1. How did Eratosthenes determine the Earth's circumference in the mid- 20th Century? * A. By observing the light rays coming from the sun B. By observing the shadow cast by the vertical sticks between Alexandria and Syene C. By working in the library of Alexandria and observing the light rays from the sun through the shadow cast by the vertical sticks D. By determining the angle difference in the shadow cast by the vertical sticks between Syene and Alexandria at noontime during summer solstice

1. How did Eratosthenes determine the Earth's circumference in the mid- 20th Century? * A. By observing the light rays coming from the sun B. By observing the shadow cast by the vertical sticks between Alexandria and Syene C. By working in the library of Alexandria and observing the light rays from the sun through the shadow cast by the vertical sticks D. By determining the angle difference in the shadow cast by the vertical sticks between Syene and Alexandria at noontime during summer solstice

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

1. How did Eratosthenes determine the Earth's circumference in the mid-
20th Century? *
A. By observing the light rays coming from the sun
B. By observing the shadow cast by the vertical sticks between Alexandria and Syene
C. By working in the library of Alexandria and observing the light rays from the sun
through the shadow cast by the vertical sticks
D. By determining the angle difference in the shadow cast by the vertical sticks
between Syene and Alexandria at noontime during summer solstice

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