Drag is a common force in the universe, and occurs in everyday life especially in water. Mr. Redman states that,” forward is a propelling force; drag is a force that hinders that motion” or is the force acting in opposition to the motion of an object. Parachutes are a great example of this force; when air is trapped in the nylon of a parachute, it creates drag slowing the velocity of the parachutist. Water drag is acted upon swimmers at all times. Hydrodynamics show that materials of the swimmers closely affect drag. Swimmers wear sleek swim caps, shave their body, and wear tightly fitted swimsuits all to reduce friction. Skill level and technique of a swimmer also affect drag resistance. “Water is 800 times denser than air, drag forces …show more content…
Trucks experience air resistance due to their big and boxy frame. Air constantly pushes against the shipping containers. Engineers have found a way to combat such a force by adding large hoods or visors, in which the cab and trailer are connected. The back of the truck is built in a streamlined fashion, like a plane, to completely extinguish swirling air (Parola, 2000). Another example of drag is frictional forces. Trains, for example, use wheels to move along tracks. These wheels encounter friction when stopping. Metal on metal gains immense friction and may become hot. This drag is common among cars and other ground transportation. Engineers have looked to the future to solve this drag. MAGLEV trains are levitating trains that use magnets for propulsion. This way friction drag is eliminated, yet air resistance is still a factor. To cut down on air resistance, MAGLEV trains incorporate aerodynamic principles such as a slim line body to cut through air, that way the force of air is evenly distributed around the body. Drag also occurs in water called, fluid friction or fluid resistance. Boats, ships, subs, whales, dolphin, and swimmers all go through fluid rest incense. Much like air resistance, fluid pushes against the direction in a object is moving. And again much like air resistance, a streamlined body will reduce this drag. Submarines were once built like boats only they were underwater. Until 1953 when the us army proposed a
Climate change is arguably the greatest threat to humanity and the worst of it’s effects are fast approaching. It is the basis of a myriad of problems, one of which is water scarcity. As the world population grows and the climate warms, demand for fresh water has surged-- with water scarcity affecting more than 40 percent of the global population (United Nations, 2010). Conversely, the world’s fresh water supplies are dropping. Water is indispensable to biotic existence. While it aided in humankind's creation, it can also aid in its downfall. Bearing these elements in mind, one can consider the implications of this water crisis: What are the threats to its quality? Who will it affect? Is water a right or a commodity? What are the social, economic, and political variables and how do they connect? And ultimately, how can we fix this? Throughout my research I seek the answers to these critical questions.
Abstract: During this lab, the pH of water in soil from a man made garden, a deciduous forest, and a river bank were tested after leaving it in containers for one, two, and three hours, coming out to a total of three trials with three different soils all together. After testing the pH of the water when being added to the soil for the desired amount of time and comparing it to the original water with no soil added, is then when each pH difference was observed and recorded in a a notebook, while pictures were taken of the experiment being conducted.
Water is probably the most important resource we as people have. Humans can survive without food for several weeks, but without water we would die in less than a week. On a slightly less dramatic note, millions of liters of water are needed every day worldwide for washing, irrigating crops, and cooling industrial processes, not to mention leisure industries such as swimming pools and water-sports centers. Despite our dependence on water, we use it as a dumping ground for all sorts of waste, and do very little to protect the water supplies we have.
uish whether a black person or a white person were talking is the way that they talked. The difference in dialogues is because during this time, white people recieved a better education than black people, and as a result of that, their articulation is better. It is also interesting the way he wrote his conversations with his students. He talked to them as if they were his friends and teased them just to get a reaction out of them. He also talked to them and treated them as equals, not as African American subordinates. The description of Conroys conversations is also written really well. It is easy to envision what is happening because of how descriptive it is and that makes it much easier to read. Conroy did a good job writing this book as
Over the recent years, freshwaters have decreased dramatically due to water pollution. Therefore, 3% of water is freshwater and 97% is saltwater. As the result of this water pollution can have a meaningful consequence not only to animals and humans but as well as to plants. In addition, it causes an eruption of a current plant growth by harming the earth’s aquatic environment by altering the plant’s surrounding pH level. Acid rain is formed because of the atmospheric sulfur dioxide and nitrogen dioxide which is produced by human-made sources. In fact, with most of the environment freshwater from lakes and rivers, one of the most common aquatic plants are American waterweed the elodea plant. The behavioral function of this plant is to float
Water is a basic necessity in our daily lives. Over 50% of our bodies are made up of water, so in order to be a healthy human being we should be consuming about 2 liters of water a day. This is easy to do for some people, especially those who live in more developed countries such as the United States of America. This can’t be said for developing countries, such as Algeria. Considering that the Sahara Desert covers most of Algeria, it is one of the countries that are water-scarce. The water sector in Algeria is very unreliable particularly due to its geography and climate change. These impacts are causing problems for future water resources. Water resources are one of Algeria’s most current issues and dealing with the decrease in renewable water resources. This is problematic because the declining water resources means Algerians lack access to safe, clean drinking water, which can lead to diseases if people are consuming contaminated water. Also with limited/declining water resources there are issues with hunger and sanitation. There isn’t enough water for agriculture and the production of crops. It’s important to address the issue of water scarcity and implement solutions that will better the supply of water.
Water pollution has been a huge impact on the planet we live on, Earth. The progression of what it used to be today is honestly tough to even think about. Imagining a world without water pollution is almost impossible to think of at this point. It is truly something that can’t be fixed because it is occurring every day and continues to get worse and worse. Really the only thing we can do as humans is to try to do it less.
Have you ever wondered if our drinking water is actually safe to drink? The topic of safe drinking water according to my research isn’t a topic that it’s given that much attention even though there have been events and statistics that have impacted our drinking water. There have been important events such as the chemical spill in Charleston, West Virginia and the ash sludge in Kingston Tennessee in 2008, these kind of events even though they have happen a few years ago still have an impact on our drinking water today. Lauren Russell is an important person because she stated that climate change is another factor that can affect our drinking water because it can impact the quality of the water since climate change is a main world problem it affects everyone 's drinking water. Another big factor of drinking water is what kind of chemicals are in our water that makes it safe for us to drink? I feel like people and I should be informed of the risks that human and natural disasters can do to our sites that we get our drinking water from. And we should also be inform if the chemicals that they put in our drinking water are one hundred percent safe. The reason why I chose this topic is because water is a necessity for every human so if we all get informed about this topic we can enforce better laws that can ensure us the best water quality for us to drink.
John Thorson stated “Water links us to our neighbors in a way more profound and complex than any other.” Water has been every civilizations main source of energy for years. People have always been relying on its wonderful supplying, whether it 's plants getting nourished or towns obtaining their drinking supply, it 's very important and without it humanity would suffer. Water has connected people since the beginning of time and it will continue to until the end of time.
Pollution can become a serious situation when the lives of humans and wildlife are threatened, therefore, it is researchers and scientists jobs to keep pollution controlled at the least through water regulations. There have been many stories of water pollution within the last decade pertaining to the discovery of dangerous metals. For example. The Flint Michigan water crisis in 2016 was due a water supply change that ended up containing lead and causing extreme illness to the population and a decrease as well according to researcher Victoria Morckel.1 Even researchers of the American Public Health Association discussed copper contamination in the water as well.2 Consequently, testing the water supply of the many different cities and
Water affects Health, Development, Economy, Agriculture, Education, Employment and so much more. The affects of water scarcity is on every human and following are a few facts;
Water is possibly among the most integral resources in the world. Water is one of the main resource for human development, it is even one of the major resources for agriculture, transportation and industrialisation. According to USGC (2015) about 70 percent of the earth is covered with water and from that only 2.5% is fresh water.Though water is an integral part of human life many people do not have access to it. The water (2015) claims that 663 million people or about 1 in 10 people in the world do not have access to fresh water. Industrialisation has aggravated water pollution and that has decreased the amount of freshwater available, one such example of a polluted fresh water river is the Chao Phraya River in Thailand (Greenpeace,2015). As freshwater bodies are becoming more scarce and expensive, fresh water should be provided in the most feasible way possible. This report will illustrate Desalination and Cloud seeding as the two techniques for providing fresh water in the arid regions of the world. Firstly, this report will look at the present situation of arid regions. Next, this report will examine the requirements needed for the techniques such as monetary and environmental requirements. Finally, comparisons would be made between the options and recommendations would be given.
Water pollution, a serious incident that is happening currently, is damaging the environment. There are multiple cases if water pollution. "It usually occurs anywhere around the world in lakes, rivers, oceans, and ponds." (Amieddoleh). Just a few include the Colorado River, the New Zealand River, and the many American beaches. "The main places water pollution occurs is in coastal regions and down river from a major city" ("Water"). Water pollution is almost always occurring. Altogether there are many water pollution incidents, it is interesting to learn about the cases and find a possible way to resolve the environmental problem.
The commodification of water throughout history has had substantial impacts the way we live our lives and the health of our nation. Initially effluents from towns, various types of mills, and tanneries were channeled to the nearest waterway to be carried downstream and away from the pollution source. This theory of "dilution is the solution to pollution" worked for a little while but as population grew and the demand for freshwater for humans consumption increased as well Americans learn quickly that this theory was incorrect.
70 % of our Earth surface is covered by water and almost 60% of the human body contain water for nutrient transportation. The unique characteristic of water is water molecule is the only substance in this Earth that exist in all three physical states of matter which are solid, liquid and gas. All human beings need water to survive. The national development over the years cause the rate of water pollution increased. According to Gebre & Rooijen (2009) water pollution can be considered as a sign that derives from economic growth and is a common phenomenon in urbanized cities in developing countries. In general, there are three main issues that related to water pollution which are the causes, effects and the way to decrease this problem.