PROBLEM 14-16 (page 186, 13th edition) PROBLEM 14-13 (page 186, 12th edition) Block B is given an initial speed down the plane. Block A moves up the plane. Both blocks eventually come to rest. The mass of A is 70 kg. The mass of B is 60 kg. The coefficient of kinetic friction between A and the inclined plane is 0.20. The coefficient of kinetic friction between B and the inclined plane is 0.05. · Determine the initial speed of B in order that A travels 2 m up the plane before coming to rest. . Determine the tension in the cord during the motion. · Show that the tension force does not contribute to the total work done on the system. A B 60° 30° PROB14_013.jpg Copyright 2010 Pearson Prentice Hall, Inc.
PROBLEM 14-16 (page 186, 13th edition) K DIAGRAMS B 08
14-16 (page 186, 13th edition) 14-13 (page 186, 12th edition) COMPLETION OF PROBLEM ¥ Data Block A: u, points up the plane m4 = 70kg A !A= 60° HA= 0.2 hM=0 A1 h42 = ! ss sin "A >A2 V 2=0 A2 Block B: u points down the plane mp = 60kg !B = 30° : B hp = ! Sp sim". B B2 hp = 0 Vp2= 0 B2 ¥ Dependent motion 2 SA = Sp + constant (page 1) !SA = SA2 " SAT = 2 m UB= 0.05 !SB = SB> " S. 'B2 B1 2 !SA = ! SB (1) (2) A1 2VA1 = VB1