Engineering Board Exam Reviewer · Engineering Mechanics · medium
Two masses, 9 kg and 5 kg, are connected by a light inextensible string over a frictionless, massless pulley (an Atwood machine). What is the magnitude of the system's acceleration? (g = 9.81 m/s2)
- 34.34
- 2.8
- 9.81
- 39.24
Answer
B. 2.8
Solution
For an Atwood machine: a = (m1 - m2)g / (m1 + m2) = (9 - 5)(9.81) / (9 + 5) = 2.8 m/s2.
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