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Unformatted text preview: PH 1110 A Term 2007 Exam 2 am. Name Section Number 1a. [10 pts] You have designed a special airpowered tomato launcher, for which you want to calibrate its
launch velocity for a range of air pressures. Taking the launcher to Institute Park, you angle the
launcher at 30" up from horizontal and ﬁre a tomato. It arcs beautifully through the air, reaching a
maximum height before turning down to splat everywhere. Your roommate, a civil engineer with
surveying equipment, measures the displacement ﬁom the tomato’s initial position to ﬁnal impact
with the ground to be x: = 50.0 m and yf = 0.0 m. The tomato’s initial position is denoted with a gray dot on the coordinate system below. Find the initial launch velocity (vector), vi. Ignore air resistance. «Ag Y‘ol'r’ 4A_..__.__ ( , a" z r 5 m 5 U 4 (5.0) i V” m ‘50
6 I 50 03,330 " v; @130
z: 2445'
V9 3‘ 95;? M/5 m3
\fox 2 Va (3605 V61» Vagina lb. [10 pts] What is the ﬁnal velocity (vector), vf, just before impact? _   a: arm ~ uﬁ’js .m/3
_2_ r " ' Points earned on this page:  PH 1110 C Term 2008 Exam 2. Name Section Number 2a. [10 pts] A car of mass m traveling at a known constant speed v slides on an icy patch of road (no
friction) where the road curves in a half~circle with an unknown radius R. The road is banked at a
knowu angle 6. The car slides neither up nor down the bank throughout the turn. The sketch below
on the left shows the situation. Draw on the rectangle on the right the vectors representing the forces
acting on the car (from the same perspective) and label them. N
J'
9
Side View of car on i C
a banked curve I
,M 3
2b. [10 pts] Write out Newton’s Second Law for each of the directions indicated by the coordinate
system. A
j ‘6‘. 1 T
NW6 emf) Ema"); 0
}§ "& \ :T' Y 2
Hgihg 5‘ Mal), 3 m? 20. [10 pts] Solve for the unknown radius R. drab? mo
N : .__——.
6626
of in \cloly‘x. e ‘m
l’ f“ a 3 '. ‘ Points earned on this page: PH 1110 C Term 2008 Exam 2. Name Section Number 3a. [10 pts]. Testing an idea for a new physics lab, you and your Section Instructor mount some lab
equipment on a cart and take it into an elevator. You put the force plate on the ﬂoor of the elevator, as
in the sketch on the left. The elevator accelerates upward. The rectangles in the center and on the right
represent your body and the force plate. Please draw vectors representing the forces acting on them.
Clearly label each force using the form F A on B, where “A on B” means Object A acting on Object B. F It
“ﬁg m 601‘) orcepae 3b. [10 pts] Now please draw sketches of the reaction forces to each force drawn above, also using the form FA 0,13. Alternatively, you are allowed to describe the reaction forces in complete sentences.
T Mpla‘l‘e mm 991‘») M Max:547 W PH 1110 C Term 2008 Exam 2 . Name Section Number 4. A workman pushes a IOUkg box up a 400 N
frictional 15.0° incline (p. = 0.200) with 15.0°
a force of 400 N acting parallel to the incline. p, = 0.200 4a) [10 pts] Draw a freebody diagram showing all
forces acting on the box as the workman
pushes it 3;}; the incline. 9 400 N’
M “4'
{Q “A V74 W) 4b [1 Opts] Solve for the acceleration of the box and determine whether it is speeding up or
slowing down as it moves up the incline. Tatar? Xﬁir N... mjwzg’w 4oo~mdr Mjea'mze’ ’3 “0%
.. . [5‘ we si'ntﬁ' 2' Man
an Orv/5 Q 400 “Mm “*9 .
9 Iowa 400“ mi “25.343 mg” a”: «n m/‘éz‘ z 5w e» 4e) [lOpts] The workman now brings the box to rest and walks away. Determine the
_ acceleration of the box after the workman leaves. \3 Egrémlq Mmjmlsﬁmj 31““ ('5':de
av'ﬁ . ax: «0.67L3¢:1/5°‘
m .' (wwwle " 5 ' ' ' Points earned on this page: ...
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 Spring '08
 Keil
 Force, pts, section number

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