Sunsets are red because a. the longest path of sunlight through the atmosphere is at sunset or sunrise. b. a lot of high-frequency light is scattered by the atmosphere. c. blue light from the sun is scattered by earth's atmosphere. d. all of the above e. none of the above

Galileo was the first to notice that the moon has craters, valleys, and mountains. how might this have changed people's perception of the moon at the time?

Aball tossed vertically upward from the ground next to a building passes the bottom of a window 1.8 s after being tossed and passes the top of the window 0.20 s later. the window is 2.0 m high from top to bottom. what was the ball's initial velocity? the unit vector j^ is directed upward. how far is the bottom of the window from the launch position? how high does the ball rise above the launch position?

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