Question

need the “exercise” answered. thanks

PRACTICE IT Use the worked example above to help you solve this problem. A block with mass m 4.30 kg and a ball with mass m2 = 7.50 kg are connected by a light string that passes over a frictionless pulley, as shown in figure (a). The coefficient of kinetic friction between the block and the surface is 0.300. (a) Find the acceleration of the two objects and the tension in the string. a= 5.16 T 34.82 m/s2 (b) Check the answer for the acceleration by using the system approach. (Use the following as necessary: m, m2, Hki and g.) EXERCISE HINTS: GETTING STARTED I M STUCK Use the values from PRACTICE IT to help you work this exercise. What if an additional mass is attached to the ball? How large must this mass be to increase the downward acceleration by 45%? Your response differs from the correct answer by more than 10%. Double check your calculations. kg Why isn't it possible to add enough mass to double the acceleration? the acceleration makes m2 negative which is impossible n a dry lake bed. Ir it's traveling at 73.0 m/s when it ing to rest? Assume the coefficient of kinetic friction bjects system em involving 00 kg and a a light shown in ween the ration of the Check the m approach. mig mi2 y applying The force in figure (b), direction r both The block m2g (a) Two objects connected by a light string that passes over a frictionless pulley. (b) Force diagrams for the objects. n, and the ball with mass m2 moves in the negative y- d law, we can develop two equations involving the unknowns part (b), treat the two masses as a single object, with the ed object's speed and the friction force on the block nternal and don't appear in the second law.

Answer 1

Mi M 23 sin equation emmohiong m+m

Sec 2

"If acceleration fntreae ל 45%than So . 482 30 + m (37482)

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