Question

6000 j of energy is used as kinetic energy. 3000 j is wasted as heat and sound. 1,000 j is used as light and sound. What is the efficiency of this system?​

Answer 1

Let the efficiency of system be x,

Now acc.to question,

6000 j = 3000 j + 1000 j + x

6000 j = 4000 j + x

6000 j - 4000 j = x

2000 j = x

So, the efficiency of the system is 2000 j .