lab for geology, it is too easy

uhqn1994
timer Asked: Jan 29th, 2017

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Lab 1.1 Make Up Name: Major: What you expect from this class in about 6 words: Define density mathematically (formula) and in your own words: Calculate the density of an object which has a volume of 13cm3 and a mass of 1 gram. Show your work, don’t forget units. Convert that density to units of milligrams and milliliters. Show work. Define precision: Define accuracy: Determine the precision and accuracy of these images. If the shots are precise, check the “precise” box. If they are accurate, check the “accurate box”. If they are both, check both boxes. Accurate? Accurate? Precise? Precise? Accurate? Accurate? Precise? Precise? Define detection limit: Define in your own words, error: Define resolution (as used for measurements or screen dimensions): Read all of this and follow along: Error in science is something that encompasses every measurement. There is no such thing as an errorless measurement. Here is an example of ‘error’ not involving a true measurement. This is just to illustrate a point. When we give somebody our age we will typically just state a number, say 22. But, that is not your true age is it? If you gave that information at exactly 22 years after the exact moment of your birth, then it would be accurate. Any other time, you would actually be 22 years XX months and yy days and zz seconds old. Since time or birth around the world is typically recorded as Hour: minutes (e.g, 4:30), you will never have the resolution of ‘seconds’ to count in your measurement. Here is an example of error in a measurement: Set your screen zoom to 100%. The line below appears to ~5.8 cm correct? If you are on a computer, zoom into 440%. You’ll notice that the line actually falls just before the 5.9 cm mark, but not directly on it. Well how long is this line then? To figure that out we would need to know how thick the line on the ruler is and then divide that up into units smaller than mm, which is impossible to do because your eye can’t see micrometers! But, for the space between the lines, you can see that well enough to at least see if the line is closer to the tick mark after or before its own end. Usually people with 20/20 vision are able to divide that space into at least two distinct halves, perhaps even into 4 parts. For this instrument, the detector is your eye so defining error on a ruler is not as precise as defining error on a mass spectrometer. For our purposes, we can measure up to ± .5 mm. So, every measurement we make is then understood to be ± .5mm. For our line below, that means if we measure it to be 5.90 cm, it could actually be 5.85 cm or 5.95 and anything in-between. Again, this measurement also required me to line up the line perfectly on the ruler, which I didn’t do a very good job of. The computer says the line is 2.4 inches. What is that in centimeters? Millimeters? Show your work. Calculate the volume of a cylinder which has a radius of 5 cm and a height of 5cm. Show all work. Suppose that cylinder was made of aluminum and you had another one made of quartz. How heavy are the cylinders in grams? Show work. (Hint: you need to look up the densities of those materials) This lab used water displacement to measure volume of an object. Describe to me what that is in a few sentences and also which scientist first discovered this (Hint, he is very, very, very old and Greek).
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