Certified Safety Professional Practice Exam

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What is the standard gravitational acceleration on the Earth's surface used for calculating weight?

8.34 m/s²

9.8 m/s²

The standard gravitational acceleration on the Earth's surface is commonly approximated as 9.81 m/s², which is the value recognized in most scientific contexts for calculating weight. This figure represents the acceleration that an object experiences due to Earth's gravity when it is in free fall. Although the commonly used rounded figure is 10.0 m/s² for simplicity in some educational settings, it is less precise.

The value of 9.8 m/s² is derived from measurements that consider variations in Earth's gravity based on altitude and geographical location, but for general calculations, 9.81 m/s² is the most accurate and widely accepted figure to use in physics and engineering calculations when determining weight. Recognizing this helps in understanding the impacts of gravity on mass and weight, and is critical for accurate measurements in safety calculations, where precision is essential.

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10.0 m/s²

9.81 m/s²

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