Multiple Choice
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? 
A) 18 g
B) 30 g
C) 36 g
D) 60 g
E) 90 g
Correct Answer:
Verified
Correct Answer:
Verified
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