Science Experiments

Well, fossil fuels are burned which heat boilers, this creates steam which spins turbinescreating electricity.

If the sample of plutonium was the correct isotope and near it's critical mass (300g IIRC) then it would gain sufficient mass to go super critical and undergo fission. This is the principal with which the first ever nuclear weapons were detonated. However if you're firing at a smaller sample it's unlikely there would be anything other than a chemical reaction with the uranium igniting and forming uranium oxide.

Push and pull are examples of contact forces, specifically mechanical forces where objects are in direct physical contact. Twist is a type of torque, which is a rotational force that causes an object to rotate around an axis.

You could try household radiation as a title.

A globular cluster is a part of a galaxy, usually found in the halo surrounding the galactic center. Globular clusters are densely packed groups of thousands to millions of stars held together by gravity. They orbit the center of their host galaxy along with other components such as the spiral arms and bulge.

yes

AIDS

The organelles within a cell, such as mitochondria or ribosomes, are smaller than the cell itself and are considered living components. Outside of living organisms, individual molecules and atoms are smaller than cells.

The element with the largest ionization energy in its period is typically found in the top right corner of the periodic table. This is because elements in this region have the highest effective nuclear charge, making it harder to remove an electron. In general, elements like helium, neon, and fluorine tend to have the highest ionization energies in their respective periods.

It is important because it makes life easier. It also makes our works faster

sometimes it is because you might not know what is going to happen.

homosteis

You are too close to the surface from which the sound waves are reflected. As a result you brain cannot distinguish between the original sound waves and the reflexted sound waves (the echo).

A control group creates a 'yard-stick' to measure any changes in the experiment. For example, suppose you're testing a new diet pill on 100 people - you'd only give the pill to half the group, leaving the other half as a 'control' to see if the diet pill actually works.

Graphs

Any good scientific article should have a list of references, or a bibliography which serves a few purposes. It allows that attribution of credit where it is due. It also allows people to look up further information on the subject if desired. There is also a lot of replication in science (using the same methods, everyone should get similar results). The bibliography helps validate the basis of the experiment.

One note, much of what you find on the internet are secondary sources. I.E. summaries of other studies. Wikipedia is usually a well referenced secondary source.

It is useful to actually find the primary sources which are the original research papers. If you have difficulty finding them, try a good research library at a large university.

Longitudinal section.

It is important to follow an experiment carefully because one mess up and the whole experiment could go wrong or it might change the outcome.

Depending on the experiment, expectation can be very powerful.

In a medical experiment, a control group can help determine whether the drug being tested is responsible for the result rather than expectation or something else.

For a study of a rare occurrence, a control group may help an experimenter determine whether the outcome is due to chance.

Safety goggles are worn by many crafts and trades, in order to protect the eyes. In the case of scientists, splashes from acids or alkalies would be a pretty obvious hazard.

The answer is a theory or a model.

That is a hypothesis.

The hypothesis states what question you are studying. If there is no hypothesis, one wouldn't know what one is studying, so it's impossible to construct a controlled experiment.

They make experimental condensation of the eutrofication.

! ;)