A133.7 ft3 volume of liquid hydrogen rocket fuel has a mass of 268 kg. calculate: the weight of the fuel at standard (earth) sea level conditions in n and ibr, the density of the fuel in kg/m3, and the specific volume in ft3/lbm (ibm=pound-mass, which is not the same as a a lbf or a slug)

First, let's make some convertions:

a) weight of the fuel:

Newtons: The weight in newtons is equal to the mass in kilograms times the gravity in m/s^2.

lbf: The weight inlbf is equal to the mass in slugs times the gravity in ft/s^2.

b) density:

The density is the mass in kg of the fuel divided by its volume in m^3:

c) specific volume:

The specific volume is the volume in ft^3 of the fuel divided by its mass in lbm:

the higher the current the higher the mag field around it the higher the influence on the compass

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach