Science Questions and Answers

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)

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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)

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Science

Petechia on the lungs are more consistent with suffocation, particularly when petechia are also present on the mouth or pharyngeal tissues; finding these would tend to indicate the possibility of...

Latest answer posted July 15, 2011, 11:33 pm (UTC)

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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)

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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)

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Science

Wi-fi is a type of electromagnetic signal that is used in telecommunications to transmit data. The phrase has become very common and is often used interchangeably with the concept of access to the...

Latest answer posted August 1, 2016, 6:43 pm (UTC)

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Science

There are many more ways than you might think to become an astronaut. You don't necessarily have to study aeronautical engineering because there are many different types of jobs on a space mission....

Latest answer posted February 20, 2010, 12:55 am (UTC)

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Science

The "Go Green" movement is the latest movement to encourage less waste, more recycling, and less harmful impact on the environment. The pros of this movement should be obvious; anything that will...

Latest answer posted May 8, 2012, 1:25 am (UTC)

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Science

In a transformer if voltage and number of turns in primary are Vp and Np respectively and voltage and number of turns in secondary are Vs and Ns respectively, Vs/Vp = Ns/Np Therefore voltage coming...

Latest answer posted May 16, 2012, 6:23 am (UTC)

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Science

Louis Pasteur performed the first scientific pasteurization in the mid 1800s. The key idea behind pasteurization is the reduction, but not necessarily the complete elimination, of bacteria in food...

Latest answer posted August 23, 2011, 4:23 am (UTC)

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Science

Living things require energy which enters ecosystems as light and exits for the most part as heat. A food chain or web is a diagram that shows feeding relationships among members of a community. In...

Latest answer posted January 27, 2016, 2:14 am (UTC)

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Science

Bacteria have many beneficial uses. Bacteria are used in yogurts and supplements. It can also be used in environmental cleanup, such as in the recent oil spill. Bacterial photosynthesis was used...

Latest answer posted October 11, 2011, 2:52 pm (UTC)

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Science

Hello! Yes, this probability is an integral from `12 - 0.2 = 11.8 nm` to 1`2 + 0.2 = 12.2 nm.` There are two problems: what is the function to integrate and what is the value of the integral. It is...

Latest answer posted July 16, 2016, 7:31 am (UTC)

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Science

I imagine that your own text or the movie you watched (or whatever your source of information is) tells you the answer you are supposed to come up with. I hope that the study that I have linked to...

Latest answer posted December 4, 2010, 1:15 am (UTC)

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Science

The duality of electrons and light, i.e. existence both as particles and waves, is a breakthrough Physics achievement through which we can explain practical observations. de Broglie suggested that...

Latest answer posted June 2, 2015, 10:19 am (UTC)

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Science

A disease causes malfunction of body systems and has specific signs and symptoms. Diseases may be caused by external causes in the case of infectious diseases or can be caused by internal...

Latest answer posted November 17, 2010, 7:25 am (UTC)

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Science

An orchestral performance is ful of physics concepts. The design of the hall deals with acoustics - how waves interact with different surfaces and how to make sure that there are no dead spots in...

Latest answer posted November 19, 2010, 7:20 am (UTC)

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Science

You mentioned that this question is in regards to intravenous medications. Can I assume that you are talking about the dsg. that is on top of a IV site? If this is the case and you need to change...

Latest answer posted May 25, 2010, 6:39 pm (UTC)

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Science

Well, in reality any idea that is not supported by evidence is merely that: An idea or hypothesis. A theory however dissociates itself from a hypothesis in that there is evidence available to...

Latest answer posted November 24, 2010, 3:43 am (UTC)

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Science

Mechanical weathering is the process by which larger rocks are broken into smaller pieces of rock via mechanical forces. These mechanical forces may include temperature fluctuations, ice wedging,...

Latest answer posted November 12, 2015, 7:09 pm (UTC)

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Science

The distance traveled by the ball is given as 139 m and the average speed of the ball (through the air) is 13 m/s. Speed is defined as the ratio of distance traveled to time taken. In other words,...

Latest answer posted February 5, 2016, 4:01 am (UTC)

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Science

The properties of substances involved in lava lamps are density, polarity, and energy transfer. Lava lamps work on the premise of convection cells. As the materials are heated from a source at the...

Latest answer posted September 13, 2012, 10:12 am (UTC)

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Science

Enterococci (the plural form of the word) are part of the intestinal area of people. According to scientist there are over 17 species in humans and E. faecalis & E. faecium are the most common....

Latest answer posted October 29, 2011, 7:11 am (UTC)

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Science

The exact composition of comets varies considerably, but the great majority of them come from the farthest reaches of the solar system and are basically just gigantic dirty snowballs, meaning that...

Latest answer posted July 23, 2016, 9:20 pm (UTC)

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Science

Suppose the treadmill starts from 0 velocity. Using `v = u+at` `t = 60*4.2 = 252 seconds` `v = 0+0.0044*252 = 1.1088m/s` So the velocity is 1.1088m/s

Latest answer posted October 11, 2012, 1:04 am (UTC)

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Science

Friction is a force that opposes motion and yet it's necessary for some types of motion. When you walk, your foot pushes back on the floor and the floor pushes your foot forward. Friction is the...

Latest answer posted December 6, 2015, 5:59 am (UTC)

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Science

Let us say when boy catch the bus the bus has run xm from its initial position. So at that time boy runs (48+x)m. Let us say the time taken to catch the bus is t. For bus `S = ut+1/2xxaxxt^2` `x =...

Latest answer posted June 6, 2013, 10:50 am (UTC)

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Science

One can think of global ocean conveyor belt as the movement of warm surface water towards the poles and the movement of colder water (near the ocean floor) towards the equator. This constant motion...

Latest answer posted February 27, 2016, 2:23 pm (UTC)

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Science

Two types of stroke(CVA) cerebrovascular accident exist, the first type is a hemorrhagic stroke. This is when a blood vessel in the brain ruptures and blood is leaked into the cerebral tissue. The...

Latest answer posted June 10, 2010, 2:09 am (UTC)

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Science

You can't get rid of pores, but then, you wouldn't want to. Pores perform highly necessary functions for the body, and are essential for the health of the skin. To name but two, they allow oils to...

Latest answer posted November 12, 2008, 9:18 am (UTC)

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Science

I believe the question is in regards to making a difference in the amount of time it takes to heat the water? Simply put, the answer would be a "yes". The amount of time it takes to heat a...

Latest answer posted September 20, 2015, 5:00 pm (UTC)

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Science

Pancreatic juice is an alkaline secretion of the pancreas, a large gland which sits somewhat behind the stomach from where it empties its secretions into the upper part of the intestine called the...

Latest answer posted May 27, 2016, 1:36 pm (UTC)

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Science

Before we can use the integrated rate law we must first find the rate constant for the reaction. We can use the half life equation for a second order reaction: t = 1/(k[A']) where t is the half...

Latest answer posted December 7, 2012, 1:38 am (UTC)

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Science

Think of the registry in your computer as compartments in a mail room. The postmaster sorts the mail and puts each item of mail in a particular spot everytime. Then, the recipient of the mail in...

Latest answer posted November 18, 2009, 12:34 pm (UTC)

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Science

The electron transport chain is a way building energy for plants and producing energy for animals. It involves similar processes in both plant and animal cells, each using the other's waste...

Latest answer posted February 10, 2012, 2:59 am (UTC)

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Science

The solubility of a salt at a particular temperature can vary with different pH. If the salt contains a specie which has a conjugate weak acid or base, or can react with additional `H^(+)` or...

Latest answer posted January 22, 2013, 10:47 am (UTC)

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Science

Essentially, these are opposite processes. In photosynthesis, a plant uses its chlorophyll, a green pigment found in its chloroplasts to capture the sun's energy. It then uses this energy for the...

Latest answer posted February 21, 2012, 5:58 am (UTC)

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Science

When a baby is born, it actually has several soft spots all over the head - most are small enough though that they are virtually undetectable. "The" soft spot, the largest one right on top of the...

Latest answer posted July 27, 2010, 4:34 am (UTC)

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Science

Scientists have always studied trees to learn about the changes in geography, but nowadays they are looking at the rings in the tree to determine something else. They are examining the width of the...

Latest answer posted December 9, 2009, 5:11 pm (UTC)

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Science

It is not true that African American women are seldom affected by osteoporosis. Is it the misconception that they are at a lesser risk that causes under diagnosis and treatment for the black...

Latest answer posted August 8, 2010, 8:52 am (UTC)

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Science

When a person has meningitis, it means that the fluid surrounding the spinal cord and brain have become infected by bacteria. In addition, it also causes blood infections. It is a very serious...

Latest answer posted August 16, 2010, 12:19 am (UTC)

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Science

In mitotic division, the chromosome material in the nucleus is replicated. That is because the DNA which makes up the chromosomes can serve as a template to make more DNA. By making a second set of...

Latest answer posted August 28, 2010, 11:01 pm (UTC)

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Science

Implications or applications of Piaget's theory with respect to the intellectual development of children are 1. Learning through discovery and recognizing the child's role in discovery knowledge,...

Latest answer posted October 15, 2013, 3:47 pm (UTC)

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Science

The presence of a control group is necessary when conducting a controlled experiment because it is the setup that doesn't contain the variable being tested. The control setup gives the experimenter...

Latest answer posted September 28, 2019, 9:29 pm (UTC)

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Science

It has been said that air condioning is the main reason some parts of the world, and parts of countries, were developed more extensively. For exmple, in the United States people begin moving into...

Latest answer posted March 1, 2012, 3:18 pm (UTC)

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Science

The chayote plant seems to be the most versatile of the three, with the tubers being consumable as a starch, the stems and leaves edible as salad fiber. The blue potato plant was mentioned only in...

Latest answer posted April 2, 2012, 9:24 am (UTC)

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Science

The above posts make very good points. As consumers we must educate ourselves on what is and is not healthy for us. The problem is that even reading labels is a complicated process. When my...

Latest answer posted July 12, 2010, 12:16 pm (UTC)

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Science

The question doesn't appear completely, and I can't fix it after editing: A child leaps on a skateboard: A 35 kg girl is running at a speed of 2.8 m/s when she jumps on a stationary skateboard. If...

Latest answer posted October 28, 2013, 5:14 am (UTC)

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Science

You would need to have a live screen capture program that would let you record anything playing directly off your computer screen. There are free programs that would enable you to manage this,...

Latest answer posted May 8, 2012, 10:00 pm (UTC)

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Science

The equation for thermal expansion of Mercury is given by, V(t) = V(1 + 1.82 x 10^(-4)t + 7.8 x 10^(-9)t^2) Where t is in C, and V is the volume at 0 C. The volume 100 cm = 1 m cubes of Mercury at...

Latest answer posted May 15, 2012, 10:51 am (UTC)

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