It is easier to chop with a sharp knife then with a blunt one

Explanation:

The pressure exerted by the sharp knife edge is more than that exerted by the blunt one because the area on which force is exerted with a sharp knife is very small. Thus, it is easier to cut with the former than with the latter.

hope it helps

1/0.14nm = 10^10/1.4 a lot

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )