A student designed an experiment to demonstrate the interaction between Earth systems. The steps of the experi?
A student designed an experiment to demonstrate the interaction between Earth systems. The steps of the experiment are given below. Take a pot full of dry soil. Keep the pot in direct sunlight. Do not water the soil for a week. Observe cracks in the soil after a week. The student’s experiment demonstrates the (A) interactions between the geosphere and hydrosphere during a tornado (B) interactions between the atmosphere and geosphere during a drought (C) interactions between the hydrosphere and atmosphere during a hurricane (D) interactions between the hydrosphere and cryosphere during a thunderstorm
Is a scientific hypothesis accepted if there is no way to demonstrate that the hypothesis is wrong?
If there's no way to prove it wrong (not that it hasn't yet been proved wrong, but literally no way to test it) it's not considered scientific in the least, even in the form of a hypothesis.
Has Einstein’s theory of relativity been proven?
The Theory of Special Relativity is logically derived from two bold postulates which are as presented below:-All laws of nature have the same form in all inertial frames.Speed of Light has the same value in all inertial frames of reference.These postulates are based on Michelson Morley experiment on interferometer which failed to find changes in the speed of light due to increase in the speed of the observer. Maxwell has derived the speed of light as c=1/√(εμ).There is no concept of speed of observer inertial frame in this speed of light. Hence, as all laws of nature have the same form in all inertial frames, the speed of light should also have the same value in all inertial frames as Maxwell's equations and derivations are also a part of laws of nature. This has been empirically proved by Michelson Morley experiment. The special relativity follows from this. Hence, it is based on a logical basis.Based on these two postulates, Albert Einstein derived that measurable length or space do contracts when one travels comparable to the speed of light. In addition, measurable time period dilates when one tries to measure it based on two synchronized clocks. Even mass increases when travelling at high speeds and approaches infinity for speeds close to the speed of light.The concept of time dilation has been empirically proved by time delay in decay of subatomic particles when travelling at high speeds. Time dilation has also been empirically proved by large atomic clocks which were travelled in aeroplanes for considerably long period of time.Even our GPS enabled smartphones won't work properly if relativity effects are not taken into consideration. Even the TV screens of CRT picture tubes were designed in a way to take relativity effects into consideration. One cannot do any experiment in a closed compartment of a swiftly moving train to tell whether the train is moving or at still.Hence, special relativity has been empirically proved. Sufficient experiment is needed to disprove the same.Nevertheless, there is a concept of philosophical scepticism in science and technology. This means that any theory has the tendency of being disproven by sufficient experimental evidence. Theory of Special and General Relativity have also suppressed few fundamental questions. One can go through the following answer to know more about such fundamental suppression:- I.P. K.R. Hirwani's answer to Has Einstein’s theory of relativity been proven?
Why is it acceptable to have more than one dependent variable?
It is a great misconception that you should only have one independent variable. It is actually much more efficient and effective to study multiple independent variables simultaneously. In that way you can study the interrelationships (ie interactions) among the independent variables. However, you have to be careful when you design such experiments. There is considerable literature on this generally under the heading of "Design of Experiments" or DOE. Having more than one dependent variable is perfectly acceptable. You may want to simultaneously optimize many different responses. For example, you might want to increase yield of a certain process while at the same time making it robust to changes in the manufacturing environment. You can imagine that in such a scenario, there might be many different independent variables you would want to study. Doing so one at a time simply would be ineffective from a scientific understanding point of view and incredibly wasteful from a resource point of view.
Whats the main difference between results and conclusion in a experiment lab report?
Results is what happened. Conclusion is what this means. i.e. Result: A popping sound is heard. Conclusion: Hydrogen gas makes a popping sound when exposed to flame.