Problem 3. A 127 N object vibrates with a period of 3.45 s when hanging from a spring. The acceleration of gravity is 9.81 m/s^2. What is the spring constant of the spring? Answer in N/m. Note: How would one solve this type of problem? Problem 8. A spring with a spring constant of 28.9 N/m is attached to different masses, and the system is set into motion. What is its frequendy? In Hz. Note: WHat formula do I use? Problem 13. A paino emits frequencies that range from a low of about 28 Hz to a high of about 4200 Hz. Find the maximum wavelength in air attained by this instrument when the speed of sound in air is 344m/s. In m. Note: WHat formula do I use? Problem 21. Microwaves travel at the speed of light, 3*10^8m/s. When the frequency of microwaves is 7.35*10^9 Hz, what is their wavelength? In m.