1. Determine the value of the acceleration due to gravity on planet X if a pendulum having a length of 30.0 cm has a frequency of .70 hz on that planet? 2. Find the period of motion for a 200 gram mass vibrating on a spring having a spring constant of 4.0 n/m? 3. When a mass of 35.0 grams is attached to a certain spring, it makes 20 complete vibrations in 4.80 seconds. What is the spring constant for this spring? equations: SHM: T=2pi sqr(m/k) 1. i have no idea...really 2. t=2pi sqr(200g/4 n/m) = 44.4288 3. k=4pi^2m/t^2 k=4pi^2(35g)/(4.1s)^2 [t=4.1s] k=82.19 N/M I dont understand the spring constant equation. Please help?