Engine 1 has an efficiency of 0.13 and requires 7200 j of input heat to perform a certain amount of work. engine 2 has an efficiency of 0.28 and performs the same amount of work. how much input heat does the second engine require?

3,342.86J

Explanation:

Engine 1

Quantity of Input Heat,  = 7200J

Efficiency,  η = 0.13

                           Efficiency,  η

                           ⇒ W = η

                                W = 0.13 × 7200

                                W = 936J  

Engine 2

Efficiency,  η = 0.28

Since Engine 2 performs same amount of work as Engine 1, then,

                 Work-done by Engine 2 = Work-done by Engine 1

                                       W₂ = W₁ = 936J

                 Efficiency,  η

                  = W / η

                  = 3,342.86J

The input heat require by  the second engine is 3,342.86J

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

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