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Unformatted text preview: NIE 240 DYNAMICS MIDTERM EXAM OCTOBER 18, 2007 3 NAME :
(plume. print)
Section : Question #1 SHOW ALL WORK FOR FULL CREDIT 20 points A constant horizontal force P is applied to a 40 kg block
on an inclined surface as shown. The coefﬁcients of friction
between :he block and the surface are me = 0.4. and M, = 0.6.
Find the magnitude of the fame P applied to the block if.
starting from rest, it takes 5 seconds to [email protected] m up the
incline. P: Question #2 SHOW ALL WORK FOR. FULL annrr 25 points A conveyer belt carries small boxes and drops them
mm a collection bu). W liar conveyor Belt speeEl 15 re—
quircd to initiate slipping of the boxes when 0 =10
degrees? The static coefﬁcient of friction between the
lioxcs—and—bclt—isﬂé '0: Question #3 w snow ALL WORK FOR. FULL CREDIT 20 points Collars A and B, of the same mass, m, are moving ' toward each other with the velocities shown. Knowing _‘_’A____., $31.... that the coefﬁcient of restitution between the collars is
0 (plastic impact), express as a function of m, 9,;
v3: (a) the connnon velocity, v’, of tlzo collars afrm
impact. and (h) the. loss. in kinetic enteggx, Tin“. . £1
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9.. Question #4 M snow ALL WORK FOR. FULL CREDIT 25 points A ball of mass m 100 grams is shot from
a preloaded spring mechanism along the track
shown. The spring constant k is 500 N/m and
the initial spring preload is 100 mm. The ball
"is constﬁihed to move on Elie track Tfom point
A to point: Bi The track ends at point; B. De
! termine the maximum angle, 0",“, at. the end 0
v ’  the track such that. the bull does not touch the " vertical constraint (point C). II = 100 grams C Hint: you do not need to use projectile motion
1 equations to solve this problem. 9mm: 2 ME Z‘IO Miaﬂfem/L
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This note was uploaded on 02/07/2011 for the course ME 240 taught by Professor Zinn during the Spring '07 term at University of Wisconsin.
 Spring '07
 Zinn

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