In a Problem Using Energy Considerations to Solve for the Speed

question 69

Multiple Choice

In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below,where should the potential energy have its zero value?

• A)It should be at the level from where the ball is thrown.
• B)It should be at the ground level where the ball hits.
• C)It should be slightly below ground level so the potential energy is always positive.
• D)It doesn't matter since only differences in potential energy matter in solutions.

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Definitions:

Low

Typically refers to a state or condition of minimal magnitude or intensity, such as low voltage or low frequency.

Start Winding

A winding in a motor that is used during the start-up phase to create an initial rotating magnetic field.

Split-phase Motor

A type of single-phase induction motor that uses two windings, a start and run winding, to create a phase shift for starting torque.

Stator Core

The stationary part of an electric motor or generator, consisting of laminated silicon steel, that supports the winding where the magnetic field is produced.