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mrcotton
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Homework Statement
A mass spring system carries a mass of 0.4kg. When the point of suspension is made to vibrate verticaly at a frequency of 15Hz resonance occurs. What mass should be added to the 0.4kg in order to reduce the resonant frequency to 10Hz.
a) 0.20kg
b) 0.40kg
c) 0.50kg
d) 0.60kg
Homework Equations
T=2∏√(m/k)
15=2∏√(0.4/k)
The Attempt at a Solution
15=2∏√(0.4/k)
10=2∏√(0.4+x/k)
Do I rearrange these so I have all the constants on the rhs then equate the lhs and solve for x if that makes sense?
Any help appreciated