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Physics 1Al Quiz #5. 11 am class Before starting to answer questions bubble in your student ID# and test version number (A,B,C, or D on the bottom of
this quiz page on your scantron form. If you do not bubble in this info your quiz will not be graded. For numeric answers two significant digits is enough. More digits is also ok. A small range of answers near the correct
answer will be accepted. Use scientific notation (with "E" to indicate a power of ten) when needed. Note, however, that 3.1E—2 and 0.031 will be accepted as the same answer. Mark a minus sign when needed to indicate a negative value. DO NOT TO FORGET TO MARK (decimal points) and "E" (when using scientific notation) on scantrons
MARK ONLY ONE ANSWER FOR EACH MULTIPLE CHOICE QUESTlON Name Turn in this test form with your scantron form and also have your ID card out and ready to be checked.
Using notes or books, or calculators which store notes or formulas is not allowed.
Talking or looking at other students' tests is not allowed. 1) Which of the following four statements is true i) A) The rate of change of the total momenum of a system of objects is equal to the sum of all thc
external forces acting on the objects B) lf there are three objects in a system there are nine different possible contact forces C) Kinetic energy is conserved in an inelastic collision D) If 10 pool balls on a pool table are considered to be a system of Objects then sliding friction
with the table is an internal force E) All of the above statements are true 2) Which of the following four statements is NOT true? 2)
A) The rotational equation of motion is 1::lot, where r:torque and Citangular acceleration
B) Angular momentum is given by L=l(o, where lzmoment of inertia, and w=angular velocity
C) If an object is spinning it will remain spinning at the same angular velocity unless a torque or
force is acting on it
D) Angular velocity in MKS units is in rotations/s 13) All of the above statements are true 3) A pool ball with velocity 2 m/s collides with a second pool ball of equal mass initially at 3)
rest. After the collision the first ball moves off at 1 m/s at an angle of 45 degrees from the
ix axis and the second ball moves off at an angle of 315 degrees from the +x axis. What is
the velocity of the second ball in m/ s after the collision? Express your answer as a positive
number. 4) An object of 1 kg mass makes an elastic collision with another object at rest and Continue: 4)
to move in the original direction but with one—half of its original speed. What is the mass of the struck object in kg? Assume no external forces are influencing the motion of the two
balls. 5) A centrifuge is spinning a rotor carrying blood tubes at 10,000 RPM. The moment of inertia 5)
of the rotor alone is 12100 in MKS units and 40 grams of blood are spinning at a radius of
about 10 cm. If all of the blood leaked out of the tubes, and no external forces or torques
were acting, what would be the final angular velocity of the rotor in RPM? D—l 6) Which of the following four statements is true 6)
A) A 2 kg object moving at 1 m/ s has higher momentum than a 1 kg object moving at 2 m/ s _>
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B) Newton's second law states that Fzm‘Z—:l+v% C) Momentum equals mass times rate of change of velocity
D) The momentum vector points the same direction as the acceleration vector E) All of the above statements a re true 7) Suppose a torque spring generates torque r=—C93, with C21 in MKS units If a cylinder is 7)
attached to the spring and is initially rotated to 6:+0.'l radians, What is the Change in
angular momentum of the cylinder after a short time step of 0.01 seconds? Express your
answer in MKS units and include a sign to indicate direction of the Change. 8) A ball of mass 1 kg travelling in the +x direction at 1 In / s has an elastic collision with a 8)
second ball of mass 2 kg travelling at —2 m/ s ('m the —x direction). What is the velocity of
the first ball in m/ s after the collision? Include the sign to specify the direction of the
motion. 9) Please re—enter your ID number as the answer to this question and doublecheck that you 9)
marked it correctly and the same in the ID entry boxes at the top left corner of your
scantron form. Also check that you entered your test version letter. 10) A clay ball of 10 g moving in the +x direction at 1 m/s collides with a clay ball of 10 g 10)
moving at —1 m/ s in the x direction. if the collision is inelastic, what is the final velocity
of the motion in m/s? D—2 0a / 5 S" ya» 5 Mn/ ﬂ Sci/aways
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 Fall '10
 Smith

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