Dimensional formula of current density
2 answers:
<em>The Dimensional Formula is ![[M ^{-2} A]](https://tex.z-dn.net/?f=%5BM%20%5E%7B-2%7D%20A%5D)
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When we are talking about current density, we are referring to "Ampere per unit area", so the unit we would use is
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When we are talking about current density, we are referring to "Ampere per unit area", so the unit we would use is
Thank you for your question! I hope this helped! Have an amazing rest of your week and feel free to let me know if you need any further help with anything! :D
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a) Let's call x the direction parallel to the river and y the direction perpendicular to the river.
Dave's velocity of 4.0 m/s corresponds to the velocity along y (across the river), while 6.0 m/s corresponds to the velocity of the boat along x. Therefore, the drection of Dave's boat is given by:
relative to the direction of the river.
b) The distance Dave has to travel it S=360 m, along the y direction. Since the velocity along y is constant (4.0 m/s), this is a uniform motion, so the time taken to cross the river is given by
c) The boat takes 90 s in total to cross the river. The displacement along the y-direction, during this time, is 360 m. The displacement along the x-direction is
so, Dave's landing point is 540 m downstream.
d) If there were no current, Dave would still take 90 seconds to cross the river, because its velocity on the y-axis (4.0 m/s) does not change, so the problem would be solved exactly as done at point b).