Unformatted text preview: 77777 The first answer is the correct one for this format. Solutions are given at the end of the ﬁle 77777 / Instructor(s): Ihas/Biswas
PHY 2053 Exam 1 Sept. 25, 2006 Name (print, last ﬁrst): Signature: ()n my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your answer sheet (use lines 76—80 on the answer sheet for the 5-digit
number). Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY. Code your UFID
number on your answer sheet. 2 Print your name on this sheet and sign it also. 3 Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of
the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink. Do not
make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. If you believe that no
listed answer is correct, leave the form blank. (6) Hand in the answer sheet separately. Useful information:
g = 9.80 m/s2 Neglect air resistance. Ropes and pulleys are massless. 1. When three vectors are added graphically they form a closed triangle. The largest enclosed angle between any two of
the vectors cannot be greater than: (1) 180°. (X) 90°. (it) 60°. (4) No maximum exists. (R459 2. An airplane of mass 1.2 X llllkg tows a glider of mass 0.6 X 10"kg. The airplane propellers provide a net forward thrust
of 3.6 X 104N. What is the glider’s acceleration? @211 Iii/s2 (2) 3.0 m/s2 (3) 6.0 III/s2 (4) 9.8 m/s2 (5) 1.0 III/S2 3. An elevator weighing 20,000 N is supported by a masslcss cable. What is the tension in the cable when the elevator is
being accelerated upward at a rate of 3.00 Ill/S2? (1) 6,100 N (2) 25,000 N (3) 20,000 N (4) 25,600 N (5) 30,100 N 4. A 5,000N weight is held suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the
Object and has a tension, T1. Cable 2 applies a force upward and to the left at an angle of 370° to the negative .L' axis
and has a tension, T2. What is the tension, T1? @0540 N (2) 4,000 N (3) 3,310 N (4) 3,340 N (5) 19,600 N 5. A runner circles a track of radius 100 In one time in 100 s at a constant speed. Her velocity has changed the greatest
from her initial velocity: ' 1 when she is one—half of the way around the track.
) when she is one-fourth of the way around the track.
3 when she is three-fourths of the way around the track.
4 when she has circled the track once.
5 Her velocity never changes ‘61 The following force vectors act on an object: 1) 50.0 newtons at 450° north of east and ii) 250 newtons at 300°
south of east. Which of the following represents the magnitude of the resultant and its angle relative to the easterly direction? 61.4 newtons, 219° (2) 75.0 newtons, 7.50” (3) 23.4 newtons, 18.3" (4) 12.8 newtons, 376° (5) 61.4 newtons,
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- Spring '06