A magnifying glass has a convex lens of focal length 15 cm. At what distance from a postage stamp should you hold this lens to get a magnification of +2.0?
7.5 cm
Physics & Space Science
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Answer the following statement true (T) or false (F)
Physics & Space Science
The average speeds v and molecular diameters d of five ideal gases are given below. The number of molecules per unit volume is the same for all of them. For which is the collision rate the greatest?
A. v = v0 and d = d0 B. v = 2v0 and d = d0/2 C. v = 3v0 and d = d0 D. v = v0 and d = 2d0 E. v = 4v0 and d = d0/2
Physics & Space Science
By what factor must one change the weight suspended vertically from a spring coil in order to double its period of simple harmonic motion?
a. 4 c. 1/2 b. 2 d. 1/4
Physics & Space Science
What causes this disk to form and flatten?
Choose one: A. angular momentum B. linear momentum
Physics & Space Science