What causes scientific knowledge to change and grow?
Scientific knowledge changes with the growth of accumulated knowledge, technology, and greater experimentation. With further experimentation and more technology allowing more detailed experimentation, scientific knowledge constantly grows and changes.
What are two positives and two negatives of raising the minimum wage?
Positive:
1. Keeps more teenage workers fairly paid
2. Does not cause a decrease in unemployment
Negative:
1. Encourages employment of more illegal aliens
2. Decreases competitive wages for workers in general
Is it possible for a PowerPoint slide show to run on you-tube?
Video the presentation and then upload it to You Tube. When you are videoing it, make sure it is on a correct kind of monitor, ideally on a laptop. Otherwise you will see lots of lines appearing on the video of the Powerpoint show.
What is family disorganisation?
A breakdown of a family system. It may be associated with parental overburdening or loss of significant others who served as role models for children or support systems for family members. Family disorganization can contribute to the loss of social controls that families usually impose on their members.
What is psychosomatic blindness and why do people get it?
Psychosomatic blindness is a conversion disorder in which an individual reports being blind without any physiological etiology. It mainly affects the sensory system (e.g., blindness) and nervous system (e.g., paralysis) and is usually transient. It often exhibits inconsistencies (e.g., the "blind" person is able to navigate around barriers), Because the physiological mechanism is not actually damaged and can still influence unconscious processing, it therefore results from an inhibition or re-organization of neural pathways that prevent sensory information from reaching conscious awareness. As the exact etiology of consciousness and what neurological activity produces what conscious experience remains a mystery, so does the exact etiology of psychosomatic symtoms/conversion disorders.
Freud believed that the anxiety of the psyche was sometimes "converted" into physical (aka, somatic) form for lack of a more regular or appropriate place to go (conservation of psychic energy).
It can be caused by traumatic events. In some such cases, the afflicted body part will have been "guilty" of some act or failure, thus providing the mind/brain a reason to inhibit conscious use of it.
Social being is being able to get out there and just be yourself without having to pretend. Being able to communicate to people comes under social being. Without it, we would basically have no life and even if we did, we would have a pretty bad one. Having good communicatin skills and being brave enough to stand up for yourself and others around you is also social being.
Social being is something that helps us through our everyday lives. In society today we are surrounded by social encounters. We must socialize to earn friends, socialize to earn confidence, and socialize to have a healthy family relationship and private relationships.
What are primary social groups?
Primary social groups are the main groups to which people belong. A great example of a primary social group would be the family.
Which quantity is independent of the size and shape of an object composed of a given material?
I can think of the Density, and the Specific Heat for a start. Various others also apply such as Thermal Conductivity and Electrical Conductivity, Dielectric Constant. You could also add Melting Point, Evaporation Point. In fact anything which is a property of the material not the object.
What are the cause and effects of toxic gases?
The cause of toxic gases are of pollution being polluted on Earth. The effect is causing living organisms near it to die.
Is advertising a good thing or a bad thing?
It's a good thing because you can get lots of money IF the people buy your products. If not, it's just a waste of time and money, as ads cost LOTS of money.
Can you tell why the evergreen forest is like the lungs of the earth?
Forests are often referred to as "the lungs of the earth", probably by folks who have no idea about what lungs do except that it has something to do with air. Lungs extract oxygen from the air and provide it to the body for conversion of food (e.g. sugar) to carbon dioxide. Trees absorb carbon dioxide and convert it to oxygen and sugars through photosynthesis - the dead opposite of the lung/body function. Trees might better be called the "anti-lungs" of the Earth as they do this opposite function. Even calling them the scuba tanks of the Earth might be more correct as they supply oxygen to living organisms. Most accurate would be to call them the oxygen factories.
How are bimetallic strips used in electric irons?
It is used as a thermostat.
A thermostat is a device used to control the temperature of any equipment, in this case an electric iron.
Two little strips of different types of metals are welded or brazed together. These little strips will be mounted inside the the iron near to the hot plate, held down just at one side.
An electrical contact will join the bimetallic strip into the electrical circuit of the iron. Another little flat metal plate will be mounted near the free end of the bimettalic strip. This little fixed plate will touch the free enf of the bimetallic strip.
So now you turn the iron on. The irons' hot plate heats up. The bimetallic plate heats up too as it is close to the hot plate.
Ok, now is the clever bit someone once thought out. The two strips of metal heat up and expand. As the properties of the metals are different they will expand at different amounts. As the two strips are stuck together the bimetallic strip will bend.
When it bends it will eventually bend away from the fixed plate. Assuming its been installed with the bimettaic strip the right way around! because the strip will bend to the side which has the metal that expands less. When it no longer touches the plate the circuit will turn off. And hence the power is turned off to the iron.
So how come that dial makes the iron hotter or less hot? When you are twisting the dial you are actually squeezing some tension into the bimetallic strip so that it will have to get hotter before it will bend away from the contact and hence break the circuit.
How are cave formations formed?
usually the rock is limestone, and some chemicals in nature react with it.
It could also be prolonged exposure to water waves, or other deformations.
+++
To clarify the first sentence, the accepted meaning of the term cave formation as a noun, when referring to caves in limestone as the vast majority are, is "speleothem": stalactites, stalagmites and similar. These are deposits of calcite precipitated from solution in ground-water.
Mechanical weatheringby water can produce wonderful shapes but in limestone it is still an adjunct to the primary process ofdissolution.
How did life in the Nile River valley differ from life in the Tigris-Euphrates Valley?
Both civilizations were very structured. However, the Tigris and Euphrates were much less predictable than the Nile was and flooding was not as able to be as planned for in the Tigris-Euphrates Valley as it was in the Nile River.
How many bones in the middle ear?
The middle ear contains three tiny bones known as theossicles:malleus,incus, andstapes
Definition of conventional energy?
Power provided by traditional means such as coal, wood, gas, etc., as opposed to alternative energy sources such as solar power, tidal power, wind power, etc. (Source: PHC)
A social agency is usually a type of social services. They can provide food assistance, cash assistance of medical assistance. They are usually run by the county or state you live in.
The Standard Occupational Classification (SOC) categorizes jobs into 23 major groups of occupation.
What is another name for an ecosystem?
An ecosystem refers to a relational community that interacts within a time and space in such a way that sustains life.
The third highest mountain range in the world?
Mt. McKinley (Denali) is the only 20,000 ft. mountain outside of the Himalayas and The Andes, so from that point of view, the Alaska Range could be called the third highest mountain range in the world.