- #1
John_b
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First post. You guys have really been helping me out I am trying to do a course distance learning and often the course just doesn't give you enough help and the stuff on here has been great. I have had a look at previous posts but just can't seem to get my head round this one.
The Problem:-
A mass of 0.3kg is suspended from a spring with stiffness 200Nm-1. The mass is displaced by 10mm from its equilibrium position and released, for the resulting vibration calculate:
ai) the frequency of vibration
aii) the Max velocity of the mass during vibration
aiii) the Max acceleration of the mass due to vibration
aiv) the mass required to produce double the max velocity calculated in (ii) using the same spring and initial deflection.
My attempt at a solution is as follows:-
ai) F= 1/2x(pi) x root K/m = 0.159 x root 666.667 = 4.11 Hz
aii) This is where my problems start I always calculate the average speed essentially using distance/time. can I calculate the Energy = mgh then use E = 0.5*mv^2??
aiii) Once I have calculated V I would use a=v-u/t.
aiv) I think I'm on the correct lines with this one using, F=1/2(pi) x root K/m then transpose so m is the subject. my answer for this one came out as 0.075kg
Any help would be much appreciated. Thanks guys.
John_B
The Problem:-
A mass of 0.3kg is suspended from a spring with stiffness 200Nm-1. The mass is displaced by 10mm from its equilibrium position and released, for the resulting vibration calculate:
ai) the frequency of vibration
aii) the Max velocity of the mass during vibration
aiii) the Max acceleration of the mass due to vibration
aiv) the mass required to produce double the max velocity calculated in (ii) using the same spring and initial deflection.
My attempt at a solution is as follows:-
ai) F= 1/2x(pi) x root K/m = 0.159 x root 666.667 = 4.11 Hz
aii) This is where my problems start I always calculate the average speed essentially using distance/time. can I calculate the Energy = mgh then use E = 0.5*mv^2??
aiii) Once I have calculated V I would use a=v-u/t.
aiv) I think I'm on the correct lines with this one using, F=1/2(pi) x root K/m then transpose so m is the subject. my answer for this one came out as 0.075kg
Any help would be much appreciated. Thanks guys.
John_B