There is a close relationship between magnetic forces and the generation of electric current. Explain how magnets can be used to
1 answer:
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Answer:
245.45km in a direction 21.45° west of north from city A
Explanation:
Let's place the origin of a coordinate system at city A.
The final position of the airplane is given by:
rf = ra + rb + rc where ra, rb and rc are the vectors of the relative displacements the airplane has made. If we separate this equation into its x and y coordinates:
rfX = raX+ rbX + rcX = 175*cos(30)-150*sin(20)-190 = -89.75km
rfY = raY + rbY + rcT = 175*sin(30)+150*cos(20) = 228.45km
The module of this position is:
And the angle measure from the y-axis is:
So the answer is 245.45km in a direction 21.45° west of north from city A
a) The charge on the outer surface is
b) The number of ions is
Explanation:
a)
The membrane behaves as a parallel plate capacitor, whose capacity is given by the equation
where
k = 4.3 is the dielectric constant
is the vacuum permittivity
is the surface area
is the distance between the two plates
Substituting,
The capacity of the membrane is related to the potential difference between the two surfaces by
where here we have
Q = excess charge on one surface
is the potential difference between the two surfaces
Solving for Q, we find
b)
We said that the net charge on the outer surface is
The charge of one K+ ions is equal to the electron charge
Therefore, the number of ions on the outer surface can be found by dividing the total charge by the charge of a single ion:
Learn more about capacity:
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