Calculate the current density needed to `levitate' a copper wire in the earth's magnetic field (that is, the current required for the lorentz force on the wire to be equal to its weight). assume that the wire is at the magnetic equator where the field is horizontal with magnitude 10-4 tesla. take the density of copper to be 8.9 g cm3 .
(b) calculate the power dissipated in the wire per unit volume. will the wire become hot? the resistivity of copper is 1.7 x 108 ω.m and the heat capacity of copper is 385 j kg-1 k -1 .
i have part (a) i just need part (b)
answer to part (a) is j=8.73x10^8 a/m^2.

it is true because as we rotate around the way we rotate makes day come and because the moon is rotating around the earth that's what makes it night come. hope this .

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

both the fifth and fourteenth amendments of the united states contain a due process clause. while the fifth amendment describes a legal obligation of the federal government to not deprived of life, liberty or property without due process of law, the fourteenth amendment applies the same obligation to the states to guarantee that all of the states provide fair procedures as well.

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explanation: