2007-10-16 07:51:58 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Physics
By the way, it's 9 spheres not 8.
1st measurement on the balance is of any 3 spheres and any 3 spheres
If equal, then remove all spheres on the balance from the experiment. Of the remaining 3 spheres (the unmeasured ones), place 1 and 1 for the second and last measurement. If equal, then it heavier sphere is the unmeasured sphere, else the lower one on the balance.
Else if, the 1st measuement is not equal then remove the unmeasured 3 spheres and the 3 spheres on the high side of the balance from the experiment. Perform the second measure with the 3 spheres on the lower side of the balance in the same manner as the above paragraph.
2007-10-16 08:06:04 · answer #1 · answered by Xero Sinko 2 · 0⤊ 1⤋
8 Balls One Is Heavier
2017-01-15 04:08:13 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Step 1:
Choose 6 balls at random, and put 3 on each side of the balance.
Outcome 1.1: The balls balance. Go to Step 2a.
Outcome 1.2: The balls do not balance. Go to Step 2b.
Step 2a: Remove the 6 balls from the balance. Take the remaining 2 balls, and put one on each side of the balance. The side that goes down has the heavy ball.
Step 2b: Take the 3 balls from the side that went down; discard the other 5 balls. From the 3 balls you have left, select 2 at random and put 1 on each side of the balance.
Outcome 2b.1: The balls balance. This means the 3rd ball is the heavy ball.
Outcome 2b.2: The balls do not balance. The side that goes down has the heavy ball.
2007-10-16 08:04:26 · answer #3 · answered by RickB 7 · 3⤊ 0⤋
Put three on each side. If equal, then on of the remaining balls is heavier. Put one of each of the remaining on the scale. If one is heavier there you go, if equal the it is the last remaining ball.
If on the first test one side was heavier, then apply step two to those three.
2007-10-16 07:57:30 · answer #4 · answered by Tom . 2 · 1⤊ 0⤋
i don't know how to do it in just 2 steps. i know that you would divide the balls into 2 groups of four and weigh each group- the one that weighs more has the heavier ball in it. then you could divide that group into groups of 2 and weigh those separately, finding the group with the heaviest... repeat, weighing each one. but that's technically 3 steps.
?
2007-10-16 07:58:34 · answer #5 · answered by Anonymous · 0⤊ 1⤋