A resting 14.0-kg electromagnet pole is positioned at the bottom of the slide, hanging vertically 5.4 m from a stationary and frictionless axle. As the metal box reaches the bottom, it activates the electromagnet and got pulled and attached to one end of the electromagnetic pole, and swings through an angle of 68°.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter24: Electromagnetic Waves
Section: Chapter Questions
Problem 1P
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From vertical height H, a metal box slides down a roller slide without any friction. A resting 14.0-kg electromagnet pole is positioned at the bottom of the slide, hanging vertically 5.4 m from a stationary and frictionless axle. As the metal box reaches the bottom, it activates the electromagnet and got pulled and attached to one end of the electromagnetic pole, and swings through an angle of 68°. The electromagnetic pole is then deactivated and the metal box is detached. The mass of the metal box is 35.0 kg and can be treated as a point mass. Solve for height h. 

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