Physics

An engineer claims to have measured the characteristics of a heat engine that takes in 130J of thermal energy and produces 40J of useful work.

What is the smallest possible ratio of the temperatures (in kelvin) of the hot and cold reservoirs?

  1. 👍 0
  2. 👎 0
  3. 👁 378
asked by Mike
  1. That would be whatever carnot cycle yields an efficiency of 4/13 = 30.8%

    1 - T2/T1 = 0.308

    T2/T1 = ?

    1. 👍 0
    2. 👎 0
    posted by drwls
  2. TH/TC=(1)/(1-0.308)

    1. 👍 0
    2. 👎 0
    posted by J

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    (a)(i) A heat engine takes in 1643 J of heat and releases 752 J of work to the environment in each cycle. How much work does the heat engine do in each cycle? (ii) What is the efficiency of this engine? (b) How much work is

    asked by Linda on December 2, 2019
  2. physics

    An engine manufacturer makes the following claims: The heat input per second of the engine is 90.0 kJ at 375 K. The heat output per second is 4.0 kJ at 225 K. Do you believe these claims?

    asked by sero on May 3, 2014
  3. Physics

    You design an engine that takes in 1.5 x 10^4 J of heat at 650 K in each cycle and rejects heat at a temperature of 350 K. The engine completes 240 cycles in 1 minute. What is the theoretical maximum power output of your engine?

    asked by Brianna on July 18, 2010
  4. Physics help please!

    The engine has an efficiency e1. The engine takes input heat Qh from a hot reservoir and delivers work W1. The heat rejected by this engine is used as input heat for a second engine, which has an efficiency e2 and delivers work

    asked by Mike on April 13, 2010
  5. physics

    The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? (in oC).

    asked by Erika on November 16, 2012
  6. physics

    The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? (in oC).

    asked by chelsea on November 18, 2012
  7. physics

    The maximum possible efficiency of a heat engine which exhaust its heat at a temperature of 46.0o is 39.0 percent. What is the minimum value of the temperature at which the engine takes in heat? *I think I keep doing a step wrong

    asked by Emma on November 15, 2012
  8. physics.

    Heat engine X takes four times more energy by heat from the hot reservoir than heat engine Y. Engine X delivers two times more work, and it reject seven times more energy by heat to the cold reservoir than heat engine Y. Find the

    asked by jean on April 26, 2007
  9. physics

    A heat engine takes in 840 kJ per cycle from a heat reservoir. which is not a possible value of the engine's heat output per cycle?

    asked by ramiro on May 8, 2012
  10. Physics

    Just as no mechanical device can be 100% efficient, no heat engine can transfer 100% of its heat to a single object. Some of the heat energy must be wasted (released into the environment). We have a heat engine that produces 150 J

    asked by Jessica on December 7, 2016

More Similar Questions