Midterm 1 Physics 260
Andrew W. Smith
You have 1 hr 15min to complete the exam. Please
leave all answers in terms of constants when possible.
Do not open the exam until instructed to do so.
Please write your name on top of each page.
YOU MUST SHOW YOUR WO
Problem 1 — Heat engines and refrigerators
a) [4 point] You want to design an ideal Carnot heat engine that wastes only 35.0% of the
heat that goes into it. The lowest cold-reservoir temperature available to you is +15.0°C.
If 150.0 J of work is done per
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a) [4 point] A 0.025- m3 container holds ideal hydrogen (H2) gas at a pressure of 1.25
atm and a temperature of 0°C. What is the total mass of hydrogen gas in this
container? 1 atm = 101 kPa, the ideal gas constant is R = 8.3
Pgﬂern 3 — Electric forces
P Charge Q1= 4.0 nC 15 at (O, 0), charge 02 = -1. 0 n0 IS at (0.30 m, 0.0 m), and charge
Qs= 5.0 nC IS at (0, 0.40 m). (k= 9.0 X 109 N m2/C2)
a) [6 point] What are the magnitude and direction of the net electro
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Problem 2 - Waves
a) [4 point] A woman is riding a bicycle at 18.0 m/s along a straight road that runs
parallel to and right next to some railroad tracks. She hears the whistle of a train that is
behind. The frequen
a) [5 point] A monoatomic ideal gas undergoes an isothermal expansion at 300 K, as
the volume increased from 0.020 m3 to 0.040 m3. The ﬁnal pressure is 120 kPa.
Determine the number of moles of this gas and the heat transfer to
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‘ Problem 1
i) For the two charges shown on the ﬁgure
a) [3 points] Determine the electric ﬁeld (magnitude and direction) at y=+4 cm.
b) [3 points] Find a point Where the electric ﬁeld IS zero.
ii) [4 points] If a line charge
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A spherical, non-conducting shell of inner radius r1= 10 cm and outer radius r2 = 15 cm
carries a total charge Q = 15 110 distributed unifome throughout the volume of the shell.
Use Gauss’s law and
a. [2 points] Calc
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i) A +4.0 uC-point charge and a —4.0—uC point charge are placed as» shown in the ﬁgure.
a. [4 points] What is the potential difference, VA — VB, between points A and B?
r b. [2 points] What will be the work done b
Vibration, Waves, Heat, Electricity and
PHYSICS 260 is the second of a three-semester introductory, calculus-based Physics
course designed primarily for engin
PHYS320 iLab (O) Experiment 7 Instructions
Magnetic Field of a Permanent Magnet and a Solenoid
One purpose of this activity is to measure the magnitude field strength of a permanent magnet as the
distance from the magnet increases. You will use
A 100 cm3 box contains helium (He) at a pressure of 2 atm and a temperature of 100°C. It
is placed 1n thermal contact with a 200 cm3 box containing oxygen (02) at a pressure of 4.0
atm and a temperature of 400°C. 1 atm = 101 kPa,