AP Free Response Question
2010 B4
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A locomotive runs on a steam engine with a power output of 4.5 x 10
^{6}
W and an efficiency of 12 percent.
(a) Calculate the rate at which heat is being delivered to the steam engine.
(b) Calculate the magnitude of the resistive forces acting on the locomotive when it is moving with a constant speed of 7.0 m/sec.
Suppose the gas in another heat engine follows the simplified path ABCDA in the PV diagram below at a rate of 4 cycles per second.
(c) i. What does the area bounded by path ABCDA represent?
(c) ii. Calculate the power output of the engine.
(d) Indicate below all of the processes during which heat is added to the gas in the heat engine.
Topic Formulas
Description
Published Formula
1st Law of Thermodynamics
Carnot efficiency
efficiency of a heat cycle
elastic potential energy
friction
gravitational potential energy
Hooke's Law
Ideal Gas Law
internal energy of a confined gas
kinetic energy
Kinetic Theory of Gases
Newton's 2nd Law
Newton's Law of Universal Gravitation
potential energy
power
power
pressure
root-mean-square speed
specific heat of a confined gas
work
work done by a confined gas
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