Uncertainty in P261

Uncertainty in P261 - 1 Exactly approximate":...

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Unformatted text preview: 1 Exactly approximate": The Problem Think about the following. You are in the laboratory using a scale to determine the masses of two blocks of wood. What you see on the scales is shown below: The following discussion takes place between you and your friends concerning the left hand scale: A I think that the reading on the left hand scale is exactly 48.0 grams. B I think that the reading on the left hand scale is approximately 48.0 grams. C I don't agree with either of you. With whom do you most closely agree? Explain your choice carefully. I agree with answer A because the scale is clearly on the 48g mark.-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- The following discussion takes place between you and your friends concerning the right hand scale: A I think that the reading on the right hand scale is exactly 48.0 grams. B I think that the reading on the right hand scale is approximately 48.0 grams. C I don't agree with either of you. With whom do you most closely agree? Explain your choice carefully. I agree with answer B because the scale is close to the 48g mark but not directly on it.-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Compare your answers above for the two scales. Explain why they are the same or different. They are different because the readings are not exactly the same. ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Clearly the reading on the scale for Block One is exactly 48.0 g. However, does this mean that the mass of the block is exactly 48.0 g? The following discussion now takes place between you and your friends concerning Block One: A I think that the mass of the block is exactly 48.0 grams. B I think that the mass of the block is approximately 48.0 grams. C I don't agree with either of you. With whom do you most closely agree? Explain your choice carefully. I agree with answer B because there is an error based on the accuracy of the instrument. ------------------------------------------------------------------------------------------------- The lecturer comes along and wants to measure the mass of one of your blocks of wood. The lecturer puts the block on an electronic balance and the display of the balance shows:...
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Uncertainty in P261 - 1 Exactly approximate":...

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