A simple pendulum is 1.15 meters long and has a period of 6.29 seconds. The pendulum is on an unknown planet. What is the acceleration of gravity of the Unknown Planet? (Express your answer in m/s?).

You hang different masses M from the lower end of a vertical spring and measure the period T for each value of M. You use Excel to plot T2 (in s2) on the y-axis versus M (in kg) on the x-axis. The equation for the straight line that gives the best fit to your data is y = 0.0467x + 0.00400. (a) What is the mass of the spring? I found that the force constant of the spring is 845.362 N/m and for the mass of the spring I found it to be 0.085 kg (85.65 g) but it's wrong when I submit it. Am I doing something wrong?

A new dwarf planet was observed recently in the asteroid belt between Mars and Jupiter. It has an orbital period of 7.93 E 7 s. The ratio from the law of harmonies is approximately 2.98 E−19 s2/m3. What is its average distance from the sun? 1. 2.40 E 11 m  2. 2.66 E 11 m   3. 2.77 E 11 m   4. 3.76 E 11 m

A force of 15.0 N is required to stretch a spring a distance of 5.20 cm. What is the force constant of the spring, in units of N/m?