Suppose that an ancient race of Martians realized their planet was round and wished to measure its radius. They measured the angles of the shadows cast by the Sun on the solstice at midday in two cities due North-South of each other. The Sun was directly overhead (zero shadow) in Marvinville, while the Sun cast a shadow in Green City with angle equal to 0.07 fraction of a circle (in human units, the shadow was 0.07*360 degrees). Defining the distance between Marvinville and Green City to be 1 Martian league, what radius would the Martians have measyred for their planet? Answer to the nearest hundredth: Martian leagues Rank the evidence for a round (spherical) Earth.
A. analogy to other planets, which are all round
B. circumnavigation of the globe by flying over both poles
C. cycle of day and night
D. curved shadow of the Earth on the Moon select select 1. strongest -- directly falsifies flat Earth model 2. strong B. not decisive by itself (strong if combined with the fact that the angular 4. weak (philosophical preference rather than scientific proof) select select
Answers: 2
Physics, 21.06.2019 18:00, justhereforanswers13
According to the law of conservation of mass, in a chemical reaction the total starting mass of all the reactants equal the total final mass of all the products. true or false?
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Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential
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Physics, 22.06.2019 11:40, johanperezpere51
Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?
Answers: 3
Suppose that an ancient race of Martians realized their planet was round and wished to measure its r...
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