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College Physics 1
Problem 11PE Show that if two resistors R1 and R2 are combined and one is much greater than the other ( R1>>R2 ): (a) Their series resistance is very nearly equal to the greater resistance R1 . (b) Their parallel resistance is very nearly equal to smaller resistance R2 .

Classical Mechanics 0
The maximum displacement of a mass oscillating about its equilibrium position is 0.2 m, and its maximum speed is 1.2 m/s. What is the period r of its oscillations?

Probability and Statistics for Engineering and the Sciences 9
Problem 32E Fire load (MJ/m2)is the heat energy that could be released per square meter of floor area by combustion of contents and the structure itself. The article Fire Loads in Office Buildings (J. of Structural Engr., 1997: 365368) gave the following cumulative percentages (read from a graph) f

Elementary Principles of Chemical Processes 3
Five percent excess air is used in burning the reformer fuel; it is drawn into the system at 30C and 70% relative humidity. Estimate the average molecular weight of the air. Why does it differ from the value of 29 determined in Example 3.3-4 even though the ratio of nitrogen to oxygen is the same? De

Campbell Biology 9
Which of the following processes includes all others? a. osmosis b. diffusion of a solute across a membrane c. facilitated diffusion d. passive transport e. transport of an ion down its electrochemical gradient

Introduction to Probability 1
Let X1, X2,... be the annual rainfalls in Boston (measured in inches) in the years 2101, 2102, . . . , respectively. Assume that annual rainfalls are i.i.d. draws from a continuous distribution. A rainfall value is a record high if it is greater than those in all previous years (starting with 2101),

Mathematical Statistics with Applications 7
Let Y1, Y2, Y3,... Yn be independent standard normal random variables. a What is the distribution of n i=1 Y 2 i ? b Let Wn = 1 n n i=1 Y 2 i . Does Wn converge in probability to some constant? If so, what is the value of the constant?

Plant Systematics 3
What is the difference between a bract and a scale?