A half litre bottle has a mass of 80 g. It contains 500 cm of liquid when full. The bottle is filled with olive oil of
density = 0.90g/cm

Calculate the mass of oil in the bottle.
Calculate the mass of the full bottle

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

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

answer(20) psi;