a wooden box of dimensions 50cm x 30cm x 20cm is kept on the ground of the mass of the box is 30 kg find the pressure exerted by the box on the ground ​

1 pa

explanation :

pressure = volume ÷ mass

50×30×20 = 30000 = 30m

30m ÷ 30kg = 1

units for pressure = pascals

so pressure = 1 pa

0.2pascal

Explanation:

when the box is on the ground,

Then Force= weight

F=mg, which is

F= 30*10=300N

and also the area

Area= 50*30=1500cm^2

Therefore

Pressure =Force / Area

Pressure = 300/1500 = 3/15 =0.2pascal

not really sure but thinking 1.54 mm/us

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