When developing an experimental design, which action would improve the quality of the results?
A. Have a different researcher make the measurements.
B. Ensure that it answers a question about cause and effect.
O
C. Include as many responding variables as possible.
D. Keep the sample size of test subjects to a minimum.

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.

If forces acting on an object are unbalanced. true or false

In an experiment, how can i change human errors? be specific.