I need help with these question from physics. I decided to take on an extra practice worksheet to study but I'm stuck. Please solve and explain the questions below. Everything is given in the attachments, thanks!!

A spring with a spring constant of 27 N/m is stretched 16 cm. What is the spring's potential energy? J (Round to the nearest hundredth) Question 6 Observing a guitar string, you see 5 antinodes as it resonates. How many standing waves are there? If the frequency of vibration is 1550 Hz, what is the natural frequency of the string? What is the guitar string's 4th harmonic?Question 1 If the period of a pendulum is 2.37 s and the gravitational acceleration is 9.8 m/s what is its length? s (Round answer to nearest tenth)The wavelength of water waves in a shallow dish is 6.0 cm. The water moves up and down at a rate of 4.8 oscillations/s. (Round answers to nearest hundredth) a. What is the speed of the waves? [: m/s b. What is the period of the waves? [: s