject. Solar powered cars don’t use fossil fuels, so they don’t cause pollution making them environmentally friendly, which is ideal. They get their energy from the sun, through solar panels that store energy in batteries, or battery packs. The process that this happens in, is conversion of energy through photovoltaic cells. These cells are what makeup a solar panel, made up of semiconductors usually silicon.…