broyochey1
05.02.2020 •
Physics
What would be the resistivity of a perfect conductor in ohm-meters?
0
1
100
infinity
a current of 3.50 a flows through the leads of an electric appliance. how long does it take for 6.50 c of charge to pass through the leads?
1.8 s
22.8 s
0.5 s
10 s
Solved
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Ответ:
The resistance of a perfect conductor is 0 Ohm, so the resistivity is necessarily also 0 (Ohm.meter). Resistivity = Resistance * (length)/(cross-section area).
Use the current-charge-time formula:
Current = (amount of charge) / (time) = 6.5C / t = 3.5A
so t=6.5C/3.5A = 1.86 seconds
The closest answer choice is 1.8s (but it really should have been 1.9s)
Ответ:
Two chemicals react in an endothermic reaction. What can be known about this reaction? The new substance will need more energy to form its chemical bonds than the old substance will release. ... More energy will be released from the old substance than the new substance will need to form its chemical bonds.