What Was Eratosthenes's Mathematical Contribution to the History of Astronomy

question 53

Multiple Choice

What was Eratosthenes's mathematical contribution to the history of astronomy, even though it was incorrect?

• A) He calculated the diameter of Earth by what he learned from travelers' itineraries.
• B) He estimated Earth's revolution rate by measuring the length of shadows casted on the surface.
• C) He determined that all the planets orbited Earth every 24 hrs.
• D) He attempted to calculate Earth's radius by utilizing the position of sunlight.
• E) He believed all of nature was underlain by musical principles.

Describe the units of measurement used in specifying surface textures, including micrometers and microinches.

Recognize the terminology and abbreviations related to surface textures, including roughness average.

Comprehend the importance of specified surface textures in the design and function of mating parts.

Understand the concept of surface irregularities and their classification.

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Definitions:

Gold Stars

Symbolic markers of achievement or recognition, often used in educational settings to motivate or reward.

Reward System

A group of neural structures responsible for incentive salience (i.e., motivation and desire), associative learning (primarily positive reinforcement and classical conditioning), and positively-valenced emotions, particularly those involved in reward-associated memory.

Psychodynamic Theory

Sigmund Freud’s perspective, which emphasizes the importance of unconscious motives and conflicts as forces that determine behavior.

Conflicting Personality

A situation or condition where an individual's traits or behaviors are at odds, leading to internal tension or inconsistency.