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Unformatted text preview: Narne (please print): Last First
Section Number (e.g. M014) SUlD Physics 211, Spring 2011 Exam 1 (11:00am lecture) Document your work or earn no credit. Use the back of each sheet if you run out of space. Cross over
any parts that correspond to given up thoughts. For numerical answers give at least 2 signiﬁcant digits
and specify units. " l. A high speed train is slowing along a straight section of the railroad from 320 km/h to 200 km/h over
a distance of 40km in 11 minutes. a) [10 pts] What is the average velocity of the train in this time interval? Express your result in km/h. b) [10 pgs] What is the average acceleration of the train in this time interval? Express your result in
km/h . Phy211 Spring 2012 Syracuse University Exam 1 (11:00 am) Page 1 2. Vectors A and B are shown below. Using graphical method to perform vector algebra ﬁnd a vector C (sketch your method not just the
ﬁnal result; label each vector drawn e. g. asA, 2A, C etc): a) [6 pts] C=A +B b) [6 pts] C =B —A c) [8 pts] C = 2A — 0.53 Phy211 Spring 2012 Syracuse University Exam 1 (11:00 am) Page 2 3. [20 pts] In search for food a shark swims 200 min a direction 10° north of east, then suddenly
changes direction to 20° west of south and swims 300 In. Finally it swims 50 m heading exactly west.
How far is the shark from its initial position? (cosZO°=0.9397, sin20°=0.3420, cos10°=0.9848, sin10°=0.1736) 7 a“ g
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 . 0°: 7. 0 Alfrx , 0200 cosi ‘7 AJTL : 299'$:4[0°= 3q 7
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Awful’1 Ariﬁx + Adi0+7 / Phy211 Spring 2012 Syracuse University Exam 1 (11:00 am) Page 3 4. A rollercoaster car is moving along the track shown below. Assume the rollercoaster moves without
friction and therefore moves with constant speed on horizontal section of the track, speeds up on
' downward sections and slows down on upward sections. a) [18 pts] At each point indicated on the track, circle a number next to a vector which gives the
best description of the direction of the total acceleration. Do not pick 1 or 5 unless the
acceleration in exactly tangent to the track and don’t pick 3 or 7 unless the acceleration is exactly
perpendicular to the track. If the acceleration is zero, circle the number 0. ngﬁmﬁmezm " ' b) [2pts] Considering all 6 points together, which statement about the direction of the velocity is
true (circle one): (A) The direction of velocity can only be either 1 or 5. (B) The direction of velocity can only be either 3 or 7. @l'he direction of velocity canonly be 1. (D) The direction of velocity can be either 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8. Phy211 Spring 2012 Syracuse University Exam 1 (11:00 am) Page 4 5. [20 pts] Skier in ski jump competition lifts off the ramp inclined at 10° below the horizontal direction at a speed of 28 m/s. She travels 100 m in horizontal direction before landing. What vertical distance
does she descent between the ramp at the landing? Assume g=10 m/s2
(cos 10°=0.9848, sin10°=0. 1736) X; 7: $0 + 0“): 6%
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x“; :— LI; + ‘3 25+ Z ‘3 [90 = o + 328 1 Costco ALL 1
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[0’0 [90 ‘— Aka, i$~coleo '— 2.303%“ ": 3‘62
‘4 e 5230.17393614— 53627: 53.! m / Phy211 Spring 2012 Syracuse University Exam 1 (11:00 am) Page 5 ...
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