If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two hour long movie.
Question 1 options:
1) 1400
2) 25 000
3) 50 000
4) 170 000
5) This cannot be determined without knowing how many reels were used.

Question

If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two hour long movie.
Question 1 options:
	1)	1400
	2)	25 000
	3)	50 000
	4)	170 000
	5)	This cannot be determined without knowing how many reels were used.

anonymous · Answer

and I don't see why the height on the film is relevant

anonymous · Answer

24 frame per second X

3600 seconds per hour X

2 hoursX =  172800

anonymous · Answer

which is close to last choice

anonymous · Answer

Ok, so why did they tell the height in there?

anonymous · Answer

height is extraneous information , I believe

anonymous · Answer

Ah, do they do that a lot in physics? Because I was trying forever to figure out why that was in there

anonymous · Answer

yes,

anonymous · Answer

Mk, thanks man

jamesj · Answer

They (we!) do it for a good reason.  One of the important things to figure in science is what  is information is germane to the problem, what information is relevant.  

For what it's worth, this is also very true in business, so it's good training for the life in the real world, as well as being good science.