Answers.com > Wiki Answers > Categories > Science > Physics > If you have 7 tennis balls 1 is heavier than the others and a balance How do you find which one is the heaviest only using the balance twice?

If you have 7 tennis balls 1 is heavier than the others and a balance How do you find which one is the heaviest only using the balance twice?

In: Physics, Weight and Mass [Edit categories]

Answer:

1- Take ou one ball and slit the other six into two groups of three balls

2- put the two groups in the balance ( first use ) and if they are the same weight then the ball you took out in the first place is the heavier if not and one group is heavier than the other then the heavier ball is in that group so you can exclude the other group and the ball you took out at first.

3- If one group is heavier than the other then you take one ball from that group ( it has 3 balss remember? ) and you weight the other two remaining balls ( second and last use of the balance ) if the two balls have the same weight then the ball you took out is the heavier one if not look to the balance to see which of the balls is lower and there is your answer.

Please, tell me if you understood : )

First answer by ID1507228259. Last edit by ID1507228259. Question popularity: 1 [recommend question].

[report abuse]

Can you answer these Physics questions?

	What process do stars use to produce energy?	Answer it!
	What is the equation for determining acceleration?	Answer it!
	What type of telescope uses mirrors to focus light?	Answer it!
	What is the variable that must be controlled in order to determine the specific heat capacity of a substance?	Answer it!
	What is the diagnostic procedure to determine the density of a body part by the sound produced by tapping the surface with the fingers?	Answer it!

Relevant answers:

How do you find the lighter ball by using the balance only twice How do you do it?
First balance Divide the balls into three groups of three. Put two groups on the balance, three balls per side. If they balance, the lighter ball in the third group. If one group is lighter (that...
If you have 9 balls and one is heavier than the rest how to pinpoint the heavy one by using?
1 - Split the balls into three groups of three balls each. 2 - First use of the scale: Weigh any two groups against each other.3 - If the groups weigh the same then the heavier ball is in the third...
Can you balance with only one ear?
Yes
Is a tennis ball heavier than one kilogram?
No - a standard tennis ball weighs between 56 grams and 59.4 grams.
Why is one of your balls biger than the other?
If this has always been how they are, it's just how you are built. They don't have to be a matched set. If one has increased in size it should be looked at ASAP to rule out cancer.