Worksheet - Work & Power Problems
1. Work
A. Sample Problems:
1. F= 200 Newtons
d=50 meters
W =?
Formula:
Substitution:
Answer with unit of measure:
2. F= 5 Newtons
W = 75 Joules
D = ?
Formula:
Substitution:
Answer with unit of measure:
3. W= 125 Joules
d= 10 meters
F= ?
Formula:
Substitution:
Answer with unit of measure: _
4. If 150 Joules of work is needed to move a box 10 meters, what force was used?

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.