The reason the efficiency is always less than 100% is because there is always some sort of friction in the machine.
Answer: because of friction
Nuclear power generates large amounts of power with limited production of greenhouse gases.
is the answer
M = 150 kg.
Final velocity, v = 14 m/s
Initial Velocity, u = 6 m/s
Impulse = <span> m(v - u)</span>
= 150*(14 - 6)
= 150*8 = 1200 kgm/s or 1200 Ns<span> </span>
By using Coulomb's law, we want to find the value of q₁ given that q₂ experiences no net electric force. We will find that q₁ = 8nC
<h3>Working with Coulomb's law.</h3>
Coulomb's law says that for two charges q₁ and q₂ separated by a distance r, the force that each one experiences is:

Where k is a constant
Here we can see that q₂ interacts with two charges, then the total force on q₂ will be:

And we know that it must be equal to zero, so we can write it as:

The parenthesis must be equal to zero, so we can write:

And now we can solve this for q₁ to get:

If you want to learn more about Coulomb's law, you can read:
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