A10-m-long wire with a diameter of 0.80 mm has a resistance of 1.1ω. of what material is the wire made?
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Ответ:
and so the cross-sectional area of the wire is
The relationship between the resistance of the wire R, its length L, its cross-sectional area A and the resistivity of the material
So by using the data of the problem we find the resistivity of the material:
And by looking at the table of the resistivities for different materials, we find that this value corresponds to tungsten, so the wire is made of tungsten.
Ответ:
Brielle will run the marathon faster.
Brielle = 104.8 minutes
Joshua = 157.2 minutes
Step-by-step explanation:
Speed rate = distance /time
Brielle = 1.25 /10 = 0.125 miles per minute
Joshua = 1.5/18 = 0.083333 =1/12 miles per minute
Since 0.125 (Brielle) > 1/12 (Joshua)
Brielle will run the marathon faster.
To calculate the time that takes each one to run the entire race (13.1 miles)
Time= distance / speed
Brielle = 13.1 /0.125 = 104.8 minutes Joshua = 13.1 / (1/12)= 157.2 minutesFeel free to ask for more if needed or if you did not understand something.