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Last First Section Number (e. g. M014) SUlD Physics 211, Spring 2011 Exam 1 (9:30am 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. 1. A high speed train is speeding up along a straight section of the railroad from 200 km/h to 300 km/h
over a distance of 30km in 8 minutes. a) [10 pts] What is the average velocity of the train in this time interval? Express your result in 433:~ 301cm 60M_ 5,:
63H: At, '14 ﬂ \fL / b) [10 pts] What is the average acceleration of the train in this time interval? Express your result in
km/hz. AJ 3'00 (a; " «299 (4E 60% Obed't: A? Z) M ' HA 2750 l???“ / Phy211 Spring 2012 Syracuse University Exam 1 (9:30 am) Page 1 ./ mWaR “(3mg 2. Vectors A and B are shown below.
\ B 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. as A, 2A, C etc): a) [6pts] C=A+B m cubism“ a» imam b) [6 pts] C=B—A c) [8 pts] C = 2A — 0.53 A
A
C
“(9.5 E ~15 Phy211 Spring 2012 Syracuse University Exam 1 (9:30 am) Page 2 3. [20 pts] In search for food a shark swims 200 m in a direction 20° east of north, then suddenly changes direction to 10° west of south and swims 400 111. Finally it swims 50 m heading exactly east.
How far is the shark from its initial position? (00320°=0.9397, sin20°=0.3420, cole°=0.9848, sin10°=0.1736) 7N AM; a O \f 25m» 6?.Q+SO= 413
Mwhv: AVm 4‘ 4%“ d 3" M + MW N37 = 1257,?» 8%.?2 ~ZOG 2 AV“ ‘2 2 :— '7 W
o + +o+
X 7 m3/ Phy211 Spring 2012 Syracuse University Exam 1 (9:30 am) 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. 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. @The direction of velocity can only 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 (9:30 am) Page 4 5. [20 pts] A rock is tumbling down a steep mountain slope of 30°. It has a velocity of 15 m/s when it
reaches a cliff and becomes airborne. There is a vertical wall at a distance of 30 min the horizontal
direction from the edge of the cliff. At what height below the cliff does the rock strike the wall?
Assume g=10 m/sz. (cos30°=0.8660, sin30°=0.5000) V?
\ 30 z 0 + [S'COSBOO'Oi— 2
“MI: 0 __ \5.5:m300vA‘6‘ ’ilOo’b‘ 30 _ 2 a
A‘t' 7— .605300 5 " .3 up. + «to/W Phy211 Spring 2012 Syracuse University Exam 1 (9:30 am) Page 5 ...
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 Acceleration, Velocity, 4%, 7 W, 3mg

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