What are the 3 widely used system of units?(physics)?
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Metric System\nKg, m, sec\ng, cm , sec\n\nBritish System (or Imperial System)\nlb, ft, sec
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Physics is the scientific study of matter and energy and how they interact with each other.\n\nGood reading on the daily use of physics at such as levers, wheels and axles, inclines, screws at:\n\nhttp://physics.about.com/od/physicsintherealworld/
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1. What is Physics and Who Uses It?\n2. Introductory Calculus\n3. Vectors\n4. Forces and Newton's Laws\n5. Kinematics\n6. Displacement Curves and Derivation\n7. Circular Motion\n8. Moments and Torque\n9. Work, Energy and Integration\n10. Momentum and Collisions\n11. Static Equilibrium\n12. Dynamic Equilibrium\n13. Moment of Inertia\n14. Gravitational Fields\n15. Electric Fields\n16. Static Electricity\n17. Resistance Ohm's Law\n18. DC Circuit Analysis\n19. Capacitance and RC Circuits\n20. Magnetic Fields\n21. Magnetic Force and EMF\n22. Inductance and RL Circuits\n23. AC Circuit Analysis\n24. Electromagnetic Waves\n25. Heat\n26. Thermostatics\n27. Thermodynamics\n28. Pressure\n29. Optics\n30. Modern Physics\n31. Quantum Theory\n32. Relativity\n33. Energy Conversion\n\nThese are my "on the fly" idea I may have forgot a thing or two and some topics can certainly be combined or separated, but I feel these to be the most important aspects of physics.
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The SI (metric) unit used to measure mass is the gram.\n\nThe Imperial (English) unit used to measure mass is pounds and ounces.
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In terms of mass.\nThe SI unit for mass is the kilogram (kg).\n\nDo not confuse mass with weight, they are not the same thing.  The mass of an object is constant throughout the universe where as weight is a vector force that depends on the gravitational field around the object.  It is unfortunate that these two words are used interchangably sometimes.
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math, physics, astronomy
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1.  Physics trilogy: E=mc2, m=E/c2, c2=E/m.\n\n2.  All mass and energy forms are wave composites, having the value of "hf" as its basis.\n\n3.  Our physical composition is that of physical time, (c2=E/m) its duration being equal to the value of the chronon, or complete electron wave.  This value disallows travel to either ones own past or future.\n\n4.  If a premise is wrong, a right answer is wrong.\n\n5.  A person goes through life but one time.
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Physics (from the Greek, φυσικός (physikos), "natural", and φύσις (physis), "nature") is the science of the natural world, which deals with the fundamental constituents of the universe, the forces they exert on one another, and the results of these forces. Sometimes, in modern physics, a more sophisticated approach is taken that incorporates elements of the three areas listed above; it relates to the laws of symmetry and conservation, such as those pertaining to energy, momentum, charge, and parity.[1] Physicists study a wide range of physical phenomena spanning all length scales: from the subatomic particles of which all ordinary (i.e., baryonic) matter is made (particle physics) to the behavior of the material universe as a whole (cosmology).
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the atom is the most basic unit of matter
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Yes.\n\n"The metre or meter (symbol: m) is the SI base unit of length."\n\n"Metre" is just the European way of spelling "meter."
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This is really simple stuff. Newtons is force, seconds is time, meters is length, and meters per second is length per time, or velocity.
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Just let the units tell you what to do.  H=mass* T*sp heat.  with T in K
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Science:\nWhat are 4 different measurements for temperature?\nFahrenheit, Celsius, Kelvin and Rankine\n\nWho really invented the radio? NOT Marconi but\nNikola Tesla\n\nWhat is "paper money" made from?\nCotton\n\nWhat is the old-fashioned word for silver?\nArgent\n\nHow is mass different from weight?\nMass measures the amount of atoms in an object, weight is a measure of mass multiplied by earth's gravitational strength\n\nLiterature:\nHow many letters are in the alphabet?\n26\n\nWhat are the first 3 letters of the Greek alphabet?\nAlpha, Beta, Gamma\n\nWho was Samuel Clemens known as?\nMark Twain\n\nWhat is the equivalent of a paragraph that is used when writing poetry?\nA stanza\n\nGeography:\nWhat is the name of an island that will most likely be the 51st state?\nPuerto Rico\n\nWhat is Pennsylvania's nickname?\nThe Keystone State\n\nWhich way do lines of latitude go?\nWest to East\n\nHow are they measured?\nDegrees and minutes\n\nMathematics:\nIs 9 a prime number?\nNo\n\nHow many is a gross?\n144\n\nWhat are the two axes on a graph?\nx and y\n\nWhat is pi used for?\nArea, diameter of a circle\n\nWhat can pi be substituted for?\n3.14
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Newtons is the unit for measure of force
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#1 is 400N :)\n#3 is 350N
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Yes, you need to convert relative standard derivation to standard derivation first. Use relative standard derivation times the mean.\n\nIn the question, I didnt see anything about number of measurements, so there's no way we can tell n. Since we dont know the number of measurements, we cant tell which distribution, Students' T  or normal distribution, we should use. Look into the questions again, with this much info, we cant do nothing here.
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The International System of Units (abbreviated SI from the French language name Système International d'Unités) is the modern form of the metric system. It is the world's most widely used system of units, both in everyday commerce and in science.\n\nThe older metric system included several groupings of units. The SI was developed in 1960 from the metre-kilogram-second (MKS) system, rather than the centimetre-gram-second (CGS) system, which, in turn, had many variants.\n\nThe SI introduced several newly named units. The SI is not static; it is a living set of standards where units are created and definitions are modified with international agreement as measurement technology progresses.\n\nWith few exceptions (such as draught beer sales in the United Kingdom), the system is legally being used in every country in the world, and many countries do not maintain official definitions of other units. In the United States, industrial use of SI is increasing, but popular use is still limited. In the United Kingdom, conversion to metric units is official policy but not yet complete. Those countries that still recognize non-SI units (e.g. the US and UK) have redefined their traditional non-SI units in terms of SI units.\n\nFor more information about the SI base units visit: http://en.wikipedia.org/wiki/SI#Units