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Unformatted text preview: Physics 1D03
Sununer2009 TEST 1 May 25, 2009 Instructor: Dr. A. J opko Name: S W Duration: 80 minutes
' Student Number: Signature : Instructions:
0 Print your name and student number in the spaces above and then sign your name.
In Part A, circle the letter beside the answer of your choice.
In Part B, provide complete solutions in the space below each question.
Do not use pencils.
You may use the formula page provided but no other notes or text.
Only the McMaster standard calculator is allowed. There are 9 multiplechoice questions in part A and 4 longanswer questions in
part B. Page 2 of 8 PART A Circle the letter beside the correct answer for each question. Each correct answer
is worth 2 marks. An incorrect answer or unanswered question is worth zero
marks. 1) A person holds a book in their hand by exerting an upward force on the book. Let this be the action
force. The reaction force is: A) The downward force of gravity on the book.
B) The upward force of gravity of the book on the earth.
C) The dovmward force of the book on the ﬂoor. The downward force of the book on the hand. 2) Suppose you are standing inside a moving bus. Suddenly the driver of the bus brakes to avoid an
accident. You will be propelled forward because: A) The bus exerts a forward force on you. 13) The normal force of the bus on you has a forward component.
© Your inertia wants to remain the same. D) You exert a backward force on the bus. 3) A particle moves at a constant speed v=4.0 mfs for 3.0 seconds and then remains at rest for another
2.0 seconds. Over the 5.0 seconds, the particle’s average speed, in mfs, is: A)4 ® 2.4 C) 2
D) 0.8 Continued next page Page 3 of 8 4) The velocity Vector of a boat relative to the water is given by (4, 2) mfs while the velocity of the
boat relative to the ground is given by (3, 3) m/s. Then the velocity of the water relative to the ground,
in m/ S, is given by: B) (1, 5)
C) (5, 7)
D) (—5, 7) 5) The driver of a speeding truck slams on the brakes and skids to a stop in a distance d meters. If the
mass of the truck were doubled then the distance the truck skids would be: ® d
B) More than d.
C) Less than d. D) Impossible to determine with the information given. 6) A wheel rotates counterclockwise in the x—y plane when viewed from the positive 2 axis. If the
wheel starts to slow down then: A) The angular velocity vector points in the positive 2 direction while the angular acceleration vector
points in the positive 2 direction. i B) The angular velocity vector points in the positive 2 direction while the angular aCCeleration vector
points in the negative 2 direction. C) The angular velocity vector points in the negative 2 direction while the angular acceleration vector
points in the positive 2 direction. D) The angular velocity vector points in the negative 2 direction while the angular acceleration vector
points in the negative 2 direction. Continued next page Page 4 of 8 7) Fictitious forces arise in a reference frame because the frame is: A) Moving with constant velocity.
.Not an inertial reference frame. C) At rest.
D) All of the above. 8) An object, released from rest at 1:0, falls under gravity a distance d in a time of t seconds. If it
continues to fall for a further time of t seconds (for a total time of 2t) then the total distance it has fallen since it was released is: A) d
B) 2d
C) 3d [email protected] 4d 9) An applied external force creates a torque on an object with respect to a given point. If the force
vector is moved to another point on the same line of action then the torque: A) Will increase. .Stays the same. C) Will decrease. D) Depends on which way the force vector is moved along the line of action. Continued next page Page 5 of 8 PART B Write a clear solution showing how the answer is obtained. Each problem correctly
answered is worth 3 marks. 10) A 120.0 kg Chesterﬁeld is pushed up a frictionless ramp at a constant acceleration of 1.5 m/s2 by a delivery person.
a) If the ramp is inclined at 9:30.00 to the horizontal, what horizontal force F must the delivery person apply to the Chesterﬁeld? (Draw an appropriate freebody diagram and suitable axes) +1, U030“ 'LW3,M%O
F : WM" (9
(887.8628) [k b) If the ramp is 10.0 meters long and the Chesterﬁeld starts from rest at the bottom of the ramp, ﬁnd
the speed of the Chesterﬁeld at the top of the ramp. V: (BL 61 (10) = 30 Continued next page Page 6 of 8 11) A 1.5 kg block is at rest on a horizontal ﬂoor. The coefﬁcients of static and kinetic friction
between the block and the ﬂoor are both 0.33. You pull on the block with a force F= 4 newtons at an
angle of 20° above the horizontal. Draw a freebody diagram for the block. a) Find the force of friction of the ﬂoor on the block? F=4N b) Does the block accelerate or remain at rest? Explain. Continued next page Page 7 of 8 12) A 0.40 kg object is swung in a vertical circular path by a string of length 0.80 In. a) If the object’s speed is 8.5 mfs at the top of the path, what is its centripetal acceleration there? L
001'”: :l $13)
K o 7?? LqOWg @ b) What is the tension in the string? c) What is the tangential acceleration of the object there? GEE—JO Continued next page Page 8 of 8 13) A mass, attached to a 50.0 cm long string, starts with an initial angular velocity of 0.50 revls and
undergoes a constant angular acceleration around a circular path for 30 revolutions in a time of 25.0 s. a) Determine the angular acceleration of the mass, in rev/32. @Cgﬁmwjdz
gal Dem+3 <>< (”3 0L ,—_ 0.0Sb/ULW/glﬁ b) Determine the final angular velocity of the mass, in rev/s. (Ale 3 wo+°L—b ,3 0/1}— omS‘é; (SLY) END ...
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 Spring '08
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