<h2>A practical machine cannot be 100% efficient? </h2>
- IF THE CHOICES ARE TRUE OR FALSE THEN U GO
- The answer is false a machine cannot be 100 percent efficient because the output of a machine is always less than input. (correct me if I’m wrong)
<h2>
Have a great day<3</h2>
Answer:
плщщащмапромплщкутчрралагыд
Answer:

Explanation:
Here as we know that total angular momentum is always conserved for child + round system
so here by angular momentum conservation we have

here we have
(inertia of boy)


now we have




the answer is B.) Mass of material.
Answer:
The formula for Impedance for circuit with R, C, and L are:

The impedance Z of the series RLC circuit depend upon angular frequency ω. Impedance is measured in ohms and resistance (R), inductance reactance and capacitive reactance. Series RLC circuit consist of the resistance, a capacitance and an inductance connected in the circuits. Electrical impedance is the measurement of the opposition that a circuit present in a current.