The Sun and stars rise in the east, and set in the west. Contrast ancient and modern explanations for this observation
What will be an ideal response?
The ancients thought there was a vast celestial sphere, spinning over our heads once a day, and that the stars, Sun, Moon, and planets are all carried along for the ride. We now recognize it is the Earth itself that rotates eastward, creating this apparent westward motion of celestial bodies.
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Describe an order-of-magnitude estimate
What will be an ideal response?
The shortest distance between two points in flat Euclidean space is a
A) straight line. B) geodesic. C) neither of these
Thomson discovered the ______________ in 1897
Fill in the blank(s) with correct word
A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts falling down
Which of the following statements about the rock's motion are true just before it hits the ground? (There could be more than one correct choice.) A) Its horizontal velocity component is zero. B) Its velocity is vertical. C) Its vertical velocity component is the same as it was just as it was launched. D) Its horizontal velocity component is the same as it was just as it was launched. E) Its speed is the same as it was just as it was launched.