Could you pass a Cambridge University interview?

[scooterscot]

I took question 2 as bollocks frankly as none of the options were valid.

I had similar thoughts toward that question.

[scooterscot]

Alright, I have never pretended to be clever - I got the others but could someone explain the balloon one to me?

Air pressure behind the ballon increases due to the accelerating wall of the truck?

[doodab]

Alright, I have never pretended to be clever - I got the others but could someone explain the balloon one to me?

In a vacuum, the balloon would lean backwards, but it's not in a vacuum, there is air in the truck, and when the air moves backwards it pushes the balloon forwards.

I had to google to find that out

[MyUserName]

Air pressure behind the ballon increases due to the accelerating wall of the truck?

In a vacuum, the balloon would lean backwards, but it's not in a vacuum, there is air in the truck, and when the air moves backwards it pushes the balloon forwards.

Ah, yes I see. Thanks.

[ASB]

The answer to the first question is wrong too.

[doodab]

The answer to the first question is wrong too.

Really?

[MyUserName]

The answer to the first question is wrong too.

Mine wasn't!

[hyperD]

Got 50% - the balloon one got me too - thanks for the explanation doodab.

Got the plane one right using d = 1.22 * SQRT(h) which I remembered but I had to use a calculator and guess closest and convert (d) miles to feet.

[OwlHoot]

Alright, I have never pretended to be clever - I got the others but could someone explain the balloon one to me?

Imagine the air was water, which would all want to slosh to the back, making the balloon "float" to the front, as the truck lurched forward

[original PM]

I got q7 wrong - (and many others) but this one puzzled me.

As the only possible solution to let anyone know their hat colour would be that the prisoner at the back can see 2 red hats and thus knows his hat is green

as he said nothing then the person at the front can only assume that he is seeing a red hat and a green hat or two green hats

but either way he cannot know if his hat is green or red?

pretty sure the guy in the middle adds nothing to this apart from wearing a red or green hat!

why am I so dim?

and what is the logical answer?