Question

The chart shows data for four heat engines.



Which lists the engines from most efficient to least efficient?

Y, X, W, Z
Z, W, X, Y
Z, X, W, Y
Y, W, X, Z

Answer 1

Here is it....hope i help you

Answer 2

Answer: (III).The engines from most efficient to least efficient is Z,X,W,Y.

Explanation:

Given that,

For W,

Cooling temperature $T_{c}= 120 K$

Heating temperature $T_{h}= 620 K$

For X,

Cooling temperature $T_{c}= 100 K$

Heating temperature $T_{h}= 840 K$

For Y,

Cooling temperature $T_{c}= 300 K$

Heating temperature $T_{h}= 900 K$

For Z,

Cooling temperature $T_{c}= 25 K$

Heating temperature $T_{h}= 500 K$

Using formula of efficiency

$\eta = 1-\dfrac{T_{c}}{T_{h}}$

For W,

$\eta = 1-\dfrac{120}{620}$

$\eta = 0.806$

For X,

$\eta = 1-\dfrac{100}{840}$

$\eta = 0.880$

For Y,

$\eta = 1-\dfrac{300}{900}$

$\eta = 0.666$

For W,

$\eta = 1-\dfrac{25}{500}$

$\eta = 0.95$

Hence, The engines from most efficient to least efficient is Z,X,W,Y.