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Reading Material Quiz Answers - Fall.docx

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Department
Physics
Course
Physics 1021
Professor
Martin Zinke- Allmang
Semester
Fall

Description
READING MATERIAL QUIZ 1 AND 2 FORCES MC01AD001 Physics is applied to biological and physiological systems both at a macroscopic and at a microscopic level The textbook provides reference to both we study the effect of gravity on the otoliths in the macula of the inner ear and we study the effect of gravity on the entire human body Otoliths have sizes in the range of about 5 micrometre and the human body has a size of about 2 m Thus the force concept has physiological relevance at least over 6 orders of magnitude in length of an object In the current context we want to focus on an example of a macroscopic application of the force concept however not to the entire human body but to a body part This is possible as the attached illustrates and many examples in the textbook rely on this approach In the attached figure we consider the three forces T W and F Which of the three forces in the figure isare armcontact forcesA all three forces B T and W armC T and F D W and F armAnswer Key CMC01AD002 Physics is applied to biological and physiological systems both at a macroscopic and at a microscopic level The textbook provides references to both we studied the effect of gravity on the otoliths in the macula of the inner ear and we studied the effect of gravity on the entire human body Otoliths have sizes in the range of about 5 micrometre and the human body has a size of about 2 m Thus the force concept has physiological relevance at least over 6 orders of magnitude in length of an objectIn the current context we want to focus on an example of a macroscopic application of the force concept however not to the entire human body but to a body part This is possible as the attached figure illustrates and many examples in the textbook rely on this approach In the figure we consider the three forces T W and F The armdumbbell has a weight W Why do we not include dumbbellthis force in the list of forces we consider in the text above for the shown figureA The force W acts in another direction than the listed forces and has therefore to be dumbbell omittedB The force W has no reaction force in the figure and for that reason cannot be considered dumbbell in Newtons lawsC The force W does not act on the persons arm and has to be excluded when Newtons law dumbbell is applied to the armD We have already included the weight of the arm W and there is no way to include two arm different weights in Newtons lawsE The dumbbell is not alive and can therefore not exert a force on another object Answer Key C MC01AD003 Tension isA A contactfree force B A contact force C A specific form of energy D A pressure value corrected for the air pressure Answer Key B MC01AD004 Two objects are connected with a string In the quantitative treatment of the problem we assume that the string exerts a tension force of magnitude T on each of the two objects Which of the following assumptions is both necessary and sufficient for us to introduce T as discussed above A the string may hang loose between the objects B the string does not pass over a pulley C the string is massless D the two objects are not on a collision course with each other E none of the above Answer Key C MC01AD005 We consider an astronaut on the moon standing on a scale Hint the astronaut is not in the biosphere so we need to look at Newtons law of gravity which you find in the textbook Dont worry this is the only outofthebiosphere question I have in this set as far as I recall The reading of the scale is less than that on Earth because A The astronaut lost body mass on the flight to the moon B The gravitational constant G is different on the moon C The mass of the moon is less than the mass of the Earth D The air the astronaut carries in a tank pulls himher upwards Answer Key C MC01AD008 Which of the following forces is not a convenience force
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