3) Nm is unit of torque derived by Force x distance, force is mass x acceleration so in base units Nm = kgm^2s^-2, nm is a nanometre, mN is a millinewton and MN is meganewton. 4) It is asking for number density so think of it as number of electrons per volume, since number of electrons has no units the base unit for it would just be m^-1. Hope this helps.
3) Nm is unit of torque derived by Force x distance, force is mass x acceleration so in base units Nm = kgm^2s^-2, nm is a nanometre, mN is a millinewton and MN is meganewton. 4) It is asking for number density so think of it as number of electrons per volume, since number of electrons has no units the base unit for it would just be m^-1. Hope this helps.
thanks, but it should be m^-3 as it says density, no?
3) Nm is unit of torque derived by Force x distance, force is mass x acceleration so in base units Nm = kgm^2s^-2, nm is a nanometre, mN is a millinewton and MN is meganewton. 4) It is asking for number density so think of it as number of electrons per volume, since number of electrons has no units the base unit for it would just be m^-1. Hope this helps.