Lamina a lamina of arbitrary shape rotates freely under zero torque. (a) use euler's equations to show that the sum is constant if the 1, 2 plane is the plane of the lamina. (this means that the projection of w on the plane of the lamina is constant in magnitude) (b) what kind of lamina gives us = constant as well?

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a and c

c is 100% but i am confused in a

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

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.