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Question: need help vibration...

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Need help... Vibration
QUESTION 4 (10 Marks The amplitude and phase angle due to original unbalance in a grinding wheel operating at 1 200 rev/min are found to be 0.2 mm and 40° counterclockwise from the phase mark. When a trial mass of M -0.2 kg is added at 65 clockwise from the phase mark and at a radial distance 65 mm from the center of rotation, the amplitude and phase angle are observed to be 0.5 mm and 150° counterclockwise. Calculate the magnitude and angular position of the balancing mass if it is to be located 65 mm radially from the center of rotation.
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