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Unformatted text preview: Physics 1 First Midterm Exam (AM) 1/27/2009 Name: 3 0" U T’ old 3 ,. 1. (This problem is worth 40 points.) A painter is standing on a platform that is being raised at constant
speed. As the painter travels upward, he accidentally nudges a can of paint off the platform when it is a distance D above the ground. The can hits the ground a time T after it falls off the platform. You can ignore air
resistance. (a) Using the axes below, draw a 31—: graph and a vy—t graph of the motion of the can of paint. On both graphs
P label (1) the time when the can leaves the platform (ii) the time when the can is at its maximum height, and (iii)
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(b) Find the speed of the can just before it hits the ground. Your answer should involve no quantities other
than D, T, and g. (It may or may not involve all of these.) For full credit, show your work and draw a box
around your answer.
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E 2. (This problem is worth 40 points.) A ball is fired from the Time cliff is reach€d= ? (1 a, H S d t ”T = '1‘
ground at an angle 04) above the horizontal. The ball is thrown at pee a C], / exactly the right speed so that itjust reaches the top of a cliff of ’
height H. Air resistance can be ignored. (a) Find the elapsed time from when the ball is launched to
when it just reaches the cliff. Your answer should involve no quantities other than H, 04,, and g. (It may or may not involve all of these.) For full credit, Show your work and draw a box
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'B’Fgw’r (WA) VX Vomg sto my" ._ @C‘Otng’ Physics 1 First Midterm Exam (AM) 1/27/2009 Name: saw 7" m g 3. MULTIPLE CHOICE. (This problem is worth 20 points.) For each question, draw a circle around the one best answer. Each question is worth 4 points. There is no
penalty for guessing. (a) Three vectors are given as shown. The scalar product 6—5;! is
closest to is aavmmmm”
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(045 w are about (e)(8)(—a3)emW "5 ”6'“ (b) At a certain instant an object has the following velocity and acceleration:
a = (2.00 m/s)i+(~3.00 m/s)}+(~3.00 m/s)12 6 a = (2.00 m/s2)i+(—4.00 m/sz)j+(8.00 Ill/52)];
At this instant, what is the object doing? .3
. ct: V at + V 4 V 6t (i) Speeding up and following a curved path V K K Y 2’ lb ,1! 2: (ii) Speeding up and moving in a straight line :— [(2.00) (’2 . 00) ‘l‘ (3. Oﬁ)(‘i.00) + 63_m)(8.00U
in) owrng own an o ow1ng a curve pat w: 1/33
(iv) Slowing down and moving in a straig ine ___.[ 00 .410 ”29.0, m1 3 _ __ . L .
(v) None of the above  LL " J A " 32' O M 1/33 (c) A projectile is launched at a 30° angle above the horizontal. Ignore air resistance. The projectile’s , L:
acceleration is greatest at This is Mﬁ—aoiwe, so V9: Zara walla“ 90°aP4ﬂL. 3: (i) at a point between the launch point and the high point of the trajectory (ii) at the high point of the trajectory
,i—r Li (iii) at a point between the high point of the trajectory and where it hits the round
( (iv) misleaging quest‘iﬁi n — :36 acceleration is the same (but nonzero) at all points along the trajectory i
(v) mis ea ing ques lOl’l — e cce era ion is zero a a pomts a ong e trajectory Q a hallmark— “? PM) i (e
(d) You drive a race car around a circular track of radius 200 m at a constant speed of 200 km/h. If you then 31"
drive the same car around a different circular track of radius 100 m at a constant speed of 100 built, your
acceleration will be _ 2 7. 2
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(e) Which of the following situations is impossible?
(i) An object has constant nonzero velocity and changing acceleration. \ , _,. ‘3
(it) An object has velocrty directed east and acceleration directed east. l \II = Gaugizuoh ,1
(iii) An object has constant nonzero acceleration and changing velocity. + “J /
(iv) An object has velocity directed east and acceleration directed west. ““43 (4321 g 5 €— EP/fz. _ ,
(v) An object has zero velocity but nonzero acceleration. +64 01239? I
(vi) More than one of the above. QCCBi m Ca“ 'i‘ 0% (tic H— dialﬁvi‘
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 Winter '08
 Fridluund
 Physics

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