Homework Answers
A) 
=2πf=2×3.14×2×1012 =1.256×1013
velocity=amplitude×
=2.2×10-11×1.256×1013=276.32 m/s
Which can be approximated as 280m/ s
B)Apply App Newton's second law,
We get 18.1+mg-72.4=ma
Ie, 9.8m-54.3=1.70 m
9.8m-1.7m=54.3
m(9.8-1.7)=54.3
Therefore,mass of box A=54.3/8.1=6.7 kg
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