Question

Exercise 9.47 - Enhanced - with Solution A pulley on a frictionless axde has the shape of a uniform solid disk of mass 2.90 kg and radius 200 cm A 1.10 kg stone is attached to a very light wire that is wrapped around the rim of the pulley (Figure 1), and the system is released from rest For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of An unwinding cable Part A How far must the stone fall so that the pulley has 3.50 J of kinetic energy Express your answer with the appropriate units Figure HA ? 1 of 1 h = 10.7 m pulley Submit Previous Answers Request Answer X Incorrect; Try Again; One attempt remaining

Answer 1

that A] Given W? - 3.50 ) - Rele á lämaiwa) = à mu? = 3.50 4x 3.50 8.90 v² m/ = 4. 4.8275 (AK)mass + (AK)pulley + cou) mass 3.50 - mgh = 0 mu+ 3.50 - mgh = mu?+ 3.50 á xe.de E -loo X1.10 * 4.8275 + 3.50 mgh = - 6.155 J ha = 0.5703 6.!55 1.10x 9.81 h = 0.5703m 3,50 3 ke Akrotal = 3.50 + á x 1.10X4,8275 3.50 ke Kest = = 0.56 86 XIDO 6.155 ke Kest = 56.86%