Force = mass times acceleration
F = 21000 x 36.9 = 774900
Therefore, 774900N force is required.
Displacement is the distance and direction from the start point to the end point. Our runner finished exactly where he started. His displacement is zero.
I would pick the only one that makes sense, D. optic fibers
Brainliest please
Explanation :
A power amplifier is used to amplify electric signals i.e. to increase the low power signal to higher powers.
A PNP transistor is connected in a circuit so that the collector-base junction remains reverse biased and the emitter-base junction is forward biased.
This transistor can be used as a power amplifier because it gives a much larger output current. The gain of an amplifier shows the amount of amplification. It is the difference between the input and the output signals.
