Question

What determines the difference between scientific knowledge and non-scientific knowledge?

Give an everyday example that illustrates the difference between acceleration and velocity. Give an example of uniform and accelerated motion.

Why do people mistake what is in diet energy drinks for actual energy?

Think about your energy intake today. Pick one food and identify the chain of energy that led to it. What trophic level do you eat from most? Where will the energy that you ingest eventually wind up?

Compare the thermal conductivity of metal vs. wood.

Describe the movement of electrons required to develop electrical current.

How do reading glasses work? Describe how the light is interacting with the lens.

If you went into a disaster shelter, could you get cell phone service inside? What kinds of electromagnetic radiation could this shelter protect you from? For example, does light pass through the shelter, get absorbed by the shelter, is it reflected by the shelter or does light interact with the shelter in a variety of ways?

Research and report on the following properties of all elements on the periodic table in Group IIA: physical properties of each element (color, texture, mass) and chemical properties of the elements (density, crystal shape, etc.).

List and give an example of an object around you for of each of the different types of chemical bonds.

Answer 1

• scienctific knowledge :-systematic process for acquiring new knowledge that uses the basic principle of deductive (and to a lesser extent inductive) reasoning.
• Non Scientific knowledge :-about the world using techniques that do not follow the scientific method.
• Elevator is an example of acceleration and velocity of everyday life.
• Examples of uniform acceleration would be of a body falling freely under the influence of gravity.
• Because most people are not educated or smart enough to think about chemical and biological processes

• If you pick a food like a steak, for example, you could talk about how the sun provides energy to pasture grass, the pasture grass provides energy to cows, and then the cow provides energy to you when you eat it. The energy that you consume from this steak could be lost through physical activity, body heat, or you may crap some of it out. The energy you crap out will likely make its way back to plants (which are the bottom trophic level) as a fertilizer. I think you'll find that most people eat from the bottom trophic level (e.g. plants and plant based products) since there is more available energy in this tropic level. This also explains why many larger animals (e.g. whales, elephants, etc. ) also feed on organisms near the bottom of the food chain.

• Thermal conductivity is measured in units of watts per meter per kelvin. Wood is a very poor conductor of heat. Depending on the type of wood and its water content, the measurement of thermal conductivity of wood ranges from 0.04 to 0.4. Metals, however, are generally very good conductors of heat. They range from about 6 for titanium to as high as 400 for pure copper.

• Current is the flow of electrons through a conducting substance. Each electron carries an electric charge - so as electrons pass through a substance, such as a metal, then we say an electric current (made up of the electric charges that each electron carries) passes through that substance. We measure current in amperes, often calls "amps". Voltage refers to the potential difference of the electric charge across a boundary or between two points. So if we were to have a high accumulation of electrons in one place (lets say on the ground), and not very many electrons in another place (say in a cloud), then we would say there is a potential charge, or a voltage that we can measure between those two points. Electrons repel each other, and they are attracted to areas where there is a deficiency of electrons. So the force of the electrons trying to move away from other electrons, and towards areas of fewer electrons, is the voltage, and the actual flow of these electrons is the current.

• The inability to clearly see near objects is called hyperopia and is generally caused by refractory error of the eye's lens. Reading glasses change the angle at which light enters the lens, compensating for the refractory error and allowing light to focus appropriately on the macula.

• 1.Covalent bond- water 2.ionic bond-Nacl common salt 3.Metallic bond- Copper

• It's possible to have windows made of lead glass that will block (well, attenuate) ionizing radiation but let light through. Rather expensive for a home-made fallout shelter. It's also possible to make a simple periscope - gamma rays and X-rays would go right through the mirror into the shielding material behind (dirt, concrete).
  But if you really thought you were going to be seeing a nuclear weapon, well, atomic bombs emit enough visible light to be dangerous, so you'd want to block that, too, or at least have some kind of shutter over your periscope.Tunnels and underground bunkers won't have cellphone coverage unless someone installed a leaky feeder.

• The alkaline earth metals are the series of elements in Group 2 of the periodic table. The series consists of the elements beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra) (though radium is not always considered an alkaline on earth due to its radioactivity).

  Properties

  The alkaline earth metals are silvery colored, soft, low-density metals, though are a bit harder than the alkali metals. These elements all have two valence electrons and tend to lose both to form ions with a two plus charge. Berylium is the least metallic element in the group and tends form covalent bonds in its compounds.

  These metals are less active than the alkali metals, but are still fairly active. They react readily with halogens to form ionic salts, and can react slowly with water. Magnesium reacts only with steam and calcium with hot water. Beryllium is an exception: It does not react with water or steam, and its halides are covalent. The oxides are basic and dissolve in acids and the hydroxides are strong bases, though not as soluable as the alkali metal hydroxides.