Unformatted text preview: of of speed of P.
D P, and b) determine the rate of change P.
v
rough
surfaces, m
P µk r
53.13° O
g Use the following parameters in your analysis: m = 8kg , µk = 0.2, r = 2m and v = 3m/sec. IV56 Chapter IV: Particle Kinetics Homework Problem IV.54 mework Problems Given: Concrete block A (having a weight of WA ) is attached to log B (having a weight of WB )
with the cablepulley system shown. The system is released from rest with log B resting on a rough
incline (coeﬃcient of kinetic friction µk ).
ME 274 Find: For this problem: a) determine the direction of motion for the block A (you need to justify
4
your answer with analysis), and b) determine the acceleration of block A.
rete block A (having a weight of WA) is attached to log B (having a
ht of WB) with the cablepulley
m shown. The system is released
rest with log B resting on a rough
sB
e (coefficient of kinetic friction µk). his problem,
determine the direction of motion
for the block A. You need to justify
your answer with analysis.
determine the acceleration of block
A. O B sA µk
! ide appropriateUse the following parameters to receive full creditAfor this , WB = 400lb, µk = 0.2 and θ = 36.87◦ .
free body diagrams in order in your analysis: W = 50lb
e following parameter values in your analysis: WA = 50 lb , WB = 400 lb ,
= 36.87° . Given: Block B (of mass 2m) is able to slide along a smooth horizontal surface. Block
A (of mass m) is able to slide along the rough top surface of block B, as shown
in the figure. Initially, A is traveling to the right with a speed of vA1 , and block Chapter B is Particle Kinetics Homework
IV: traveling to the left with a speed of v .
B1 IV57 Problem IV.55the velocity of block B when block A has to come rest relative to block
Find:
What is
B? Write your answer as a vector. Use the following parameters in your
Given: Block B (of mass 2m) is able to slide along a smooth horizontal surface. Block A (of mass
analysis: along kg vA1 = 26 surface of block v 1 shown in the ﬁgure.
m) is able to slidem = 25the ,rough top meters / sec andB,Bas = 10 meters / sec . Initially, A is
traveling to the right with a speed of vA1 , and block B is traveling to the left with a speed of vB 1 . HINT: Consider applying the linear impulse momentum equation to the system
Find: Determine of Avelocitytogether. B when block A has to come rest relative to block B.
made up the and B of block
A
vB 1 rough
smooth m vA1
2m B...
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 Spring '09
 Force, Friction, Mass, OC, wA

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