The Flintstones and Rubbles decide to try out the new inclined bowling alley, ``

Question

The Flintstones and Rubbles decide to try out the new inclined bowling alley, ``Bedslant Bowling''. Wilma's ball and Fred's ball have the same size, but Fred's ball is hollow. Betty's ball and Barney's ball are scaled down versions of Wilma's ball and Fred's ball respectively. They all place their bowling balls on the same pitch incline and release them from rest at the same time.

The time it takes for Fred's ball to hit the pins is .... that for Betty's ball to hit.

The time it takes for Fred's ball to hit the pins is .... that for Barney's ball to hit.

The time it takes for Betty's ball to hit the pins is .... that for Barney's ball to hit.

The time it takes for Wilma's ball to hit the pins is .... that for Betty's ball to hit.

The time it takes for Fred's ball to hit the pins is .... that for Wilma's ball to hit.

The time it takes for Wilma's ball to hit the pins is .... that for Barney's ball to hit.

Explanation / Answer

Assuming the girl's balls are not *hugely* different in size from the boy's balls (so to speak), then Barney's ball will be the heaviest as it is the biggest AND is filled

Wilma's ball is next heaviest, it is not the biggest, but it is filled

Fred's ball is next, being biggest but hollow

Betty's ball is last, being both the smallest and hollow

Note if Wilma's ball is very very small, then Fred's ball might be slightly heavier, but we assume this is not the case.

They're all acted on by the same forces (same friction, same gravity, etc) and they all start at the same speed (from rest), so there are no extra factors to consider. Thus we'd expect the balls speed to be ordered from fastest to slowest as: Barney, Wilma, Fred, Betty

Time is, of course, related to the speed. The faster it gets there, the less time it takes.

so your answers are:

1 C

2 A

3 C

4 A

5 A

6 A

Note it can't be answer B - the balls are all different.

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