Little Timmy does +100 J of work while lifting a heavy box. How much gravitational potential energy (PEg) is now stored in the box? Explain

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 softest and hardest minerals are: softest hardest

How does an observation about an object differ from an inference about that object