A mobile is shown in the figure.The horizontal supports have negligible mass.Assume that all the numbers given in the figure are accurate to two significant figures.What mass M is required to balance the mobile? 
Definitions:
Emotional Dissonance
A conflict or incongruence between felt emotions and the emotions that are expressed or expected to be expressed in a social context.
Emotional Empathy
The capacity to recognize and, to some extent, share feelings that are being experienced by another sentient being.
Emotional Intelligence
The ability to understand, use, and manage one's own emotions in positive ways to relieve stress, communicate effectively, empathize with others, overcome challenges, and defuse conflict.
Cognitive Empathy
The capacity to understand another person's perspective or mental state without necessarily sharing their emotions.
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