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## Quiz of the Month (June 2002)

### Hector C. Parr

***

#### SOLUTION TO LAST MONTH'S QUIZ

```   1.  7
2.  5
3.  4```

Notes
```  1. The following seven weights are sufficient:
1, 2, 4, 8, 16, 32, 64.
For example, to weigh 77 g,
77 = 64 + 8 + 4 + 1

2. The following five weights are sufficient:
1, 3, 9, 27, 81.
For example, to weigh 52 g,
52 = 81 - 27 - 3 + 1

3. At his first move A leaves 496 counters.
Then whatever B removes, at his next move A can leave 485.
Then whatever B removes, at his next move A can leave 474.
(And so on, coming down in steps of 11)
...
At his final move A leaves 1 counter, forcing B to lose.```

#### THIS MONTH'S QUIZ

1. The wheel of a locomotive (excluding the flange) has diameter 2 m, and the width of the flange is 5 cm. When the locomotive is travelling at 100 km/hr, what is the speed relative to the track, and the direction of motion, of:
```      (a) the highest point, A, of the flange, and
(b) the lowest point, B, of the flange ?```

2. A ship's propeller shaft is turning at one revolution per second. It is supported in a roller bearing, with cylindrical rollers. The inner race has diameter 20 cm and the rollers each have diameter 2 cm. How long does a roller take to make one revolution and return to its original position ?

3. In question 3, if the inner race were fixed and the outer race were turning at one revolution per second, how long would a roller take to make one revolution ?

***

(c) Hector C. Parr (2002)

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