ECE
1574 Homework Set #3
Engineering Problem Solving with C++
Due date: 2/7/10 by 11:55PM
Beware of the Super Bowl time sink on Sunday
This assignment is to be done individually
Solve problems 2, 3, 4, 5, 6, and 7 during the lab session.
Work the additional exercises later.
Potentially useful information:
The cmath library provides the function atan2( double y, double
x ), which returns the arctangent of the ratio y/x, where y is a “rise” and x is a corresponding
“run.”
The arctangent of 1.0/1.0 is 45 degrees, which in radians is π/4.
This fact implies one
good way of getting the computer to calculate the value of π.
Problem 1
Use Einstein’s massenergy equivalency to determine the energy of a mass of 5, 10, and 20
kilograms. Perform your calculations using integers and a second set of calculations using float
values. Explain why the two sets of results are different. What are the units of energy?
You lab instructor will show you how to create a global symbolic constant named
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 Spring '08
 JIMKUYPERS
 Trigonometry, cout, namespace std

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