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Unformatted text preview: PHYS 218, Exam 1 Name: E4 BN4Â» 11144.2( (Last) (First) (Middle) 1. Recor.s your twoâ€”digit exam version number on the scantron form in the ï¬eld â€œTEST / QUIZ
NUMB . I . 2. Write your name here and on the scantron form. 3. Record your PUID number in the â€œSTUDENT IDENTIFICATION NUMBERâ€ ï¬eld on your scantâ€” ron form. 4. A numeric answer that is correct to within 1% error is considered correct. 1. An airplane starting from rest must reach a speed of 215 miles/ hour Within 5 s in order to take off.
What is the minimum value of the acceleration that will allow the airplane to take off? 1 mile = 1609.344 In; 1 hour 2 3600 s. (a) 43.0 m/s2 (d) 480.6 m/s2 (b 1075.0 m s2
(c) 19.2 m/s2 (e) None of the above.
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A}: _, (ll?) '( â€œr > x hilt: K 36095 M W AJ. * â€ï¬rm (in â€˜51 2. A jogger starts off running down a perfectly straight road. He maintains a speed of 3.8 m/s for
200 s until he notices that he dropped his iPod. He abruptly turns and traces back along his route
at a speed of 1.60 m/s for 50 m until encountering his iPod. What was the joggers average velocity
between the time he started running and the time he encountered his iPod? Consider the joggerâ€™s
original direction to be the positive direction. (a) 2.941 m/s (b) 3.503 m/s
(0) 3.800 In/s (e) None of the above. 33100 : 760 hf AX 7 (0 u
0"â€ 2 g fâ€œ = â€œf
10 Â«Tu: p+ 217â€˜ â€˜ 15 S n}: = 3.0703 3. In a famous fraternity prank at MITmintended to demonstrate that any ï¬xed length object could
deï¬ne a system of measurement~01iver R. Smoot was layed headâ€”toâ€”toe 364 times across the
Harvard bridge. Thus the Harvard bridge was measured to have a length of 364 â€œSmootsâ€. Supposing
that the bridge is 7 Smoots wide, what is the area of the Harvard bridge, measured in mg? Area 2 Length X Width; 1 Smoot = 1.702 m. iai 1953 m2 (d) 1497 m2 (c) 4337 m2 (e) None of the above. 7.
AMâ€˜ gkï¬ guts,â€œ X 7 SW5 â€™3. 2,546 55nd} Q 1 702 uâ€™" L z u" â€˜ l
3,54% 9 â€œh, X 3. Swat 7'58\ w. 4. Two books of mass m1 = 1.0 kg and m2 = 0.5 kg are stacked on a table as shown in the ï¬gure
below. What is the magnitude of the normal force acting on the topmost book? (a) 0 N (d) 9.80 N
b 14.70 N
(c) 4.90 N (e) None of the above. Ecol; â€œâ€™5 0+ (13* (C'Mslawb mlï¬bï¬ =3 D) So} 5. A car is moving along the horizontal direction toward the left. The driver kills the engine and coasts
to a stop. Which of the following could be the free body diagram representing the horizontal forces
on the car as the car is coasting to a stop? (e) None of the above. â€”â€”â€”Â» awÂ» Tim m â€Wt 43 Â«CmÂ» wk; â€œA "â€™ AhabÂ». Jco imv; (LL wï¬ivm  6. Suppose you are working out a difï¬cult problem in energy conservation. You Google up a promising
looking equation but it is from a website that you donâ€™t fully trust. The equation is, E=M02+ F333
â€”â€” â€” 70:0 A Check this equation by carrying out dimensional analysis. The units for the variables are: c E: kg m2/82 oM:kg o 9: m/s2 0 6: m/s F: kg m/s2
:0: m
A: m2 7: kg/8 What is the strongest conclusion that you can draw from a dimensional analysis of this equation alone? (a The e uation miht be correct. (b) The equation neglects friction. (c) The equation is deï¬nitely incorrect. (d) The equation is deï¬nitely correct. (e) None of these conclusion can be drawn from
dimensional analysis. 3/ m if: â€œ3â€” M
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WATT? be, OLâ€˜ 7. Two notâ€”tooâ€”bright furniture movers are shown below pushing a refrigerator. â€”> positive direction The mover on the left pushes with a force of 287 N. The mover on the right pushes with a force
of â€”82 N. The refrigerator has a mass of 61 kg and accelerates at 0.05 m/s2 toward the right (i.e.
toward the positive direction indicated on the ï¬gure). What is the force exerted by the refrigerator
on the mover on the right? (a) â€”201.9 N ((1) â€”205.0 N
(b) 205.0 N
(c) 0 N (e) None of the above. 4â€œâ€ M JVL N lid. bxw'i'c
it grglbo \ no um; 3'31 Lou.) whyâ€œ: Q?â€œ +ch it feels =3â€œ Â« QM of . +83 N w MM? 8. A car is sitting at rest on a hill with a constant incline, similar to a demonstration considered in
class. The driver releases the break and the car rolls downhill. Which of the following curves could
represent the acceleration of the car along the direction of travel as a function of time? Consider
only the time period just after the break is released until the car is part way down the hill. The
positive direction is downhill. E ' : i; cowSinai:
g â€œW Iii) +LÃ©â€˜t (d) 0 time (s) (b) 0 time (S) (e) None of the above. (News â€˜vI'L outtake 9. You try to toss a screwdriver up to your father who is working on a roof. The distance from your
hand to his hand is 10 m and your toss comes 2.0 m short of reaching him. What was the initial
speed of the screwdriver just after it left your hand? Neglect air resistance. (a) 12.522 In s (d) 15.336 m/s (b) 1. 278 m/s (c) 2. 556 m/s (e) None of the above.
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10. Consider the following plot of position vs. time.
E
Q
.9
5%
Q
0 1 2 3 4 5 time (s)
For what time interval is the average speed the smallest?
(a)1t02s (d)3to4s
(b) 2 to 3 s
(c)0t01s (e)4t055 ...
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