The approximate mass of mercury

Your pendulum clock which advances 1.0 s for every complete oscillation of the pendulum is running perfectly on earth at a site where the magnitude of the acceleration due to gravity is 9.80 m/s2. you send the clock to a location on the moon where the magnitude of the acceleration due to gravity is 1.65 m/s2.

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds