Rework Example 7.1, now taking the zero of potential energy at street level. EXAMPLE 7.1 Gravitational Potential Energy: Riding the Elevator A 55-kg engineer leaves her office on the 33rd floor of a skyscraper and takes an elevator up to the 59th floor. Later she descends to street level. If the engineer chooses the zero of potential energy at her office and if the distance from one floor to the next is 3.5 m. what’s the potential energy when the engineer is (a) in her office, (b) on the 59th floor, and (c) at street level?
Rework Example 7.1, now taking the zero of potential energy at street level. EXAMPLE 7.1 Gravitational Potential Energy: Riding the Elevator A 55-kg engineer leaves her office on the 33rd floor of a skyscraper and takes an elevator up to the 59th floor. Later she descends to street level. If the engineer chooses the zero of potential energy at her office and if the distance from one floor to the next is 3.5 m. what’s the potential energy when the engineer is (a) in her office, (b) on the 59th floor, and (c) at street level?
Rework Example 7.1, now taking the zero of potential energy at street level.
EXAMPLE 7.1 Gravitational Potential Energy: Riding the Elevator
A 55-kg engineer leaves her office on the 33rd floor of a skyscraper and takes an elevator up to the 59th floor. Later she descends to street level. If the engineer chooses the zero of potential energy at her office and if the distance from one floor to the next is 3.5 m. what’s the potential energy when the engineer is (a) in her office, (b) on the 59th floor, and (c) at street level?
At point A, 3.20 m from a small source of sound that is emitting uniformly in all directions, the intensity level is 58.0 dB. What is the intensity of the sound at A? How far from the source must you go so that the intensity is one-fourth of what it was at A? How far must you go so that the sound level is one-fourth of what it was at A?
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