Electricians should use ladders made of fiberglass rather than metal, because metal ladders
a. conduct electricity.
b. can't be painted.
c. can magnetize an electrician's tools.
d. will mar the surface finish of electrical unit covers.

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 .