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Mice21
10 hours ago
3

A 39.1 kg woman wearing ice skates is standing on a skating rink next to a vertical wall. She pushes off against the wall and be

gins to slide along the perfectly horizontal surface of the rink. The coefficient of kinetic friction between the blades of her ice skates and the surface of the rink is 0.04. If she slides a distance of 14.8 m before stopping and her push against the wall lasted 0.2 s, what was the average force (in N) that she exerted on the wall?
Physics
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A wire has an electric field of 6.2 V/m and carries a current density of 2.4 x 108 A/m2. What is its resistivity
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Response:

The resistivity can be expressed as \rho = 2.5 *10^{-8} \ \Omega \cdot m

Clarification:

According to the information provided,

    The value of the electric field measures  E = 6.2 V/m

     The density of current is given as  J = 2.4 *10^{8} \ A/m^2

Typically, resistivity is represented in mathematical terms as

         \rho = \frac{E}{J}

by inserting values

        \rho = \frac{6.2}{2.4 *10^{8}}

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