What is the efficiency of an engine that does 576 j of work and exhausts 144 j of heat while taking in 720 j of heat?

a. 80%
b. 10%
c. 25%
d. 20%

The efficiency of an engine is 80%.

(A) is correct option.

Explanation:

Given that,

Work done = 576 J

Supplied heat = 720 J

Exhausts of heat = 144 J

We need to calculate the efficiency

Using formula of efficiency

Where, Q₁ = Supplied heat

Q₂ =  Exhausts of heat

Put the value into the formula

Hence, The efficiency of an engine is 80%.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.