Science Questions and Answers

Science

I worked in a hospital for many years and seen many patients discharged with PICC (peripherally inserted central catheter) lines. The best thing to do is explain exactly what it is and what it will...

Latest answer posted May 10, 2010, 10:43 am (UTC)

1 educator answer

Science

The area may have gotten its particular mystique simply due to the enormous amounts of marine traffic in and out of the Caribbean for the past several centuries, much of which was related to the...

Latest answer posted January 25, 2012, 3:17 am (UTC)

6 educator answers

Science

I, too, look at the universe as being all encompassing. That said, how the universe came to exist is (and will most likely be) the unanswered question in the end. Depending upon one's ideologies,...

Latest answer posted July 27, 2012, 9:03 pm (UTC)

4 educator answers

Science

The letters "EMF" can stand for a variety of things, I shall address this question from a standpoint of it meaning "electromagnetic field", which is the magnetic field created by passing an...

Latest answer posted July 3, 2012, 3:02 pm (UTC)

1 educator answer

Science

Hello! The formula seems correct. It can be obtained from the following facts: `E_n = (n^2 h^2)/(8mL^2)` and `lambda = (hc)/(E_2-E_1),` where `n` is the state number (changes from `2` to `1` in...

Latest answer posted July 16, 2016, 8:26 am (UTC)

1 educator answer

Science

The elephant shrew is a mammal that is native to central Africa. It is not really a shrew but was given that name because it seemed to early scientists to look and move like a shrew. The elephant...

Latest answer posted December 4, 2010, 1:26 am (UTC)

1 educator answer

Science

STP means the standard temperature and pressure conditions. In chemistry standard temperature is 273.15 Kelvin and standard pressure is 1 atm. In ideal gas law it is considered that at STP the...

Latest answer posted July 31, 2012, 1:51 am (UTC)

1 educator answer

Science

Evolution is change over time. This can refer to the organisms as well as the non-living environment. An ecosystem includes all the organisms and their interaction with the non-living environment....

Latest answer posted November 20, 2010, 9:53 pm (UTC)

1 educator answer

Science

Hello! The mass conservation law will help us in this problem. Denote `rho_1` the known density of 95% sulfuric acid, `rho_2` the known density of 40% sulfuric acid (the given numbers are in...

Latest answer posted October 26, 2016, 5:46 am (UTC)

1 educator answer

Science

The pKa and pKb values are measurements of the strengths of acids and bases respectively. The smaller the pKa value, the stronger the acid. Likewise, the smaller the pKb, the stronger the base. The...

Latest answer posted February 15, 2016, 1:04 pm (UTC)

1 educator answer

Science

The weight of the block = 45 N = Normal force on the block When we try to move the block, static friction will oppose the motion. The motion will not take place until the force applied is...

Latest answer posted November 23, 2015, 5:32 pm (UTC)

1 educator answer

Science

In gymnosperms, or cone-bearing plants, including Gingko, evergreens like pine trees and cycads, the sporophyte is the dominant generation. These plants can produce separate male and female cones...

Latest answer posted January 11, 2011, 12:58 am (UTC)

1 educator answer

Science

This question is a direct demonstration of measuring by displacement. When you place the ball in the water, it displaces some of the water, pushing it out of the way. We see this as the water level...

Latest answer posted January 4, 2012, 4:28 am (UTC)

1 educator answer

Science

Cognition (lat. “to know”) is the term for the mental process, roughly akin to “thinking”. The human thought process has many components, some of which are as follows: Attention = alertness and...

Latest answer posted October 5, 2011, 3:40 am (UTC)

1 educator answer

Science

Malocclusion of teeth has many other names including crowded teeth, misaligned teeth, underbite, and overbite. It simply means that the teeth are not aligned properly. Malocclusion is often...

Latest answer posted June 3, 2010, 5:09 am (UTC)

2 educator answers

Science

I am listing an excellent site that you may use for your research paper on lions. It is the website for the African Wildlife Foundation and contains extensive information regarding the lion. It...

Latest answer posted June 7, 2010, 12:55 pm (UTC)

1 educator answer

Science

This is principally a conservation of energy problem. In this case gravitational potential energy is being converted to kinetic energy. Then 46% of the kinetic energy is being converted to...

Latest answer posted January 23, 2012, 8:16 am (UTC)

1 educator answer

Science

Relative humidity is a measure of ratio of actual density of the vapour over its saturation density at any given temperature. The amount of water vapour in the air is dependent of the temperature...

Latest answer posted July 31, 2013, 1:48 pm (UTC)

1 educator answer

Science

No, not every sample of seawater will have the same proportion of salt to water. This has to do with many factors. Seawater along the coast has a lower salinity than in the middle of the ocean....

Latest answer posted July 21, 2016, 3:15 am (UTC)

1 educator answer

Science

The Intergovernmental Panel on Climate Change, an international collaboration of scientists, puts together a report roughly every seven years to outline our current state of knowledge surrounding...

Latest answer posted May 29, 2016, 1:21 am (UTC)

3 educator answers

Science

People get side effects from medicine because the medicines are not part of their natural bodily processes. Side effects are problems that occur when the use of medicine goes beyond the desired...

Latest answer posted July 21, 2010, 7:19 am (UTC)

1 educator answer

Science

As with anything medical related, it's always best to consult your doctor if you have any questions about whether or not you may have Appendicitis. Appendicitis is tricky to diagnose because...

Latest answer posted December 16, 2009, 10:54 pm (UTC)

1 educator answer

Science

Static electricity is all about electrical potential energy stored in objects. My approach here will be classical, and include Coulomb forces. A more modern approach would use Quantum Mechanics.To...

Latest answer posted March 12, 2016, 2:05 pm (UTC)

1 educator answer

Science

The echinus sea urchins are very interesting. They are quite pretty, but also come in a variety of different colors and types. Some are not little, really. They can be as much as 15 centimeters...

Latest answer posted March 1, 2012, 3:28 pm (UTC)

2 educator answers

Science

It is true that our Sun is ultimately going to become a red giant and expand into a much larger size and engulf most of the planets of solar system. When that happens, the life on Earth will cease...

Latest answer posted January 6, 2016, 3:59 am (UTC)

1 educator answer

Science

People have been using stones and crystals for thousands of years. I think there might be a sort of placebo effect here. For it to work, you have to beleive it will work. If you don't believe it...

Latest answer posted February 27, 2012, 3:05 am (UTC)

2 educator answers

Science

I think that chances are we will end up living in a dome. Although I would like to think that we will find a way to cut down on pollution, chances are we never will. We will need a way to keep...

Latest answer posted February 21, 2012, 3:29 am (UTC)

1 educator answer

Science

There are a few reasons why we can't see green stars: stars are not naturally green the atmosphere acts to 'redden' stars human vision doesn't normally see color at night Stars have a natural...

Latest answer posted October 28, 2015, 6:39 am (UTC)

1 educator answer

Science

The force of gravity. as explained by Sir Isaac Newtons universal law of gravitation, is a result of the the mass of the Earth exerting an attraction on the mass of other objects. So one of the...

Latest answer posted June 26, 2012, 2:23 pm (UTC)

1 educator answer

Science

At the tip of a stem, one can find a bud which is an undeveloped shoot. It gives rise to a shoot, or flowers. It can remain dormant until favorable conditions occur and then it will grow. A bud is...

Latest answer posted August 5, 2012, 3:34 pm (UTC)

1 educator answer

Science

Virulence is a term that refers to a microorganism's or virus's ability to make an organism, such as a human, less fit. There are several factors that will influence virulence: 1. Adhesion- the...

Latest answer posted December 30, 2011, 3:53 am (UTC)

1 educator answer

Science

DNA or deoxyribonucleic acid is an essential constituent of all living organisms and contains the genetic information necessary for the propagation of life. Every cell contains DNA molecules. In...

Latest answer posted February 12, 2016, 5:17 pm (UTC)

1 educator answer

Science

In order to find the volume of the wooden block, Dash and Bob would use the formula: Length x Width x Height = Volume of a Rectangular Prism (in cubic units) 3.10 cm x 0.50 cm x 2.0 cm = 3.1 cubic...

Latest answer posted September 1, 2015, 11:43 pm (UTC)

1 educator answer

Science

We know that fruits contain seeds. In a plant, the seed is a small embryonic plant enclosed in a seed coat, and containing a food storage for the nutrients of the embryonic plant (which we can...

Latest answer posted June 18, 2013, 11:43 am (UTC)

1 educator answer

Science

Charles Darwin had an excellent background for a scientist, and particularly for a zoologist. He came from a distinguished family of scientists and physicians. His grandfather was Erasmus Darwin,...

Latest answer posted June 13, 2020, 7:34 pm (UTC)

1 educator answer

Science

A Levee is an embankment built along the sides of rivers, streams and the sea as vertical or sloping walls. They are usually made of mud and prevent flooding by stopping the water from flowing into...

Latest answer posted April 11, 2011, 3:20 am (UTC)

1 educator answer

Science

DNA, a nucleic acid contains the genetic code, located within the nucleus. It has the instructions to manufacture proteins outside the nucleus at the ribosomes. Another nucleic acid, called RNA is...

Latest answer posted March 10, 2012, 1:17 am (UTC)

1 educator answer

Science

What is the dipropopyl ester of a phosphoric acid? For this problem, it is best to just dissect it into its component parts. One needs to know what the chemical structure is for phosphoric acid,...

Latest answer posted November 20, 2015, 8:18 pm (UTC)

1 educator answer

Science

Our body requires water for a number of processes and this demand is satisfied by drinking more and more water, as per the needs of our body. However, not all the consumed water is used and part of...

Latest answer posted March 16, 2016, 5:11 pm (UTC)

1 educator answer

Science

g-forces refer to when our body experiences a gravitational force either greater or less than normal. Normal acceleration of gravity on earth is 9.8 m/s/s. Greater g-forces are experienced for...

Latest answer posted May 18, 2011, 6:29 am (UTC)

1 educator answer

Science

It might be wise here to give an overview of the internal combustion engine and the basics of how it works. The heart of a gasoline engine is the fuel cylinder. The cylinder is a metal cylinder...

Latest answer posted September 27, 2013, 12:43 am (UTC)

1 educator answer

Science

I don't know how good an idea it was to return the lobster to the sea. After all, the lobster has been living comfortably as a pet for a long time. Chances are it would have been better off still...

Latest answer posted March 1, 2012, 3:25 pm (UTC)

4 educator answers

Science

I don't know what's going on in your life to be able to relate it to your life, but I know some things about the general teenage life. How about: Atoms, the cool kids! (because everyone wants to...

Latest answer posted February 28, 2012, 2:10 pm (UTC)

3 educator answers

Science

Deoxyribonucleic acid, or DNA, has been around since the dawn of time. However, it's makeup was not uncovered until 1869, when the Swiss physician Friedrich Miescher found a tiny substance in the...

Latest answer posted June 22, 2011, 1:38 am (UTC)

1 educator answer

Science

It really depends on what is happening at home. A child could be kept at home in a rich environment, surrounded by loved ones, and learn just as much or more than if that child went to preschool....

Latest answer posted February 28, 2012, 12:16 pm (UTC)

7 educator answers

Science

The coordinate `R_(cm)` of the center of mass of a system composed by n particles is defined as a vector by the relation: `M*R_(cm) = sum_(i=1)^n (m_i*r_i)` where `M` is the total mass of the...

Latest answer posted October 27, 2013, 6:16 pm (UTC)

1 educator answer

Science

The cell membrane separates the inner parts of a cell from its surroundings. It is selectively permeable meaning that certain substances pass in or out and others do not. This is due to size of the...

Latest answer posted April 21, 2012, 11:30 am (UTC)

1 educator answer

Science

This would depend upon the nature of the failure of the two systems. The CV system would be monitored through normal criteria, starting with pulse, blood pressure, oxygen saturation. Then heart...

Latest answer posted June 2, 2009, 4:16 am (UTC)

1 educator answer

Science

To find the anti derivative of y=e^x/(5+e^x) we use substitution. Let y = 5 + e^x dy = e^x * dx Int[ e^x/(5+e^x) dx] => Int [(1/y) dy] => ln |y| + C substitute y = 5 + e^x => ln |5 + e^x|...

Latest answer posted April 8, 2011, 3:02 pm (UTC)

1 educator answer

Science

The skin is a fairly difficult barrier for viruses and bacteria to cross, and is our first line of defense. Tears not only lubricate the eye, but help it to continually flush out debris. The nose...

Latest answer posted February 15, 2010, 10:00 am (UTC)

1 educator answer

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