oldmidterm5 #2 - hinojosa (jlh3938) oldmidterm5 02 Turner...

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Unformatted text preview: hinojosa (jlh3938) oldmidterm5 02 Turner (58185) 1 This print-out should have 34 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Needing help, the secretary of the United States Department of Agriculture asked your teacher, If a chicken-and-a-half can lay an egg-and-a-half in a day-and-a-half, how many days will it take three chickens to lay twenty- eight eggs? Please help your teacher select the correct answer to the secretarys question. 1. Three chickens will lay twenty-eight eggs in twenty days. 2. Three chickens will lay twenty-eight eggs in sixteen days. 3. Three chickens will lay twenty-eight eggs in twenty-two days. 4. Three chickens will lay twenty-eight eggs in twelve days. 5. Three chickens will lay twenty-eight eggs in fourteen days. correct 6. Three chickens will lay twenty-eight eggs in twenty-one days. 7. Three chickens will lay twenty-eight eggs in fifteen days. 8. Three chickens will lay twenty-eight eggs in twenty-four days. 9. Three chickens will lay twenty-eight eggs in nine days. 10. Three chickens will lay twenty-eight eggs in eighteen days. Explanation: Basic Concept: The information given in the question is the rate of egg production in one instance and you must make this rate compatible with another instance. The rate of egg production is constant. The number of eggs per chicken per day is a constant. Solution: Since it takes a chicken-and-a-half a day-and-a-half to lay an egg-and-a-half, it will take one chicken one-and-a-half days to lay one egg. Therefore, to lay twenty-eight eggs it will take three chickens fourteen days. Alternative Method: Unit analysis is basic to every physics problem and is central to this problem. The rate of egg production is the number of eggs produced per chicken per day. In the given instance the rate is rate = { 3 / 2 eggs } { 3 / 2 chickens } { 3 / 2 days } = 2 3 eggs chickens days . (1) In the requested instance, the number of chickens is (3 chickens) and the number of eggs is (28 eggs). The number of days N is to be determined. Therefore in the requested instance, the rate is rate = { 28 eggs } { 3 chickens } {N} . (2) The rate is constant, so equating the rates Eqs. (1) and (2), we have 2 eggs 3 chicken days = 28 eggs 3 chickens N Solving for the number of days N , we have N = 28 eggs 3 chickens 3 chickens days 2 eggs = 14 days . The correct answer: Three chickens will lay twenty-eight eggs in fourteen days. Note: The early chicken catches the worm. 002 10.0 points A weight (with a mass of 26 kg) is suspended hinojosa (jlh3938) oldmidterm5 02 Turner (58185) 2 from a point near the right-hand upper end of a uniform boom whose mass is 15 kg . To support this boom, a cable runs from this same point on the boom to a point on the wall (the left-hand vertical coordinate at a height of 10 m) and by a pivot (at the origin of the coordinate axes) on the same wall.coordinate axes) on the same wall....
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oldmidterm5 #2 - hinojosa (jlh3938) oldmidterm5 02 Turner...

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