(1) Arectangularmetal block with mass 18 kg has
dimensions 0.1 m X0.15 m 0.2 m. Calculate the volume
of the block and thus density?

Volume=0.003m^3 density=6000kg/m^3

Explanation:

mass=18kg

volume=length x width x height

Volume of block=0.1x0.15x0.2

volume of block=0.003m^3

Density=mass ➗ volume

Density=18 ➗ 0.003

Density=6000kg/m^3

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the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it