A magnetic wave and electrical current moving in opposite directions
Explanation:
The attraction of the metallic objects is caused by the magnetic fields produced by the perpendicular vibration of magnetic waves and electric current moving in opposite directions.
- This vibrations causes the formation of magnetic fields.
- Such a device is called an electromaget
- It is a magnet that is produce when electric current produces magnetic fields.
- In the vicinity of magnetic objects, it will attract it.
- the construction worker is using an electrmagnet.
learn more:
Electromagnet brainly.com/question/2191993
#learnwithBrainly
Answer:
433.15K
Explanation:
(320°F − 32) × 5/9 + 273.15 = 433.15K
Consider that I'm an italian student so I may unproperly use some terms.
Being Ug (Potential energy on earth) = m·g·h
Where "m" in this case is the mass of the ball, "g" the average value of gravitation constant on Earth's surface and "h" the height reached by the ball.
The solution to the first question would be : Ug = mgh = 40[kg] · 10 [m/s²] · 5[m] = 2000 [Joule]
In order to find the value of its K (kinetic energy) and without considering air resistance, you can use the concept of mechanical conservation of energy that confirms : U(start) + K(start) = U(final) + K(final).
So since you want to find its K(final) you can isolate it in the law and it gives you:
K(final) = U(start) + K(start) - U(final)
Consider that in halfway fall its Ug(final) value is mgh = 40[kg] · 10[m/s²] · 2.5[m] = 1000[Joule]
Now you just need to change these elements into their values(consider that K(start) is 0:
K(final) = 2000[Joule] + 0[Joule] - 1000[Joule] = 1000[J]
Hope I explained it well.
Answer:
Angular momentum is conserved if there are no external forces
P1 = P2
I1 ω1 = I2 ω2
ω2 / ω1 = I1 / I2
If the skater pulls their arms in (I2 < I1) then the angular speed must increase for angular momentum to be conserved.
I upload the answer via Image because Brainly warned me that there were inappropriate links or words.