Physics 201 Midterm Exam #3 Form X

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```					Oregon State University                           Physics 201 Midterm Exam #3                                                     Fall Term, 2009

Form X
General directions: Only one sheet of paper (8.5” x 11”—both sides), with only handwritten notes, may be used during this exam. You may use
any kind of calculator, provided that it is not part of a PDA, cell phone, palmtop or laptop—and that it is not transmitting any information wirelessly.
Physical constants and other possibly useful information are provided here. Answer Question #1 ﬁrst.

Physical constants and other possibly useful information:
2
g = 9.80 m/s

Question #1:        What is the Form designation (A, B, C, D, E, F or X) for your exam—shown at the top of this page?
Write this letter in the answer box for Question 1 on the ﬁrst answer sheet in the exam booklet.

2-16: For multiple-choice or true/false items, write the letter of the one best answer in the appropriate box on the answer sheet. For
For questions 2-
questions requiring short answers (a word or short phrase only), write those in the spaces provided. Youʼre graded on your answers only—no need
to show work. Assume 3 signiﬁcant digits and SI units in all numeric answers unless instructed otherwise.

True/False (6 points each)                                                    Short Answer (6 points each)

2. True or false? A single isolated rotating object can                       8. In any isolated interaction between two objects, A and
stop its own rotation.                                                        B, ΔPA = _______________.
P

3. True or false? The linear momentum of an object is                         9. Finish this sentence correctly: “Total linear momen-
conserved when the object moves upward (against                               tum is conserved _________________________.”
gravity).
10. Calculate the force magnitude necessary to completely
4. True or false? Impulse is a vector quantity.                                   reverse, in 0.3 seconds, the motion of a 90-kg object
initially traveling at 2.4 m/s.
5. True or false? Angular momentum is always con-
served.                                                                    11. A planeʼs propellor (radius = 2.00 m) accelerates at
a constant rate from rest to 500 rpm in 8.00 seconds.
6. True or false? A vector directed 120° above the posi-                          How far does the tip of the propellor travel in that
tive x-axis is negative.                                                       time?

7. True or false? Circular translation can be measured in                     12. Write the SI unit of moment of inertia, using only
meters.                                                                        fundamental (“base”) SI units.

13. Write the SI unit of force, using only fundamental
(“base”) SI units.

Multiple Choice (6 points each)                                 15. If a massless rod has a 1-kg mass attached 40 cm from
one end, then I about that end is _________
14. A 100-kg object moving north at 4.00 m/s collides on a
frictionless surface with a 25.0-kg object moving west                             (A)   0.400 kg·m2
at 12.00 m/s. The two objects stick together after col-                            (B)   1.60 kg·m2
liding. Their speed then is:                                                       (C)   16.0 kg·m2
(D)   None of the above.
(A)   5.00 m/s
(B)   7.21 m/s                                                           16. Choose the greatest impulse magnitude:
(C)   3.33 m/s
(D)   4.00 m/s                                                                    (A) A 200-kg buffalo slowing by 1 m/s.
(E)   None of the above                                                           (B) A 6-kg bowling ball falling 50 m (from rest).
(C) A human body (90 kg) reversing its 2 m/s speed.
17. (30 points total) This problem on last yearʼs exam was re-used this year as Problem #5 on HW5.

18. (30 points total) This problem on last yearʼs exam was re-used this year as Problem #4 on HW5.

Note: Six (6) points of Extra Credit are available—for doing all of the following legibly and correctly (no partial credit
no         credit):
PRINT
1. On the cover bubble sheet: Starting at the far left in the spaces provided, PRINT and then “bubble in” your full last name.
2. On the cover bubble sheet: After your last name, leave ONE space, then PRINT and “bubble in” the ﬁrst three letters of your
A
name
ﬁrst name.
3. On the cover bubble sheet: Write your full OSU ID number (NOT your Social Security # and bubble it in the spaces provided.
W                                  (NOT                      #)
4. On the cover bubble sheet: Sign your name in the space provided.
5. On the cover bubble sheet: In the upper left corner (to the left of “Oregon State University”), write “+6” and circle it.
cir
6. When turning in your exam, you must show your current OSU I.D. to the proctor.
X                                                                                                                                    X

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