PHYS1100_Fall2000_FinalExam_Solutions

# PHYS1100_Fall2000_FinalExam_Solutions - PHYS-1100 Final...

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PHYS-1100 Final Exam, Spring of 2000, Form 3 To safely (the word is used here very loosely) land on an aircraft carrier deck a jet aircraft must be slowed from an approach speed of about 70 m/s (150 mph) to rest within a distance of about 90 m (300 ft) by engaging its tailhook with one of a set of arresting cables. Presuming that the acceleration of the aircraft is uniform (it really isn’t) answer the following questions . 1. Which of the position versus time graphs shown below most appropriately represents the motion of the aircraft during the landing? * 2. Which of the velocity versus time graphs shown below most appropriately represents the motion of the aircraft during the landing? * 3. Approximately how much time is required to bring the aircraft to a halt? a) 1.3 s * b) 2.6 s c) 4.1 s d) 7.14 s e) none of the above are even approximately correct 4. What is the approximate average acceleration of the aircraft, expressed in terms of “g’s” where one “g” is the gravitational free-fall acceleration (9.8 m/s )? 2 a) 1.1 g b) 1.9 g * c) 2.8 g d) 4.2 g e) none of the above are even approximately correct 5. Graphically, the distance traveled by the aircraft during landing is represented by a) the slope of the position graph b) the slope of the velocity graph c) the area beneath the position graph * d) the area beneath the velocity graph e) the area beneath the acceleration graph

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A 15 gram marble is launched at 12 m/s, horizontally, from a spring gun at a height of 2.0 m above level ground. This spring had to be compressed 5.0 cm. Answer the following questions, neglecting any effects of air resistance: 6. For how much time, after it leaves the gun, is the marble in flight? a) 0.17 s b) 1.2 s * c) 0.64 s d) 2.3 s e) none of the above are even approximately correct 7. How far, horizontally, did the marble travel before striking the ground? a) 6.0 m * b) 7.7 m c) 9.1 m d) 11 m e) none of the above are even approximately correct 8. What is the required spring constant for the spring used in the gun? a) 530 N/m b) 680 N/m c) 780 N/m * d) 860 N/m e) none of the above are even approximately correct 9. During the marble’s flight, its motion is best described as a) constant speed b) constant velocity c) constant displacement d) constant acceleration e) none of the above (a-d) 10. At the moment just before impact with the ground, the speed (magnitude of velocity vector) of the marble, compared to its speed at the moment it left the gun, is a) greater b) the same c) lesser
An 959 kg racing car is rounding a level, unbanked curve at a steady speed of 28 m/s. At any faster speed it is

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## This note was uploaded on 12/01/2011 for the course PHYS 1100 taught by Professor Giomanico during the Spring '08 term at LSU.

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PHYS1100_Fall2000_FinalExam_Solutions - PHYS-1100 Final...

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