Aheat engine has a cold reservoir of 250°c and a hot reservoir of 715°c. what is the efficiency of the engine? a. 65.0% b. 60.8% c. 73.6% d. 58.6% e. 69.1%

Solution:

715 - 250 = 465

715 x 0.65 = 464.75 = 465

Final

A. 65%

which statement about this sum is true? −245+2.7

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is