Explanation:
Wind energy, or wind power, is created using a wind turbine, a device that channels the power of the wind to generate electricity. The wind blows the blades of the turbine, which are attached to a rotor. The rotor then spins a generator to create electricity . Wind energy is a renewable energy source that is clean and has very few environmental challenges. Wind power actually starts with the Sun. In order for the wind to blow, the Sun first heats up a section of land along with the air above it. That hot air rises since a given volume of hot air is lighter than the same volume of cold air. Cooler air then rushes in to fill the void left by that hot air and voila: a gust of wind. The Office of Energy Efficiency and Renewable Energy describes a wind turbine as “the opposite of a fan.” Simply stated, the turbine takes the energy in that wind and converts it into electricity. So how does it do that? First, the wind applies pressure on the long slender blades, usually 2 or 3 of them, causing them to spin, much like the wind pushes a sailboat along its path through the water. The spinning blades then cause the rotor, or the conical cap on the turbine, and an internal shaft to spin as well at somewhere around 30 – 60 revolutions per minute. The ultimate goal is to spin an assembly of magnets in a generator which will, well, generate voltage in a coil of wire thanks to electromagnetic induction. Generators require faster revolutions, however, so a gear box typically connects this lower speed shaft to a higher speed shaft by increasing the spin rate to around 1000 to 1800 revolutions per minute. These gear boxes are costly as well as heavy, so engineers are looking to design more “direct-drive” generators that can work at the lower speeds.
Answer:
The answer is A, being shaded out by taller trees.
Explanation:
Low growing shrubs and small trees eventually give way to larger tree species. Notice there is little under story (lower level) because of light restrictions.
<span>In this case, all the scientists and biologists who are studing an oil spill that go on to predict how much damage has been done to both the ecosystem and the organisms living in it can strengthen the predictions by presenting different perspectives and inferences.</span>
The answer is A not D
I took the test and got A as the answer
Answer:
By measuring the height of a tortoise a scientist is gathering QUANTITATIVE DATA.
Explanation:
There are two basic types of data that can be gathered during scientific investigation, these are qualitative data and quantitative data. Qualitative data are those data that are descriptive in nature, this type of data can not be represented with numbers. One good example of qualitative data is the colour of a substance. For instance: A WHITE rat.
Quantitative data on the other hand are those information that can be recorded in number form. For instance, the height of the tortoise in this question can be measured and the value obtained can be recorded in number form.