Two bullies want to get you. The three of you are on a narrow path that you can't get off. And ... you're in the middle. They're separated by 300 meters when they start running toward you. They each run at 6 m/s, but you can
run at 10 m/s. If you initially start out right in front of one of them and run back and forth the full distance between
bullies, how much distance will you have covered by the time they finally catch you?
m.
730
300
0 +

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.

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination. at the turning point, how far is the second student from the destination?

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?