UNIVERSITY OF MASSACHUSETTS DARTMOUTH
COLLEGE OF ENGINEERING
EGR 101 INTRODUCTION TO ENGINEERING THROUGH APPLIED
SCIENCE I
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This assignment is due Thursday, September 26, 2013.
Use engineering papers.
Show all of your steps.
Present your work neatly and clearly.
Box your final answers.
Problem 1
Problem #3 on page 73 of the textbook.
Problem 2
Problem #6 on page 73 of the textbook.
Problem 3
Problem #7, parts a, d, e, f.
Problem 4
Consider e-t/RC, where R is resistance in Ohms, C is capacitance in Farads, and t
is time in s
a) What are the units associated with the product R*C
b) Look up the definition of Farad. Determine how you could get the units from
part a) using R*C. Hint: you may have to use Ohm's law to find a suitable form
for the resistance.
c) If R = 1 MΩ and C = 1 µF , use excel to plot e-t/RC , for the interval 0 ≤ t ≤
10 sec
Problem 5
Find the % increase or decrease in resistance of a wire whose diameter is halved
Find the ratio of the resistance of copper to that of aluminum for two wires of the
same length and diameter.
Find the diameter of a copper wire that has the same length and resistance of an
aluminum wire. The aluminum wire has a diameter of 0.1 mm.