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Dr. Shantj
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Exam 2
1
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In the image shown the clown whose mass is 70 Kg. is pulling the massless rope down and
exerting a force of 202 N.
(a)
[5 pts.} Draw the free body diagram ofthe clown.
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[15 pts.] What is the minimum coefficient of friction between clown's shoes and the ground preventing his feet
being yanked out from under him.
Ph~'sics
20 I ()
Spring 2013
Dr. Shanti
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Exam 2
2
SHOW ALL WORK!
Two boxes are connected with the massless rope as shown below. There is no air
resistance; however the coefficients of static and kinetic friction are 0.2 and 0.1
respective ly.
5.0 kg
(a)
[6 pts.] Draw a free body diagram for each box.
(b)
[14 pts.} If the system moves, find the acceleration of each block and the tension in the rope?
Physics 2010
Spring 2013
Dr. Shanti Dccmyad
Name: _ _ _ _ _ _ _ _ _ _ _ _ _ __
Unid: _ _ _ _ _ _ _ _ _ _ _ _ _ __
Discussion TA:
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Exam 2
SHOW ALL WORK!
[20 pts.] A large plate is dropped and breaks into three pieces. The pieces fly apart parallel to the floor, with V3 = 3.5 mls. As the plate falls, its momentum has only a vertical component, and Ito componE.~ parallel to the r floor. After the collision, the component of the total momentum parallel to
,\J. thefloor must remain zero, since the net external force acting on the plate
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,. has no component parallel to the floor. Using the data shown in the drawing
-::. 0 find the magnitude of velocities of pieces 1 and 2 if m] = 1 kg and
,
m2= 0.5 kg.
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Hr. Shanti
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[20 pts.} A 0.1 O-kg rocket in a fireworks display is launched from rest and
follows an erratic flight path to reach the point P, as the figure shows.
Point P is 50 m above the starting point. In the process, 425 J of work is
done on the rocket by the nonconservative force generated by the burning
propellant. Ignoring air resistance and the mass lost due to the burning
propellant, find the speed of the rocket at the point P.
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Spring 2013
Dr. Shanti Deemyad
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SHOW ALL WORK!
[20 pts.] Motorcycle stunt drivers perfonn a feat in which they drive their
cycles around a vertical circular track, as shown in the figure. Assume the
speed of the motor cycle is £,onstan! throughout the track. What is the
minimum speed the motorcycle needs to have to remain on a frictionless track
the whole time if the total mass of the motorcycle and the cyclist is
mtot = 200 kg and r = 10 m.
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