The diameter of a new piston is 4.644 in. The average wear per 10,000 mi is 0.009 in. uniformly over the piston. Find the average diameter of the piston after 100,000 mi.
A) 6.209 in.
B) 4.59 in.
C) 4.554 in.
D) 4.464 in.
E) 2.097 in.

Question

Quizplus · Accepted Answer

The diameter of the piston after 100,000 miles can be found by subtracting the total wear from the original diameter.

Total wear = (wear per 10,000 miles) x (number of 10,000 mile intervals)
Total wear = 0.009 in. x 10
Total wear = 0.09 in.

New diameter = original diameter - total wear
New diameter = 4.644 in. - 0.09 in.
New diameter = 4.554 in.

Therefore, the average diameter of the piston after 100,000 miles is 4.554 in., which is answer choice D.

The Diameter of a New Piston Is 4