A 20% efficient real engine is used to speed up a train from rest to 5.00 m/s. It is known that an ideal (Carnot) engine using the same cold and hot reservoirs would accelerate the same train from rest to a speed of 6.50 m/s using the same amount of fuel. The engines use air at 300 K as a cold reservoir. Find the Temperature of the steam serving as the hot reservoir.
I know the efficiency of Carnot engine is 1- (T_c/T_h) and the thermal efficiency of a heat engine is 1- (Q_c/Q_h). I'm not sure how to set this up. Can you help?© BrainMass Inc. brainmass.com March 21, 2019, 11:06 am ad1c9bdddf
Hello and thank you for posting your question to Brainmass!
See attached file for solution.
You could try solving it thinking about it the following ...
The solution includes detailed explanations and step-by-step calculations for finding the temperature of steam in a steam engine in a train.