Rotational Kinetic Energy: A string is wrapped tightly around a fixed frictionless pulley that has a moment of inertia of 0.0352 kg ? m2 and a radius of 12.5 cm. The string is pulled away from the pulley with a constant force of 5.00 N, causing the pulley to rotate. What is the speed of the string after it has unwound 1.25 m if the string does not slip on the pulley?
A. 2.09 m/s
B. 2.36 m/s
C. 1.18 m/s
D. 3.18 m/s
E. 4.95 m/s
Answer: B
Physics & Space Science
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