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

Question

asked Jul 28, 2019 9.7k views

2 Answers

NilColor · Answer 1 · 2019-08-02T21:24:16+0000

efficiency of the heat engine is calculated by the formula

$\eta = 1- (T_c)/(T_h)$

here we know that

T_c = cold temperature

T_h = hot temperature

now we will find the efficiency of all

1) for W

$\eta_1 = 1- (T_c)/(T_h)$

$\eta_1 = 1- (120)/(620)$

$\eta_1 = 0.806$

2) for X

$\eta_2 = 1- (T_c)/(T_h)$

$\eta_2 = 1- (100)/(840)$

$\eta_2 = 0.88$

3) For Y

$\eta_3 = 1- (T_c)/(T_h)$

$\eta_3 = 1- (300)/(900)$

$\eta_2 = 0.67$

4) for Z

$\eta_4 = 1- (T_c)/(T_h)$

$\eta_4 = 1- (25)/(500)$

$\eta_4 = 0.95$

So here most efficient engine is Z and least is Y

so we can arrange it as

Z > X > W > Y

so 3rd option is correct here