Item74pointseBookPrintReferencesCheck my workCheck My Work button is now disabledItem 7A 4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. If the initial velocity is 12.0 cm/s and the initial displacement is 4.00 cm, then what is the maximum velocity of the mass?
Question
Item74pointseBookPrintReferencesCheck my workCheck My Work button is now disabledItem 7A 4.00 kg mass is connected to a spring with a spring constant of 9.00 N/m. If the initial velocity is 12.0 cm/s and the initial displacement is 4.00 cm, then what is the maximum velocity of the mass?
Solution
The maximum velocity of the mass can be found using the conservation of energy principle. The total energy in a simple harmonic motion is constant and is the sum of kinetic and potential energy.
The total energy E is given by:
E = 1/2 * k * A^2
where k is the spring constant and A is the amplitude of the motion.
Given that k = 9.00 N/m and the initial displacement A = 4.00 cm = 0.04 m, we can substitute these values into the equation to find E:
E = 1/2 * 9.00 N/m * (0.04 m)^2 = 0.0072 J
At the point of maximum velocity, all the energy is kinetic energy, which is given by:
E = 1/2 * m * v_max^2
where m is the mass and v_max is the maximum velocity. We can rearrange this equation to solve for v_max:
v_max = sqrt((2 * E) / m)
Substituting the given mass m = 4.00 kg and the calculated total energy E = 0.0072 J, we find:
v_max = sqrt((2 * 0.0072 J) / 4.00 kg) = 0.03 m/s
So, the maximum velocity of the mass is 0.03 m/s.
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