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Section 7.9

# Section 7.9 - Section 7.9(Homework 1[SCalcCC2 7.9.02 3/3...

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1. [SCalcCC2 7.9.02.] 3/3 points Last Response | Show Details All Responses Notes A spring with a 4 kg mass has natural length 1 m and is maintained stretched to a length of 1.3 m by a force of 24.3 N. If the spring is compressed to a length of 0.8 m and then released with zero velocity, find the position of the mass at any time t . x ( t ) = -.2*cos(4.5t) -0.2*cos(4.5t) 2. [SCalcCC2 7.9.04.] 3/3 points Last Response | Show Details All Responses Notes A spring with a 3 kg has damping constant 30 and spring constant 123. (a) Find the position of the mass at time t if it starts at the equilibrium position with a velocity of 2 m/s. x ( t ) = (1/2)exp(-5t)*sin(4*t) (1/2)*exp(-5t)*sin(4t) (b) Graph the position function of the mass. 3. [SCalcCC2 7.9.06.] 3/3 points Last Response | Show Details All Responses Notes A spring with a 9 kg has spring constant 132 . Find the damping constant that would produce critical damping. 67.6

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Section 7.9 - Section 7.9(Homework 1[SCalcCC2 7.9.02 3/3...

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