Doug Miller wrote:

In article , Carla Fong wrote:

94% here (also messed up the worm gears)


Well, I got a 90%, (also got messed up on worm gears) but I think
there's room to quibble on two others.

#15 presumes a frictionless pulley - I live in the real world and know
that a straight lift with no pulley requires the least force.

#31 has no correct answer stated. The correct answer is 60 since the
actual mechanical ratio for the lever is 5:1.

I had the same problems with poorly written questions in college. My
professors did not seem amused...


And also #24, which they describe as a parallel circuit. Sure, the two lamps
are in parallel -- but they're in series with the switch...


Switches are not considered as part of the circuit for series/parallel
determination.

Jim Chandler