JonDihon

It was released three times. Which release was played the most?

He tapped the ball twice before it came to the floor.

Examples: very much admired, too much excited, so much fascinated.

What is the rule?

Where can I find a reference on the web?

They were German. They performed in the late 70's or early 80's. Part of their name translated into English was "shards", as in broken pottery or broken glass. Their style was sort of hard rock. Their lyrics contained social commentary. A German friend played them for me, but as I didn't understand them, I didn't follow them much. Now I would like to check them out again. Thanks

I have a fuel cell experiment kit. The instructions specify that distilled water must be use with it. I suspect this is because of mineral deposits that would build up with other water.

Here in Ireland it is difficult to find distilled water. The auto parts store supply de-ionized water. The pharmacy supply purified water. I can't find any one who sells distilled water. I don't want to ruin the fuel cell.

What is the weight of the space tourist?

This is a follow on question from two other questions.

http://answers.yahoo.com/question/index;_ylt=Ask8g...

http://answers.yahoo.com/question/index;_ylt=Au0v_...

A 100kg space tourist is in a space station that orbits the earth 200 km above the surface of the earth.

The space station is generally shaped as a cylinder with a radius of 30 m. It rotates about its axis once every minute.

A spring scales is placed on the inside surface of the space station wall. The tourist steps onto the scales. What is his weight? What is the reading on the scales?

His first night he falls out of his bunk bed that is 10 m above the "floor." How long does it take for him to hit the floor?

I borrowed this question from another source which I will reveal later.

It seems there was an apple tree owned by a certain king that had very sweet and very abundant fruit. Everyone would come from miles around to pick the fruit, so in order to protect the tree the owner erected a series of seven fences around the tree. Concentric, circular fences. Each fence had a gate with a guard. So to get to the tree, a person had to pass through seven gates guarded by seven guards. Practically impossible. One day a man approaches the guard at the outermost gate and says, "If you let me pass through, when I come back I will give you half the apples I have. But then you must give me one back." The guard agrees and lets the man go through the gate.

The question is: How many apples did the man have to collect to pass back through the seven gates, giving half of his stash to each guard, and the guard giving one back? Of course, you can't cut any mangoes in half...that would be cheating...

What is the minimum number of apples?

What is the next smallest number of apples?

Given the man comes away with m apples, write an expression for the number, n, apples he must collect from the tree.

Given that there are f fences, not 7, and the man comes away with m apples, write an expression for the number of apples that he must collect.

I'll be out of town for a few days and might not be able to respond to this question quickly after today.

Happy Holidays, everyone.

Out of a group of 275 YA! participants:

90 answer math questions,

70 answer chemistry questions,

10 answer math and biology questions,

8 answer biology and physics questions,

5 answer math, biology and chemistry questions,

3 answer math, chemistry and physics questions,

1 answer questions from all four categories,

80 answer biology questions,

60 answer physics questions,

9 answer math and chemistry question,

7 answer chemistry and physics questions,

4 answer math, biology and physics questions,

2 answer biology, chemistry and physics questions,

How many answer no questions in these categories?

Can this question be answered?:

"How many answer only math questions?"

If yes, then how many?

If no, then why not?

Out of a group of 99 YA! participants:

59 answer math questions,

61 answer chemistry questions,

44 answer math and chemistry questions,

1 answers math, physics and chemistry questions,

22 answer physics questions,

7 answer math and physics questions,

4 answer physics and chemistry questions.

1) How many answer questions in only one of the categories, chemistry, physics, math?

2) How many answer no questions in these categories?

Considering only the revolution of the Earth and the moon around their common center of mass;

what is the ratio of the kinetic energies of the moon and the Earth?

If you like use Me for the mass of the Earth, Mm for the mass of the moon and R for the distance between their centers.

I have adapted this from another question and have given an incorrect solution below.

http://answers.yahoo.com/question/index;_ylt=At7Oi...

Can you find the mistake?

Two masses are connected at either end of a light spring. One mass has twice the mass of the other. The masses are pulled apart, stretching the spring and then released. They oscillate on a horizontal frictionless surface with the lighter mass moving back and forth 1cm. How far does the heavier mass move?

Solution (incorrect):

The amplitude of the motion of the lighter mass is 0.5 cm, half its total displacement.

Let k be the spring constant of the spring and x be the amplitude of the heavier mass.

(1) The maximum spring energy of the lighter mass is (1/2)k(0.5)^2.

At the time when the spring is at its natural length both masses will have their maximum speed.

By then equal but opposite impulses have acted on them so their momentums will be equal and opposite.

So the speed of the heavier mass will be 1/2 the speed of the the lighter mass and the kinetic energy of the heavier mass will be 1/2 the kinetic energy of the the lighter mass. At full extension the spring energy of the heavier mass is 1/2 of the spring energy of the lighter mass.

(2) (1/2)k(x)^2 =(1/2) (1/2)k(0.5)^2

(3) (x)^2 =(1/2) (0.5)^2

(4) x = 0.5*sqrt(1/2)

Why is this wrong? What should it be?

Bonus question: Why does YA! insist that this is a chemistry question?

A boat can cross a river in two minutes. It takes four minutes for it to go the same distance (the width of the river) up the river. The river is flowing at a rate of 3 m/s.

How wide is the river?

How long does it take for it to go the same distance down the river?

I have invented a new game and want to patent it.

There are several ways to embody this game, so in claim 1 I completely describe the concept but give no concrete manifestation of it.

In claim 2 I list several concrete embodiments.

Is this correct or do I need to put one concrete embodiment in the first independent claim?

(I asked this before in another category, but haven't received any response yet. Apologies to those who get this question twice.)

I have invented a new game and want to patent it.

There are several ways to embody this game, so in claim 1 I completely describe the concept but give no concrete manifestation of it.

In claim 2 I list several concrete embodiments.

Is this correct or do I need to put one concrete embodiment in the first independent claim?

315 points last week.

77% best answers.

There are 27 slots into which go 9 identical balls.

There are 27!/(18!*9!) = 4686825 ways to fit the balls into the slots.

Number the slots 1 to 27 (or any other numbers you prefer.)

Let n1, n2, n3,...n9 be the numbers of the occupied slots and n1 < n2 < n3 < ... < n9.

Make a formula or routine using the numbers of the 9 occupied slots so that each combination has a unique identifying number from 1 to 4686825 (or 0 to 4686824 if you like.)

Preferably the combination with the balls in the first nine slots on the left has number 1 and the combination with the balls in the nine slots on the right is identified by number 4686825.

If you make a routine, it should be one with which the number can be calculated quickly, and not by counting all the combinations up to that position.

In previous questions we found that the last digit of a Fibonacci sequence repeated after a certain number of terms.

http://answers.yahoo.com/question/index?qid=200808...

http://answers.yahoo.com/question/index;_ylt=AshI9...

The numbers of terms before a repetition depended on the starting two numbers. lavalamp3773 found that it repeated after 12 terms when the starting numbers are 1 and 3. manjyome found this and several other starting pairs give a period of 12. lavalamp3773 found starting pairs with a period of 1 and another with a period of 3. Falcor84 also found a sequence with period 3. farful found a sequence with a period of 60.

http://answers.yahoo.com/question/index;_ylt=AqC2g...

Let FP(i,j) be a function of the starting numbers i, j of a Fibonacci sequence where FP(i,j) is the period of the sequence mod 10.

i and j are the integers from 0 to 9.

Can anyone make a formula using i and j that gives FP(i,j), or can anyone give a verbal description?

In a previous question it was determined that only 1, 3, 7 and 9 could be the last digit in two consecutive Fibonacci numbers.

http://answers.yahoo.com/question/index;_ylt=AshI9...

It was assumed that the first two numbers were 1, 1 (or 0, 1).

More generally any sequence where the nth term is the sum of the previous terms is a Fibonacci sequence. The first two numbers can be any integer.

Name a starting pair for each numeral to be the last digit in two consecutive Fibonacci numbers. (No one pair can produce all numerals as last digit in two consecutive Fibonacci numbers.)

A good answer will tell all the numerals to fit the condition for that starting pair and why the other numerals are not the last digit in two consecutive Fibonacci numbers for that starting pair.

Bonus question: Find a starting pair that produce no numeral as the last digit in two consecutive Fibonacci numbers. Tell why.