HW1_PHY131 - 1. The metric prefixes (micro (), pico, nano,...

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1. The metric prefixes (micro ( μ ), pico, nano, …) are given for ready reference on the inside front cover of the textbook (also, Table 1–2). (a) () 6 100 y 365 day 24 h 60 min 1 century 10 century 52.6 min. 1century 1y 1day 1h §· § · § · § · == ¨¸ ¨ ¸ ¨ ¸ ¨ ¸ ©¹ © ¹ © ¹ © ¹ (b) The percent difference is therefore 52.6 min 50 min 4.9%. =
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2 . (a) In atomic mass units, the mass of one molecule is (16 + 1 + 1)u = 18 u. Using Eq. 1–9, we find () 27 26 1.6605402 10 kg 18u = 18u 3.0 10 kg. 1u §· × ¨¸ ©¹ (b) We divide the total mass by the mass of each molecule and obtain the (approximate) number of water molecules: 21 46 26 1.4 10 51 0 . 3.0 N × ≈≈ × ×
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4 . (a) Using the fact that time = distance/velocity while the velocity is constant, we find avg 73.2 m 73.2 m 3.05 m 1.22 m/s 73.2 m 73.2 m 1.74 m/s. v + == + (b) Using the fact that distance = vt while the velocity v is constant, we find v avg m / s)(60 s) m / s)(60 s) s m/s. = + = (. . 122 305 120 214 (c) The graphs are shown below (with meters and seconds understood). The first consists of two (solid) line segments, the first having a slope of 1.22 and the second having a slope of 3.05. The slope of the dashed line represents the average velocity (in both graphs). The second graph also consists of two (solid) line segments, having the same
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This note was uploaded on 04/18/2008 for the course PHYS 131 taught by Professor Reay during the Spring '08 term at Ohio State.

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HW1_PHY131 - 1. The metric prefixes (micro (), pico, nano,...

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