PHY 121 Ch 12 Lecture

# PHY 121 Ch 12 Lecture - Lecture 21 Tuesday, April 8 1 The...

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1 Lecture 21 Tuesday, April 8

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2 The gravitational force exerted by the Earth on an object. .. A. is the object's weight. B. cancels the object’s weight. C. is inversely proportional to the object's weight. D. none of the above.
3 If the radius of the Earth was one- half of its real radius, but its mass was the same, the weight of an object near the surface of the Earth A. would be exactly the same as its weight near the surface of the "real" Earth. B. would be smaller than its weight near the surface of the "real" Earth. C. would be larger than its weight near the surface of the "real" Earth. D. cannot be compared with its weight near the surface of the "real" Earth without knowing the rotational frequency of the hypothetical smaller Earth.

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4 The accepted value of G is A. 6.67 × 10 -11 Nm 2 /kg 2 B. 6.67 × 10 11 Nm 2 /kg 2 . C. 6.67 × 10 22 Nm 2 /kg 2 . D. 6.67 × 10 -33 Nm 2 /kg 2 .
5 The density of the Earth A. is uniform throughout the earth and approximately equal to 5.5 g/cm 2 . B. increases as the radius of the Earth decreases. C. decreases as the radius of the Earth decreases. D. has a minimum at the molten outer core.

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6 Copernicus, Galileo, and the Church …I have gladly read the letter in Italian and the essay in Latin that Your Reverence has sent to me, and I thank you for both, confessing that they are filled with ingenuity and learning. But since you ask for my opinion…. First, I say that it appears to me that Your Reverence and Signor Galileo did prudently to content yourselves with speaking hypothetically and not positively, as I have always believed Copernicus did. For to say that assuming the earth moves and the sun stands still saves all the appearances better than eccentrics and epicycles is to speak well… But to wish to affirm that the sun is really fixed in the center of the heavens and that the earth is situated in the third sphere and revolves very swiftly around the sun is a very dangerous
7 Copernicus, Galileo, and the Church thing, not only by irritating all the theologians and scholastic philosophers, but also by injuring our holy faith and making the sacred scripture false… …To demonstrate that the appearances are saved by assuming the sun is in the center and the earth in the heavens is not the same thing as to demonstrate that in fact the sun is in the center and the earth in the heavens. Robert Cardinal Bellarmino to Father Paolo Antonio Foscarini, 1616

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8 Syllogisms I • If it is raining, the streets are wet. • It is raining. • Therefore the streets are wet. • If it is raining the streets are wet. • The streets are wet. • Therefore it is raining.
9 Syllogisms II • If the planetary system is heliocentric, Venus will show phases. • The system is heliocentric.

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## PHY 121 Ch 12 Lecture - Lecture 21 Tuesday, April 8 1 The...

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