# Science Homework Help

eNotes Homework Help is a way for educators to help students understand their school work. Our experts are here to answer your toughest academic questions! Once it’s posted to our site, your question could help thousands of other students.

• Science
If the experiments that have been carried out can be replicated, it looks like this would be a good alternative, but only for some uses of antibiotics. It doesn't look like this would be a good...

Asked by solvedphyz on via web

• Science
Here are five ways of saving energy while cooking food on a stove: Make sure the container you use is just the right size to accommodate all your food. If you use a container that is larger than...

Asked by sweetdreams365 on via web

• Science
Huntington's disease is a neurodegenerative disorder and its symptoms are adult onset and begin to appear between the mid-thirties to mid-forties. It is an autosomal dominant gene that produces...

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• Science
The resistance of a resistor is given by the formula: Rt = Rref (1 + A*(T - Tref)), where Rref is the resistance at the reference temperature, usually taken as 20 degree Celsius. And A is the...

Asked by bc090400375 on via web

• Science
You must apply Newton's 2nd Law to the book. In the horizontal direction - 90 (cos 30) - Ff = ma 77.9 - mu*Fn = m*a 77.9 - (0.5)*Fn = 20 a You must find Fn from the vertical forces 90 (sin 30) + Fn...

Asked by duafarag on via web

• Science
Engineering comes from putting things togetherand getting a result. technology is engineering that has proven to work again and again.

• Science
I think that the practical aspect is vitally important in CPR Training. It's not akin to watching a food preparation video, where mistakes could be remedied "next time out." Rather, in CPR...

Asked by magnotta on via web

• Science
Learning and passing on one's knowledge of CPR (Cardiopulmonary resuscitation) is extremely important. Being trained is of primary importance. If someone with or near you goes into cardiac arrest...

Asked by magnotta on via web

• Science
Cardiopulmonary Resuscitation (CPR) is a practice used when a person's heart ceases to function properly. This is called "cardiac arrest." It has been a while since my training, and I would not...

Asked by magnotta on via web

• Science
There have been at least five mass extinctions in the history of the Earth. One memorable one was 65 million years ago, when dinosaurs became extinct. Mammals actually co-existed during part of the...

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• Science
Perhaps you hear this more because you are a science teacher. I would imagine that every teacher hears that students hate his or her subject. I know I hear complaints about hating history or...

Asked by trophyhunter1 on via web

• Science
A trench in general results when you dig a hole in the ground which extends for some distance. Imagine you are on top of the grand canyon looking down. What you are seeing is a huge trench that is...

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• Science
A nuclear fission bomb uses two main features: first, that uranium is a radioactive material which spontaneously breaks down into two smaller elements, at the same time releasing a small amount of...

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• Science
The most common way is through the use of inductance which is related to electromagnetism. When you pass a current through a wire a magnetic field is generated at right angles to the flow of...

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• Science
The basis of this effect is kinetic molecular theory - which means that the particles in all matter are always in motion as long as the temperature is above absolute zero. Their rate of motion is...

Asked by ayaanali on via web

• Science
An electric light bulb is not an ideal resistor. This means that as the filament in the light bulb heats up, its resistance changes. When it is cool, the resistance is the lowest. This means...

Asked by bc090401213 on via web

• Science
When two resistors with resistances R1 and R2 are connected in series the net resistance is equal to Rn = R1 + R2. And when the two resistors are connected in parallel the net resistance is given...

Asked by mr-sajid on via web

• Science
ESPs are frequently used to collect submicron particulate that arises from combustion, drying operations, process chemical production, and similar sources. They are also used as polishing devices...

Asked by rahulnemani123 on via web

• Science
I would think that the dietary guidelines for adolescents must include an educational component to it. Adolescents need to understand why they are ingesting what they are taking in their bodies...

Asked by monic2 on via web

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There are many different types of vegetarians and their diet varies based on how far they are willing to go in their abstinence from foods that are now part of regular diets. Some of the several...

Asked by bannana12 on via web

• Science
The most important step to take is to call 911 if you think someone is having a severe allergic reaction. Many people with very serious allergies carry an injection kit with them for such...

Asked by patrysia on via web

• Science
Most of the constant volcanic activity on the earth occurs in places where the various continental plates rub against each other. Some of the most well known are along the pacific rim, often...

Asked by gosiaczek on via web

• Science
I believe that adrenal fatigue is largely a lifestyle issue. It is brought on by stress and, to some extent, by weak overall health. Therefore, the best way to treat it is to combat those...

Asked by joemauv on via web

• Science
As soon as a flower is cut from its stem, it is basically separated from its life support system. Delicate vascular tissue, consisting of xylem tubes which conduct water up and phloem which can...

Asked by malfoyxx321 on via web

• Science
Lettuce leaves need a great deal of moisture in order to grow and thrive. They can grow in sun or partial shade, however, if the climate is hot and dry, make sure to provide adequate water....

Asked by oma16 on via web

• Science
Osmosis is the diffusion of water through a selectively permeable membrane. It is a type of passive transport because no additional energy must be added for this process to occur. If there is a...

Asked by manta-16 on via web

• Science
In semiconductors, current is often visualized by the flow of electrons or positively charged holes from atom to atom in the material. However, only the electrons are actually free to move. The...

Asked by shk0111 on via web

• Science
Because it's healthy for you, that's why (as my mother would say). Broccoli has a lot of Vitamin C and it has a lot of calcium. Both of these are important for you. Broccoli is even said to be...

Asked by doorsreb on via web

• Science
If we can identify the interaction between rumors and b1 integrin, we might be able to find a way inhibit the growth of the tumor, shrink the tumor, or find a way to identify where a tumor might...

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• Science
It is not dangerous to use basil for aromatherapy. In fact, there are many uses of basil in aromatherapy if you believe in that sort of thing. For example, some people believe that basil can...

Asked by mantov on via web

• Science
Are you asking how to do this? A lot of people use a "skin lightener" that works by making your skin stop producing so much melanin. "Excessive" melanin production is one of the causes of dark...

Asked by majaarmour on via web

• Science
Bacteria are microorganisms that many times get a negative reputation, however, most are harmless and some we couldn't live without. There are bacteria that produce vitamins, help with digestion...

Asked by kkelly199 on via web

• Science
There is some research and evidence to support the idea that better more bountiful nutrition in early life does affect fertility factors. A study of two Guatamelan villages found that those...

Asked by matveie on via web

• Science
Does this paper have to claim that the movement of birds causes climate change or is it the other way around? I assume it is climate causing bird movement that you are supposed to write about. If...

Asked by edithmo on via web

• Science
On one level, I think that conservation attempts have to be bolstered by a revisiting or assessing conservation ethics. The practices of why we conserve what we conserve and seeing them in a...

Asked by rahulnemani123 on via web

• Science
Light rays would increase activation energy for chemical reactions to occur in the fruit. Fruit enzymes speed up the decomposition of the fruit itself when it ripens. Ethylene gas which is produced...

Asked by manta-16 on via web

• Science
In classical physics an ideal gas can be theoretically cooled to absolute zero when all particles come to a complete halt. Quantum mechanics and the Heisenberg Uncertainty Principle in particular...

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It appears that being born in winter can lead to an increased incidence of brain tumors in children and to more psychiatric problems for adults. At least some studies have shown a connection...

Asked by mantov on via web

• Science
Perhaps the most important ionic equilibrium is the ratio of hydrogen ions to hydroxide ions in pure water. This can be used to deduce the dissociation constant of water. It is known, from...

Asked by yashaswy on via web

• Science
It is given that the wire is being pulled at the rate of 3 cm/hr. So, we can take the mass of the substance making up the wire and its volume as constant. Due to the pull, the length increases and...

Asked by greg1234 on via web

• Science
The resistance of a wire is given by rho*l/A , where rho is the resistivity, l is the length of the wire and A is the area of cross-section. Now, it is assumed that the three wires are of the same...

Asked by ishro on via web

• Science
Problem A) The net external force will be found by using Newton's 2nd Law. Net force is equal to mass times acceleration. We know the mass is 2.0 kg, the acceleration must be found using...

Asked by duafarag on via web

• Science
Thomson was trying to understand in more detail the structure of the atom. With his cathode ray tube he was able to generate electrical discharges in gas molecules. When he did this a stream of...

Asked by blackeye on via web

• Science
Your reference organic molecule is showing one double bond between the two carbon atoms. Because of this double bond the compound is considered to be unsaturated - meaning it could contain more...

Asked by kanug on via web

• Science
One view point is that "Electrical" relates to the development and delivery of the electrical energy to the various devices that perform specific functions in a given environment. Example: The...

• Science
The solid cube of silver, between the opposite faces of which we have to find the resistance, has a density of 10.5 g/cm^3 and a mass of 90 g. Now density is given by mass/ volume or volume is...

• Science
Gasoline and rocket fuel store energy as chemical energy. The energy is stored in the chemical bonds between the atoms which make the molecules unstable and they always try to react with other...

Asked by hahasmile on via web

• Science
When the sun is used as the frame of reference, the Earth is constantly moving around the Sun. And so is a body that lies on the Earth. Even a body which may appear to be stationary on the Earth is...

Asked by yunjeong on via web

• Science
Any time an individual has a problem they wish to solve, an experiment can be performed in order to test your hypothesis(possible solution) to this problem. This involves the scientific method of...

Asked by steven13 on via web