1: The equation of motion of a particle in vertical SHM is given by y = (20 cm) sin[(0.25 rad/s) t]. What are the particle's (a) displacement, (b) velocity, and (c) acceleration at t = 2.0 s? Also, what is (d) the period of oscillation, and (e) the frequency?
2: Find the first four harmonics for a string that is 1.0 m long, has a linear mass density of 5.0×10-2 kg/m and is under a tension of 80 N. Find the corresponding wavelengths.