Answered

Get the answers you need at Westonci.ca, where our expert community is always ready to help with accurate information. Join our Q&A platform to connect with experts dedicated to providing precise answers to your questions in different areas. Connect with a community of professionals ready to provide precise solutions to your questions quickly and accurately.

Assuming a mass of 0.04 g, what is the power exerted by the electrical forces on a fragment of fiber if the fragment has a velocity of 200 mm/s, 10 ms after ejection? For this problem, I used the formula P= Force * velocity = mass* (velocity/time)*velocity = (mass * velocity^2) /time. However I got the problem wrong. In the answer, they used the formula P= W/t = 1/2* (mass*velocity^2)/time. I am confused.When do you use P = Force * velocity = (mass * velocity^2) /time and when do you use P= W/t = 1/2* (mass*velocity^2)/time?

Sagot :

mickymike92

The power exerted by the electrical forces on a fragment of fiber is 8.0× 10^-5 Watts

Power and Energy or Work done

Power is the rate of doing work.

  • Power = work done / time

Energy is the ability to do work.

Work done and energy are used interchangeably.

  • Work done = Force × distance

In the example above, the energy possessed by the mass is kinetic energy.

Kinetic energy is the energy a body has by virtue of its motion.

  • Kinetic energy, KE = 1/2 mv^2

Calculating kinetic energy of the body:

mass of the body = 0.04 g = 4.0 × 10^-5 kg

velocity of the body = 200mm/s = 0.2 m/s

Kinetic energy of the body = 1/2 × 4.0 × 10^-5 × 0.2^2

Kinetic energy of the body = 8.0× 10^-7

Thus, work done = 8.0× 10^-7 J

Calculating power exerted:

time taken = 10 ms = 0.01 s

Power = work done/ time

Power exerted = 8.0× 10^-7/0.01

Power exerted = 8.0× 10^-5 Watts

Therefore, the power exerted by the electrical forces on a fragment of fiber is 8.0× 10^-5 Watts

Learn more about about electrical energy and power at: https://brainly.com/question/60890

Thank you for visiting. Our goal is to provide the most accurate answers for all your informational needs. Come back soon. Thanks for using our platform. We aim to provide accurate and up-to-date answers to all your queries. Come back soon. Westonci.ca is here to provide the answers you seek. Return often for more expert solutions.