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Unformatted text preview: October 9, 2009. 5'01 (Jr/GUS Name (please print):
Signature: I
Student Number (optional): PHYS 1420 6.0
Test 1A 1. (6 marks) The position of a particle moving along an x axis is given by x = 3.0t 7 t2, where t is in
seconds and x is in meters. 21. Determine the instantaneous velocity at t = 1.0 s : gig :; 3.0 —.219
waft/£95): 3.D—.2(/.c>)"= 10 “4/; b. Determine the average Velocity between t = 1.0 s and t = 2.0 s. 95 X2 ~X, [3.0(_2.0) —(2012J—[3.0(/~9}'€"/.7 0": é; __é( 2"9__/.o 07:0 0. What is the maximum positive x coordinate reached by the particle? MAXIMUM K I! QE‘ACHED W554 02;; 30 "—2‘6': (.3 67/4": X= zo(r.r)— (~71: 2.21:0... 2. (6 marks) The best leaper in the animal kingdom is the puma. Imagine that the animal jumped from
the ground with the initial speed of 12 mfs at an angle of 400 and landed on a branch of a
tree 0.37 3 later. Determine the straight line distance from puma’s initial position to
where the animal landed on the branch. )M
 US {XX20,! {
aim/r2 egg/coma“ {a 37:) = 3. has A) 7 CLJ‘LL *j‘qt‘a
a
A) 3/2 @9er 90°(o.33 5) +jK—2f%7}/a 3275) AJ': 2./c€a_, [Y : Axaf’sﬁa = Uﬂ.‘ru4}2‘+(2.rd€a./a 7—34.0/«4. 3. (6 marks) Two forces are applied to a car in an effort to move it, as shown below. If the car has a
mass of 2500.0 kg, what acceleration (magnitude and direction) does it have? Ignore
friction. '2 .57:ng
E ‘5 5,, TE”: £10051) 5M3‘96féff‘3pjstutoa': {2‘ 7'0 1E7 f :(‘tuopj axsou+ @5910) agar/o“: .7119? {p F: W: WW) 1+(W’2M12' F: 795%)
._ F_ 7Wru _ A
a“?«— grocky— 0.3.2 “*0 D : afc‘i‘row Z/aaoé 1'" [Lurk Zﬁfé‘c?‘ 7° K'AK'S) 4. (6 marks) Two blocks are connected by alight rope over a frictionless pulley, as shown below. The
coefﬁcient of kinetic friction between the 7.00 kg mass and the incline plane is 0.250. 21. Draw a freebody force diagram for each block. "‘3 b. Detennine the kinetic force of friction acting on the 7.00 kg block. {if/“UV =/<u m3 conﬁne“ =‘ g
:(Q'Z’QKQUow/W’ﬂﬂw: 39.0 7C2." /3?)U' c. Use Newton’s second law and write two equations, which would allow you to
determine the accolcratic'nn of the system of two blocks and the tension in the rope.
It is NOT necessary to solve these two equations. “A M
T—— ‘(Ajgl'H 340*74‘2 “40 T— (7.uo)(?.4ﬂ~rL 311 rs} = 2. a a. T42 raj/93): zzoa. 5. (8 marks)
Answer the following multiplechoice questions. a. A ball is thrown straight up in the air. For which situation are both the instantaneous
velocity and the acceleration zero? 1. on the way up 2. on the top of the ﬂight path 3. on the way down 4. halfway up and halfway down
G none of these. b. If Earth’s mass and radius both suddenly doubled, your weight would 1. increase 4 times
2. increase 6 times
3. increase 8 times
decrease 2 times
. decrease 4 times. c. How long will it take the hemoglobin molecule to diffuse an rms distance of 0.001 mm along the x direction in water? Diffusion coefﬁcient for hemoglobin in water is
D = 6.9x10'“ mZ/s. 1.0.75 . XMAS 7‘ i 2 bf
2.0.075 2 06 )2
.0073 :M _. L 0.0007 s 2 D 5” 51
5. 0.0000075  Z a?“ 5
f 2 Q C30 3; d. The velocity versus time graph for an object moving along a straight path is shown
below. The average acceleration of the object during the time interval 3.0 s to 17 .0 s is 1. 0
2. 0.88 m2 (91.1 m/s2 4. 1.6 m/s2
5. 0.63 ran/s2 ...
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This note was uploaded on 06/14/2010 for the course PHYS 1410 taught by Professor Wijngaarden during the Spring '09 term at York University.
 Spring '09
 WIJNGAARDEN
 Physics

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