An excellent typist is given a new computer with a keyboard that has the keys arranged on the basis of how frequently the letters are used, as opposed to the standard keyboard arrangement. until the typist learns this new keyboard, his familiarity with the standard keyboard will result in his being plagued by?

According it will plague only.

Explanation:

End of the typist is going to try tying only in standard keyboard which is connected to computer.

By arranges nonstandard keyboard the typist try practice in nonstandard keyboard she or he will be familiar or nonstandard keyboard and once she or he come across standard keyboard .she or he will type wrongly and life will miserable. Better practice is to use standard key board as good practice.

I don’t see any nonstandard keyboard is available in the markets.

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.