If you make an electromagnet using a battery circuit and a steel nail, how can you increase its magnetic strength?

a.
replace the nail with a copper rod

b.
wrap more coils of wire around the nail

c.
use a longer nail

d.
remove the plastic insulation from the wire coil

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .