Mathematical and Physical Journal
for High Schools
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Problem P. 4725. (April 2015)

P. 4725. The diameter of a standard table-tennis ball is 40 mm, and its mass is 2.7 grams. What is the diameter of that iron ball, which should be attached to the table-tennis ball, in order that they just float in the water?

(3 pont)

Deadline expired on May 11, 2015.


68 students sent a solution.
3 points:55 students.
2 points:6 students.
1 point:6 students.
0 point:1 student.

Problems in Physics of KöMaL, April 2015