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What is a step common to all performance improvement models?

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Match the research method with the answer that best describes it. 

The gravitational field strength at a distance R from a mass M is g. What is the field strength at a distance 2R?

A 2-kg mass on a spring (k = 50 N/m). What is the period (s)?

The motion of a particle connected to a spring is described by x = 10 sin (pt). At what time (in s) is the potential energy equal to the kinetic energy?

At sea level, at a latitude where 9=9.80 m/s2 , a pendulum that takes 2.00 s for a complete swing back and forth has a length of 0.993 m. What is the value of g in m/s2 at a location where the length of such a pendulum is 0.970 m?

Which of the following best explains why astronauts in orbit feel “weightless”?

A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33)

A long solenoid (n = 500 turns/m) carries increasing current at 3 A/s. What is induced E in a circular loop (r = 0.02 m) at center?