Question

Use g = 9.8 m/s? Block A (mass 40 kg) and block B (mass 80 kg) are connected by a string of negligible mass as shown in the figure. The pulley is frictionless and has a negligible mass. If the coefficient of kinetic friction between block A and the incline is k = 0.21 and the blocks are released from rest, determine the change in the kinetic energy of block A as it moves from C to D, a distance of 20 m up the incline. 437.8 X While this problem can be solved with the content from earlier chapters, you should solve this problem with work and energy content. In order to do this, see if you can you express the work done by nonconservative forces in terms of the change in kinetic and potential energy of the two blocks. Can you find an expression for the work done by the nonconservative forces? Can you find an expression for the change in kinetic energy of the two blocks? Can you find an expression for the change in gravitational potential energy for the two blocks? Can you find a relationship between the total change in kinetic energy and the change in kinetic energy of block A? J _ 370 Additional Materials Section 7.6

Answer 1

... FBp of block A and B Mint magsino y Imagcose Domag for block A so Namag code so from newton's second law EF=ma T - M MAJCOSO maggino ma T= mBg m₂ g - MLMÄg cao - mag sino mai so out mo=Bokg, mar 40kg ekz 6.21, 9=9:8 ms"; p=34° CS Scanned with a = 12:05 misa CamScanner 1

from equation of motion . i²=42+zas - U=0 cond as 12.05 mis? S = 20m so = 482.34 so change in kinetic energy = 2 mny? - I mu? u= initial velocity & so = 3x yox (482.34): is dith g. 64x100 Joule Leseamet
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