Unformatted text preview: 44531 44531 Instructor: Biswas/Ihas/ Whiting
PHYSICS DEPARTMENT PHY 2053 Exam 2, 120 minutes Name (print, last ﬁrst): ‘t” mo: (lé’i‘ra. Signature: On my honor, I have neither given nor received unauthorized aid on this examination. DIRECTIONS
(1) Code your test number THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE) on your answer
sheet using lines 76—80. rite your test number down and take it with you. Code your name on your answer
sheet. Code your UFID number on your answer sheet. 2 Print your name on this sheet and sign it also.
3 You may do scratch work anywhere on this exam. 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) Fill in the circles of your intended answers completely on the answer sheet, 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.
6 Hand in the answer sheet separately, showing your UFID. Useful information: 9 = 9.80 m/s2 Neglect air resistance except when stated otherwise. All ropes, strings, and pulleys have negligible mass. 1. wo skaters on a frictionless pond push apart from one another. One skater has a mass of 80 kg and the other a mass
of 60 kg. After some time the two skaters are a distance 10 m apart. How far has the lighter skater moved from her original position? (1) 2.0 m (2) 25 m (3) 5.7 m (4) 17 m @11 m 2. A rotating wheel requires 8.00 s to rotate 28.0 revolutions. Its angular velocity at the end of the 8.00 s interval is
95.0 rad/s. What is the constant angular acceleration of the wheel? (1) 10.2 rad/s2 (2) 12.6 rad/s2 (3) 24.3 rad/s2 (4) 27.4 rad/s2 @ 18.3 rad/52 3. A 2300 kg car moving east at 10.0 m/s collides with a 3000 kg car moving north. The cars stick together and move as
a. unit after the collision, at an angle of 450° north of east and at a speed of 6.14 m/s. Find the speed of the 3000 kg car before the collision. (1) 9.20 m/s @767 m/s (3) 5.62 m/s (4) 11.5 m/s (5) 14.7 m/s 4. Cart 1 of mass m moves with a velocity of +1 m/s toward cart 2 which has a mass of 9m and is at rest. Cart 1 collides
elastically with cart 2. What is the velocity of cart 2 after the collision? (1) +0.6 m/s (2) +1 m/s (3) +0.4 m/s (4) +0.8 m/s @+0.2 m/s
5. Air track car Z of mass 1.5 kg approaches and collides with air track car R of s in
mass 2.0 kg. Car R has a spring attached to it and is initially at rest. When 4’ r, ipf 9 .
the separation between the cars has reached a minimum, which of the following 77%“ 7
is correct? Neglect friction on the air track. —> V
1 Both cars have the same momentum. EEG The kinetic energy of the system has reached a minimum. Car Z has come to rest.
Both cars have the same kinetic energy.
5 Car R is still at rest. 6. A car rounds a banked curve where the radius of curvature of the road is R, the banking angle is 0, and the coefﬁcient
of static friction is a. What is the maximum speed with which the car can round the curve if R = 140 m, 6 = 10°, and a = 0.140?
(1) 18.4 m/s (2) 20.4 m/s (3) 23.2 m/s.21.1 m/s (5) 24.8 m/s 5/ ...
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- Spring '06