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 precision of a laboratory instrument is ± 0.05 g. the accepted value for your measurement is 7.92 g. which measurements are in the accepted range? check all that apply. 7.85 g 7.89 g 7.91 g 7.97 g 7.99 g

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.

A14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.