Hold a pencil in front of your eye at a position where its blunt end just blocks out the moon. make appropriate measurements to estimate the diameter of the moon, given that the earth–moon distance is 3.8 × 105 km. assume that the pencil has a diameter of about 0.7 cm, and it just blocks out the moon if it is held about 0.75 m from the eye. express your answer using two significant figures.
Answers: 3
= diameter of moon
= diameter of pencil lead = 0.7 cm
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