2 years ago

Aude slipped on ice going 7.6 m/s .What was her velocity before she hit the wal?

Physics

1 answer:

Mkey [24]2 years ago

6 0

Answer:

Define universal gravitational constant. Why is newton's law of gravitation called universal law?

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3 years ago

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3 years ago

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3 years ago

The electric field at the center of a ring of charge is zero. At very large distances from the center of the ring along the ring

Daniel [21]

Answer:

z = 1.16m

Explanation:

The electric field in a point of the axis of a charged ring, and perpendicular to the plane of the ring is given by:

$E_z=\frac{Qz}{(z^2+r^2)^{\frac{3}{2}}}$

z: distance to the plane of the ring

r: radius of the ring

Q: charge of the ring

you have that:

E_{z->0} = 0

E_{z->∞} = 0

To find the value of z that maximizes E you use the derivative respect to z, and equals it to zero:

$\frac{dE_z}{dz}=Q[\frac{1}{(z^2+r^2)^{3/2}}+z(-\frac{3}{2})\frac{1}{(z^2+r^2)^{5/2}}(2z)]=0\\\\(z^2+r^2)^{5/2}=3z^2(z^2+r^2)^{3/2}\\\\(z^2+r^2)^2=3z^4\\\\z^4+2z^2r^2+r^4=3z^4\\\\2z^4-2z^2r^2-r^4=0\\\\z^2_{1,2}=\frac{-(-2)+-\sqrt{4-4(2)(-1)}}{2(2)}=\frac{2\pm 3.464}{4}\\\\$

you take the positive value:

$z^2=\frac{2+3.464}{4}=1.366\\\\z=1.16m$

hence, the distance in which the magnitude if the electric field is maximum is 1.16m

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3 years ago

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Water enters the atmosphere through evaporation, transpiration, excretion and sublimation: Transpiration is the loss of water from plant

Hope this helped you! :D

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