Forces - Challenge Questions 1. Tyler and Cole are trying to pull a log out of the river (See picture below). Tyler pulls
with a 12.0 N force at a 10.0 angle while Cole pulls with a 8.0 N force at a 120°
angle. What is the net force on the log? (Remember: force is a vector that requires
magnitude and direction).

What is the most useful equation for electric power?

Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.

What can you increase the strength of an electromagnet by