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When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

What is the role of lenses in microscopy?

1)the gradual change in the length of your shadow over the course of the day is caused 2)which of the following occurs when the sun is directly above earth’s equator? 3)in the northern hemisphere, the longest day occurs on the