Acarnot engine has a power output of 150 kw. the engine operates between two reservoirs at 20.0°c and 500°
c. (
a. how much energy does it take in per hour

8.8 × 10³³J

Explanation:

efficiency of an engine η  = net work output ÷ heat input = 1 -

= 500 + 273 =773K

= 20 + 273 =293K

= 1 -

  =0.62

power output= work output = 150kW

power output per hour = 150 × 1000×3600

                                     =5.4×10⁸J

recall, net work output ÷ heat input = 1 -

∴ 0.62= 5.4×10⁸ ÷ heat input

heat input= 5.4×10⁸÷0.62

=8.81×10⁸J

we need some answer choices, or something like that

explanation:

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27