The electromagnet is a device that requires conducting wires wrapped around the iron core.
For making an electromagnet, the most necessary item is a copper wire.
What is an Electromagnet?
An electromagnet is a device that has conducting wires wrapped around an iron core. When electricity is passed through the wires, a magnetic field is generated. The setup acts as a strong magnet.
In order to make an electromagnet, a current-carrying wire is needed to wrap around a magnetic material. The current-carrying wires will play the role of conducting wires and the conducting wires are necessary to make an electromagnet. These wires can be made of copper.
Thus, we can conclude that for making an electromagnet, the most necessary item is a copper wire.
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D. you develop positive interactions with your peers
1) % = (Wo /Wi) * 100
Solve for Wo => Wo = (% / 100) * Wi
For example, % =30% and Wi = 250 => Wo = (30 /100) * 250 = 0.30 * 250 = 75
Wo = 75
2) % = (Wo / Wi) * 100
Solve for Wi
=> Wi = Wo * (%/100)
For example, Wo = 125 and % = 40%
=> Wi = 125 * (40 / 100) = 125 * 0.40 = 50
Wi = 50
If the billiard ball is going at the constant speed and contains its mass then the momentum WONT be changing. But realistically you have external forces like friction and air resistance changing the velocity thus changing the momentum. In this case momentum is not conserved because you're introduction an external force.
